- Standard Number: 1926.55 App A
- Standard Title: Gases, vapors, fumes, dusts, and mists.
- SubPart Number: D
- SubPart Title: Occupational Health and Environmental Controls
- Applicable Standard: 1910.16
- Applicable Standard: 1910.161(a)(2
- Applicable Standard: 1910.16
NOTE: Because of the length of the table, explanatory
Footnotes applicable to all substances are given below as well as at the end of the
table.
Footnotes specific only to a limited number of substances are also shown within the table.
Footnote(1) [Reserved]
Footnote(2) See Mineral Dusts Table.
Footnote(3) Use Asbestos Limit 1926.58.
Footnote(4) See 1926.58
Footnote(*) The PELs are 8-hour TWAs unless otherwise noted; a (C)
designation denotes a ceiling limit.
Footnote(**) As determined from breathing-zone air samples.
Footnote(a) Parts of vapor or gas per million parts of contaminated
air by volume at 25 degrees C and 760 torr.
Footnote(b) Milligrams of substance per cubic meter of air. When
entry is in this column only, the value is exact; when listed with a
ppm entry, it is approximate.
Footnote(c) [Reserved]
Footnote(d) The CAS number is for information only. Enforcement is
based on the substance name. For an entry covering more than one
metal compound, measured as the metal, the CAS number for the metal
is given - not CAS numbers for the individual compounds.
Footnote(e) [Reserved]
Footnote(f) [Reserved]
Footnote(g) For sectors excluded from 1926.1128 the limit is 10 ppm
TWA.
Footnote(h) [Removed]
Footnote(i) [Reserved]
Footnote(j) Millions of particles per cubic foot of air, based on
impinger samples counted by light-field techniques.
Footnote(k) The percentage of crystalline silica in the formula is
the amount determined from airborne samples, except in those
instances in which other methods have been shown to be applicable.
Footnote(l) [Reserved]
Footnote(m) Covers all organic and inorganic particulates not
otherwise regulated. Same as Particulates Not Otherwise Regulated.
The 1970 TLV uses letter designations instead of a numerical value
as follows:
Footnote(A(1)) [Reserved]
Footnote(A(2)) Polytetrafluoroethylene decomposition products.
Because these products decompose in part by hydrolysis in alkaline
solution, they can be quantitatively determined in air as fluoride to
provide an index of exposure. No TLV is recommended pending
determination of the toxicity of the products, but air concentrations
should be minimal.
Footnote(A(3)) Gasoline and/or Petroleum
distillates. The composition of these materials varies gratly and
thus a single TLV for all types of these materials is no longer
applicable. The content of benzene, other aromatics and additives
should be determined to arrive at the appropriate TLV.
Footnote(E) Simple asphyxiants. The limiting factor is the
available oxygen which shall be at least 19.5 percent and be within
the requirements addressing explosion in part 1926.
THRESHOLD LIMIT VALUES OF AIRBORNE
CONTAMINANTS FOR CONSTRUCTION
_______________________________________________________________
| | |
| | |
Substance | CAS No. (d) | ppm (a) |
______________________________________|_____________|__________|
| | |
Abate; see Temephos...................| | |
Acetaldehyde..........................| 75-07-0 | 200 |
Acetic acid...........................| 64-19-7 | 10 |
Acetic anhydride......................| 108-24-7 | 5 |
Acetone...............................| 67-64-1 | 1000 |
Acetonitrile..........................| 75-05-8 | 40 |
2-Acetylaminofluorene; see 1926.1114..| 53-96-3 | |
Acetylene.............................| 74-86-2 | E |
Acetylene dichloride; | | |
see 1,2-Dichloroethylene............| | |
Acetylene tetrabromide................| 79-27-6 | 1 |
Acrolein..............................| 107-02-8 | 0.1 |
Acrylamide............................| 79-06-1 | ........ |
Acrylonitrile; see 1926.1145..........| 107-13-1 | |
Aldrin................................| 309-00-2 | ........ |
Allyl alcohol.........................| 107-18-6 | 2 |
Allyl chloride........................| 107-05-1 | 1 |
Allyl glycidyl ether (AGE)............| 106-92-3 | (C)10 |
Allyl propyl disulfide................| 2179-59-1 | 2 |
alpha-Alumina.........................| 1344-28-1 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Alundum; see alpha-Alumina............| | |
4-Aminodiphenyl; see 1926.1111........| 92-67-1 | |
2-Aminoethanol; see Ethanolamine......| | |
2-Aminopyridine.......................| 504-29-0 | 0.5 |
Ammonia...............................| 7664-41-7 | 50 |
Ammonium sulfamate....................| 7773-06-0 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
n-Amyl acetate........................| 628-63-7 | 100 |
sec-Amyl acetate......................| 626-38-0 | 125 |
Aniline and homologs..................| 62-53-3 | 5 |
Anisidine (o-,p-isomers)..............| 29191-52-4 | ........ |
Antimony and compounds (as Sb)........| 7440-36-0 | ........ |
ANTU (alpha Naphthylthiourea).........| 86-88-4 | ........ |
Argon.................................| 7440-37-1 | E |
Arsenic, inorganic compounds (as As); | | |
see 1926.1118.......................| 7440-38-2 | ........ |
Arsenic, organic compounds (as As)....| 7440-38-2 | ........ |
Arsine................................| 7784-42-1 | 0.05 |
Asbestos; see 1926.58.................| | |
Azinphos-methyl.......................| 86-50-0 | ........ |
Barium, soluble compounds (as Ba).....| 7440-39-3 | ........ |
Benzene(g); See 1926.1128.............| 71-43-2 | |
Benzidine; See 1926.1110..............| 92-87-5 | |
p-Benzoquinone; see Quinone...........| | |
Benzo(a)pyrene; see Coal tar pitch | | |
volatiles...........................| | |
Benzoyl peroxide......................| 94-36-0 | ........ |
Benzyl chloride.......................| 100-44-7 | 1 |
Beryllium and beryllium compounds | | |
(as Be).............................| 7440-41-7 | ........ |
Biphenyl; see Diphenyl................| | |
Bisphenol A; see Diglycidyl ether.....| | |
Boron oxide...........................| 1303-86-2 | |
Total dust..........................| | ........ |
Boron tribromide......................| 10294-33-4 | 1 |
Boron trifluoride.....................| 7637-07-2 | (C)1 |
Bromine...............................| 7726-95-6 | 0.1 |
Bromine pentafluoride.................| 7789-30-2 | 0.1 |
Bromoform.............................| 75-25-2 | 0.5 |
Butadiene (1,3-Butadiene); See 29 | | |
CFR 1910.1051; 29 CFR 1910.19(1)....| 106-99-0 | 1 ppm/5 |
| | ppm STEL |
Butanethiol; see Butyl mercaptan......| | |
2-Butanone (Methyl ethyl ketone).....| 78-93-3 | 200 |
2-Butoxyethanol.......................| 111-76-2 | 50 |
n-Butyl-acetate.......................| 123-86-4 | 150 |
sec-Butyl acetate.....................| 105-46-4 | 200 |
tert-Butyl-acetate....................| 540-88-5 | 200 |
n-Butyl alcohol.......................| 71-36-3 | 100 |
sec-Butyl alcohol.....................| 78-92-2 | 150 |
tert-Butyl alcohol....................| 75-65-0 | 100 |
Butylamine............................| 109-73-9 | (C)5 |
tert-Butyl chromate (as CrO(3)).......| 1189-85-1 | ........ |
n-Butyl glycidyl ether (BGE)..........| 2426-08-6 | 50 |
Butyl mercaptan.......................| 109-79-5 | 0.5 |
p-tert-Butyltoluene...................| 98-51-1 | 10 |
Cadmium (as Cd); see 1910.1027........| 7440-43-9 | |
Calcium Carbonate.....................| 1317-65-3 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Calcium oxide.........................| 1305-78-8 | ........ |
Calcium sulfate.......................| 7778-18-9 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Camphor, synthetic....................| 76-22-2 | ........ |
Carbaryl (Sevin)......................| 63-25-2 | ........ |
Carbon black..........................| 1333-86-4 | ........ |
Carbon dioxide........................| 124-38-9 | 5000 |
Carbon disulfide......................| 75-15-0 | 20 |
Carbon monoxide.......................| 630-08-0 | 50 |
Carbon tetrachloride..................| 56-23-5 | 10 |
Cellulose.............................| 9004-34-6 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Chlordane.............................| 57-74-9 | ........ |
Chlorinated camphene..................| 8001-35-2 | ........ |
Chlorinated diphenyl oxide............| 55720-99-5 | ........ |
Chlorine..............................| 7782-50-5 | 1 |
Chlorine dioxide......................| 10049-04-4 | 0.1 |
Chlorine trifluoride..................| 7790-91-2 | (C)0.1 |
Chloroacetaldehyde....................| 107-20-0 | (C)1 |
a-Chloroacetophenone | | |
(Phenacyl chloride).................| 532-27-4 | 0.05 |
Chlorobenzene.........................| 108-90-7 | 75 |
o-Chlorobenzylidene malononitrile.....| 2698-41-1 | 0.05 |
Chlorobromomethane....................| 74-97-5 | 200 |
2-Chloro-1,3-butadiene; | | |
See beta-Chloroprene................| | |
Chlorodiphenyl (42 percent Chlorine) | | |
(PCB)...............................| 53469-21-9 | ........ |
Chlorodiphenyl (54 percent Chlorine) | | |
(PCB)...............................| 11097-69-1 | ........ |
1-Chloro-2, 3-epoxypropane; | | |
See Epichlorohydrin.................| | |
2-Chloroethanol; | | |
See Ethylene chlorohydrin...........| | |
Chloroethylene; See Vinyl chloride....| | |
Chloroform (Trichloromethane).........| 67-66-3 | (C)50 |
bis(Chloromethyl) ether; | | |
see 1926.1108.......................| 542-88-1 | |
Chloromethyl methyl ether; | | |
see 1926.1106.......................| 107-30-2 | |
1-Chloro-1-nitropropane...............| 600-25-9 | 20 |
Chloropicrin..........................| 76-06-2 | 0.1 |
beta-Chloroprene......................| 126-99-8 | 25 |
Chromic acid and chromates (as CrO(3))| Varies with | ........ |
| compound | |
Chromium (II) compounds (as Cr).......| 7440-47-3 | ........ |
Chromium (III) compounds (as Cr)......| 7440-47-3 | ........ |
Chromium metal and insol. salts | | |
(as Cr).............................| 7440-47-3 | ........ |
Chrysene; see Coal tar pitch volatiles| | |
Coal tar pitch volatiles (benzene | | |
soluble fraction), anthracene, BaP, | | |
phenanthrene, acridine, chrysene, | | |
pyrene..............................| 65996-93-2 | ........ |
Cobalt metal, dust, and fume (as Co)..| 7440-48-4 | ........ |
Coke oven emissions; see 1926.1129....| | |
Copper................................| 7440-50-8 | |
Fume (as Cu)........................| | ........ |
Dusts and mists (as Cu).............| | ........ |
Corundum; see Emery...................| | |
Cotton dust (raw).....................| | ........ |
Crag herbicide (Sesone)...............| 136-78-7 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Cresol, all isomers...................| 1319-77-3 | 5 |
Crotonaldehyde........................| 123-73-9 | 2 |
| 4170-30-3 | |
Cumene................................| 98-82-8 | 50 |
Cyanides (as CN)......................| Varies with | ........ |
| Compound | |
Cyanogen..............................| 460-19-5 | 10 |
Cyclohexane...........................| 110-82-7 | 300 |
Cyclohexanol..........................| 108-93-0 | 50 |
Cyclohexanone.........................| 108-94-1 | 50 |
Cyclohexene...........................| 110-83-8 | 300 |
Cyclonite ............................| 121-82-4 | ........ |
Cyclopentadiene.......................| 542-92-7 | 75 |
DDT, | | |
see Dichlorodiphenyltrichloroethane.| ......... | ........ |
DDVP, see Dichlorvos..................| ......... | ........ |
2,4-D (Dichlorophenoxyacetic acid)....| 94-75-7 | ........ |
Decaborane............................| 17702-41-9 | 0.05 |
Demeton (Systox)......................| 8065-48-3 | ........ |
Diacetone alcohol | | |
(4-Hydroxy-4-methyl-2-pentanone)....| 123-42-2 | 50 |
1,2-Diaminoethane; | | |
see Ethylenediamine.................| | |
Diazomethane..........................| 334-88-3 | 0.2 |
Diborane..............................| 19287-45-7 | 0.1 |
1,2-Dibromo-3-chloropropane (DBCP); | | |
see 1926.1144.......................| 96-12-8 | |
1,2-Dibromoethane; | | |
see Ethylene dibromide..............| | |
Dibutyl phosphate.....................| 107-66-4 | 1 |
Dibutyl phthalate.....................| 84-74-2 | ........ |
Dichloroacetylene.....................| 7572-29-4 | (C)0.1 |
o-Dichlorobenzene.....................| 95-50-1 | (C)50 |
p-Dichlorobenzene.....................| 106-46-7 | 75 |
3,3'-Dichlorobenzidine; see 1926.1107.| 91-94-1 | |
Dichlorodifluoromethane...............| 75-71-8 | 1000 |
1,3-Dichloro-5, 5-dimethyl hydantoin..| 118-52-5 | ........ |
Dichlorodiphenyltrichloroethane (DDT).| 50-29-3 | ........ |
1,1-Dichloroethane....................| 75-34-3 | 100 |
1,2-Dichloroethane; | | |
see Ethylene dichloride.............| | |
1,2-Dichloroethylene..................| 540-59-0 | 200 |
Dichloroethyl ether...................| 111-44-4 | (C)15 |
Dichloromethane; | | |
see Methylene chloride..............| | |
Dichloromonofluoromethane.............| 75-43-4 | 1000 |
1,1-Dichloro-1-nitroethane............| 594-72-9 | (C)10 |
1,2-Dichloropropane; | | |
see Propylene dichloride............| | |
Dichlorotetrafluoroethane.............| 76-14-2 | 1000 |
Dichlorvos (DDVP).....................| 62-73-7 | ........ |
Dieldrin..............................| 60-57-1 | ........ |
Diethylamine..........................| 109-89-7 | 25 |
2-Diethylaminoethanol.................| 100-37-8 | 10 |
Diethylene triamine...................| 111-40-0 | (C)10 |
Diethyl ether; see Ethyl ether........| | |
Difluorodibromomethane................| 75-61-6 | 100 |
Diglycidyl ether (DGE)................| 2238-07-5 | (C)0.5 |
Dihydroxybenzene; see Hydroquinone....| | |
Diisobutyl ketone.....................| 108-83-8 | 50 |
Diisopropylamine......................| 108-18-9 | 5 |
4-Dimethylaminoazobenzene; | | |
see 1926.1115.......................| 60-11-7 | |
Dimethoxymethane; see Methylal........| | |
Dimethyl acetamide....................| 127-19-5 | 10 |
Dimethylamine.........................| 124-40-3 | 10 |
Dimethylaminobenzene; see Xylidine....| | |
Dimethylaniline (N,N-Dimethylaniline).| 121-69-7 | 5 |
Dimethylbenzene; see Xylene...........| | |
Dimethyl-1,2-dibromo-2, | | |
2-dichloroethyl phosphate...........| 300-76-5 | ........ |
Dimethylformamide.....................| 68-12-2 | 10 |
2,6-Dimethyl-4-heptanone; | | |
see Diisobutyl ketone...............| | |
1,1-Dimethylhydrazine.................| 57-14-7 | 0.5 |
Dimethylphthalate.....................| 131-11-3 | ........ |
Dimethyl sulfate......................| 77-78-1 | 1 |
Dinitrobenzene | | |
(all isomers).......................| | |
(ortho).............................| 528-29-0 | |
(meta)..............................| 99-65-0 | |
(para)..............................| 100-25-4 | |
Dinitro-o-cresol......................| 534-52-1 | ........ |
Dinitrotoluene........................| 25321-14-6 | ........ |
Dioxane (Diethylene dioxide)..........| 123-91-1 | 100 |
Diphenyl (Biphenyl)...................| 92-52-4 | 0.2 |
Diphenylamine ........................| 122-39-4 | ........ |
Diphenylmethane diisocyanate; | | |
see Methylene bisphenyl isocyanate..| | |
Dipropylene glycol methyl ether.......| 34590-94-8 | 100 |
Di-sec octyl phthalate | | |
(Di-(2-ethylhexyl) phthalate).......| 117-81-7 | ........ |
Emery.................................| 12415-34-8 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Endosulfan............................| 115-29-7 | ........ |
Endrin................................| 72-20-8 | ........ |
Epichlorohydrin.......................| 106-89-8 | 5 |
EPN...................................| 2104-64-5 | ........ |
1,2-Epoxypropane; see Propylene oxide.| | |
2,3-Epoxy-1-propanol; see Glycidol....| | |
Ethane................................| 74-84-0 | E |
Ethanethiol; see Ethyl mercaptan.....| | |
Ethanolamine..........................| 141-43-5 | 3 |
2-Ethoxyethanol (Cellosolve)..........| 110-80-5 | 200 |
2-Ethoxyethyl acetate | | |
(Cellosolve acetate)................| 111-15-9 | 100 |
Ethyl acetate.........................| 141-78-6 | 400 |
Ethyl acrylate........................| 140-88-5 | 25 |
Ethyl alcohol (Ethanol)...............| 64-17-5 | 1000 |
Ethylamine............................| 75-04-7 | 10 |
Ethyl amyl ketone | | |
(5-Methyl-3-heptanone)..............| 541-85-5 | 25 |
Ethyl benzene.........................| 100-41-4 | 100 |
Ethyl bromide.........................| 74-96-4 | 200 |
Ethyl butyl ketone (3-Heptanone)......| 106-35-4 | 50 |
Ethyl chloride........................| 75-00-3 | 1000 |
Ethyl ether...........................| 60-29-7 | 400 |
Ethyl formate.........................| 109-94-4 | 100 |
Ethyl mercaptan.......................| 75-08-1 | 0.5 |
Ethyl silicate........................| 78-10-4 | 100 |
Ethylene..............................| 74-85-1 | E |
Ethylene chlorohydrin.................| 107-07-3 | 5 |
Ethylenediamine.......................| 107-15-3 | 10 |
Ethylene dibromide....................| 106-93-4 | (C)25 |
Ethylene dichloride | | |
(1,2-Dichloroethane)................| 107-06-2 | 50 |
Ethylene glycol dinitrate.............| 628-96-6 | (C)0.2 |
Ethylene glycol methyl acetate; | | |
see Methyl cellosolve acetate.......| | |
Ethyleneimine; see 1926.1112..........| 151-56-4 | |
Ethylene oxide; see 1926.1147.........| 75-21-8 | |
Ethylidene chloride; | | |
see 1,1-Dichlorethane...............| | |
N-Ethylmorpholine.....................| 100-74-3 | 20 |
Ferbam................................| 14484-64-1 | |
Total dust..........................| | ........ |
Ferrovanadium dust....................| 12604-58-9 | ........ |
Fibrous Glass.........................| | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Fluorides (as F)......................| Varies with | ........ |
| compound | |
Fluorine..............................| 7782-41-4 | 0.1 |
Fluorotrichloromethane | | |
(Trichlorofluoromethane)............| 75-69-4 | 1000 |
Formaldehyde; see 1926.1148...........| 50-00-0 | |
Formic acid...........................| 64-18-6 | 5 |
Furfural..............................| 98-01-1 | 5 |
Furfuryl alcohol......................| 98-00-0 | 50 |
Gasoline..............................| 8006-61-9 | |
Glycerin (mist).......................| 56-81-5 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Glycidol..............................| 556-52-5 | 50 |
Glycol monoethyl ether; | | |
see 2-Ethoxyethanol.................| | |
Graphite, natural | | |
respirable dust.....................| 7782-42-5 | (2) |
Graphite, synthetic...................| | |
Total dust..........................| | ........ |
Respirable Fraction.................| | ........ |
Guthion; see Azinphos methyl..........| | |
Gypsum................................| 13397-24-5 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Hafnium...............................| 7440-58-6 | ........ |
Helium................................| 7440-59-7 | E |
Heptachlor............................| 76-44-8 | ........ |
Heptane (n-Heptane)...................| 142-82-5 | 500 |
Hexachloroethane......................| 67-72-1 | 1 |
Hexachloronaphthalene.................| 1335-87-1 | ........ |
n-Hexane..............................| 110-54-3 | 500 |
2-Hexanone (Methyl n-butyl ketone)....| 591-78-6 | 100 |
Hexone (Methylisobutyl ketone)........| 108-10-1 | 100 |
sec-Hexyl acetate.....................| 108-84-9 | 50 |
Hydrazine.............................| 302-01-2 | 1 |
Hydrogen..............................| 1333-74-0 | E |
Hydrogen bromide......................| 10035-10-6 | 3 |
Hydrogen chloride.....................| 7647-01-0 | (C)5 |
Hydrogen cyanide......................| 74-90-8 | 10 |
Hydrogen fluoride (as F)..............| 7664-39-3 | 3 |
Hydrogen peroxide.....................| 7722-84-1 | 1 |
Hydrogen selenide (as Se).............| 7783-07-5 | 0.05 |
Hydrogen sulfide......................| 7783-06-4 | 10 |
Hydroquinone..........................| 123-31-9 | ........ |
Indene................................| 95-13-6 | 10 |
Indium and compounds (as in)..........| 7440-74-6 | ........ |
Iodine................................| 7553-56-2 | (C)0.1 |
Iron oxide fume.......................| 1309-37-1 | ........ |
Iron salts (soluble) (as Fe)..........| Varies with | ........ |
| compound | |
Isomyl acetate........................| 123-92-2 | 100 |
Isomyl alcohol (primary and secondary)| 123-51-3 | 100 |
Isobutyl acetate......................| 110-19-0 | 150 |
Isobutyl alcohol......................| 78-83-1 | 100 |
Isophorone............................| 78-59-1 | 25 |
Isopropyl acetate.....................| 108-21-4 | 250 |
Isopropyl alcohol.....................| 67-63-0 | 400 |
Isopropylamine........................| 75-31-0 | 5 |
Isopropyl ether.......................| 108-20-3 | 500 |
Isopropyl glycidyl ether (IGE)........| 4016-14-2 | 50 |
Kaolin................................| 1332-58-7 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Ketene................................| 463-51-4 | 0.5 |
Lead inorganic (as Pb); see 1926.62...| 7439-92-1 | |
Limestone.............................| 1317-65-3 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Lindane...............................| 58-89-9 | ........ |
Lithium hydride.......................| 7580-67-8 | ........ |
L.P.G. (Liquified petroleum gas)......| 68476-85-7 | 1000 |
Magnesite.............................| 546-93-0 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Magnesium oxide fume..................| 1309-48-4 | |
Total Particulate...................| | ........ |
Malathion.............................| 121-75-5 | |
Total dust..........................| | ........ |
Maleic anhydride......................| 108-31-6 | 0.25 |
Manganese compounds (as Mn)...........| 7439-96-5 | ........ |
Manganese fume (as Mn)................| 7439-96-5 | ........ |
Marble................................| 1317-65-3 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Mercury (aryl and inorganic)(as Hg)...| 7439-97-6 | |
Mercury (organo) alkyl compounds | | |
(as Hg).............................| 7439-97-6 | |
Mercury (vapor) (as Hg)...............| 7439-97-6 | |
Mesityl oxide.........................| 141-79-7 | 25 |
Methane...............................| 74-82-8 | E |
Methanethiol; see Methyl mercaptan....| | |
Methoxychlor..........................| 72-43-5 | |
Total dust..........................| | ........ |
2-Methoxyethanol; (Methyl cellosolve).| 109-86-4 | 25 |
2- Methoxyethyl acetate | | |
(Methyl cellosolve acetate).........| 110-49-6 | 25 |
Methyl acetate........................| 79-20-9 | 200 |
Methyl acetylene (Propyne)............| 74-99-7 | 1000 |
Methyl acetylene propadiene mixture | | |
(MAPP)..............................| | 1000 |
Methyl acrylate.......................| 96-33-3 | 10 |
Methylal (Dimethoxy-methane)..........| 109-87-5 | 1000 |
Methyl alcohol........................| 67-56-1 | 200 |
Methylamine...........................| 74-89-5 | 10 |
Methyl amyl alcohol; | | |
see Methyl Isobutyl carbinol........| | |
Methyl n-amyl ketone..................| 110-43-0 | 100 |
Methyl bromide........................| 74-83-9 | (C)20 |
Methyl butyl ketone; see 2-Hexanone...| | |
Methyl cellosolve; | | |
see 2-Methoxyethanol................| | |
Methyl cellosolve acetate; | | |
see 2-Methoxyethyl acetate..........| | |
Methyl chloride.......................| 74-87-3 | 100 |
Methyl chloroform | | |
(1,1,1-Trichloroethane).............| 71-55-6 | 350 |
Methylcyclohexane.....................| 108-87-2 | 500 |
Methylcyclohexanol....................| 25639-42-3 | 100 |
o-Methylcyclohexanone.................| 583-60-8 | 100 |
Methylene chloride: see 1910.1052.....| | |
Methyl ethyl ketone (MEK); | | |
see 2-Butanone......................| | |
Methyl formate........................| 107-31-3 | 100 |
Methyl hydrazine | | |
(Monomethyl hydrazine)..............| 60-34-4 | (C)0.2 |
Methyl iodide.........................| 74-88-4 | 5 |
Methyl isoamyl ketone.................| 110-12-3 | 100 |
Methyl isobutyl carbinol..............| 108-11-2 | 25 |
Methyl isobutyl ketone; see Hexone....| | |
Methyl isocyanate.....................| 624-83-9 | 0.02 |
Methyl mercaptan......................| 74-93-1 | 0.5 |
Methyl methacrylate...................| 80-62-6 | 100 |
Methyl propyl ketone; see 2-Pentanone.| | |
Methyl silicate.......................| 681-84-5 | (C)5 |
alpha-Methyl styrene..................| 98-83-9 |(C)100 |
Methylene bisphenyl isocyanate (MDI)..| 101-68-8 | (C)0.02 |
Methylenedianiline (MDA)..............| 101-77-9 | ........ |
Mica; see Silicates...................| | |
Molybdenum (as Mo)....................| 7439-98-7 | |
Soluble compounds...................| | ........ |
Insoluble Compounds | | |
Total dust........................| | ........ |
Monomethyl aniline....................| 100-61-8 | 2 |
Monomethyl hydrazine; | | |
see Methyl hydrazine................| | |
Morpholine............................| 110-91-8 | 20 |
Naphtha (Coal tar)....................| 8030-30-6 | 100 |
Naphthalene...........................| 91-20-3 | 10 |
alpha-Naphthylamine; see 1926.1104....| 134-32-7 | |
beta-Naphthylamine; see 1926.1109.....| 91-59-8 | |
Neon..................................| 7440-01-9 | E |
Nickel carbonyl (as Ni)...............| 13463-39-3 | 0.001|
Nickel, metal and insoluble compounds | | |
(as Ni).............................| 7440-02-0 | ........ |
Nickel, soluble compounds (as Ni).....| 7440-02-0 | ........ |
Nicotine..............................| 54-11-5 | ........ |
Nitric acid...........................| 7697-37-2 | 2 |
Nitric oxide..........................| 10102-43-9 | 25 |
p-Nitroaniline........................| 100-01-6 | 1 |
Nitrobenzene..........................| 98-95-3 | 1 |
p-Nitrochlorobenzene..................| 100-00-5 | ........ |
4-Nitrodiphenyl; see 1926.1103........| 92-93-3 | |
Nitroethane...........................| 79-24-3 | 100 |
Nitrogen..............................| 7727-37-9 | E |
Nitrogen dioxide......................| 10102-44-0 | (C)5 |
Nitrogen trifluoride..................| 7783-54-2 | 10 |
Nitroglycerin.........................| 55-63-0 | (C)0.2 |
Nitromethane..........................| 75-52-5 | 100 |
1-Nitropropane........................| 108-03-2 | 25 |
2-Nitropropane........................| 79-46-9 | 25 |
N-Nitrosodimethylamine; see 1926.1116.| 62-79-9 | |
Nitrotoluene (all isomers)............| | 5 |
o-isomer............................| 88-72-2 | |
m-isomer............................| 99-08-1 | |
p-isomer............................| 99-99-0 | |
Nitrotrichloromethane; | | |
see Chloropicrin....................| | |
Nitrous oxide.........................| 10024-97-2 | E |
Octachloronaphthalene.................| 2234-13-1 | ........ |
Octane................................| 111-65-9 | 400 |
Oil mist, mineral.....................| 8012-95-1 | ........ |
Osmium tetroxide (as Os)..............| 20816-12-0 | ........ |
Oxalic acid...........................| 144-62-7 | ........ |
Oxygen difluoride.....................| 7783-41-7 | 0.05 |
Ozone.................................| 10028-15-6 | 0.1 |
Paraquat, respirable dust.............| 4685-14-7 | ........ |
| 1910-42-5 | |
| 2074-50-2 | |
Parathion.............................| 56-38-2 | ........ |
Particulates not otherwise regulated..| | |
Total dust organic and inorganic....| | ........ |
PCB; see Chlorodiphenyl | | |
(42 percent and 54 percent chlorine)| | |
Pentaborane...........................| 19624-22-7 | 0.005|
Pentachloronaphthalene................| 1321-64-8 | ........ |
Pentachlorophenol.....................| 87-86-5 | ........ |
Pentaerythritol.......................| 115-77-5 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Pentane...............................| 109-66-0 | 500 |
2-Pentanone (Methyl propyl ketone)....| 107-87-9 | 200 |
Perchloroethylene | | |
(Tetrachloroethylene)...............| 127-18-4 | 100 |
Perchloromethyl mercaptan.............| 594-42-3 | 0.1 |
Perchloryl fluoride...................| 7616-94-6 | 3 |
Petroleum distillates | | |
(Naphtha)(Rubber Solvent)...........| | |
Phenol................................| 108-95-2 | 5 |
p-Phenylene diamine...................| 106-50-3 | ........ |
Phenyl ether, vapor...................| 101-84-8 | 1 |
Phenyl ether-biphenyl mixture, vapor..| | 1 |
Phenylethylene; see Styrene...........| | |
Phenyl glycidyl ether (PGE)...........| 122-60-1 | 10 |
Phenylhydrazine.......................| 100-63-0 | 5 |
Phosdrin (Mevinphos)..................| 7786-34-7 | ........ |
Phosgene (Carbonyl chloride)..........| 75-44-5 | 0.1 |
Phosphine.............................| 7803-51-2 | 0.3 |
Phosphoric acid.......................| 7664-38-2 | ........ |
Phosphorus (yellow)...................| 7723-14-0 | ........ |
Phosphorus pentachloride..............| 10026-13-8 | ........ |
Phosphorus pentasulfide...............| 1314-80-3 | ........ |
Phosphorus trichloride................| 7719-12-2 | 0.5 |
Phthalic anhydride....................| 85-44-9 | 2 |
Picric acid...........................| 88-89-1 | ........ |
Pindone (2-Pivalyl-1, 3-indandione)...| 83-26-1 | ........ |
Plaster of paris......................| 26499-65-0 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Platinum (as Pt)......................| 7440-06-4 | |
Metal...............................| | ........ |
Soluble Salts.......................| | ........ |
Polytetrafluoroethylene | | |
decomposition products..............| | |
Portland cement.......................| 65997-15-1 | |
Total dust..........................| | |
Respirable fraction.................| | |
Propane...............................| 74-98-6 | E |
Propargyl alcohol.....................| 107-19-7 | 1 |
beta-Propriolactone; see 1926.1113....| 57-57-8 | |
n-Propyl acetate......................| 109-60-4 | 200 |
n-Propyl alcohol......................| 71-23-8 | 200 |
n-Propyl nitrate......................| 627-13-4 | 25 |
Propylene dichloride..................| 78-87-5 | 75 |
Propylene imine.......................| 75-55-8 | 2 |
Propylene oxide.......................| 75-56-9 | 100 |
Propyne; see Methyl acetylene.........| | |
Pyrethrum.............................| 8003-34-7 | ........ |
Pyridine..............................| 110-86-1 | 5 |
Quinone...............................| 106-51-4 | 0.1 |
RDX: see Cyclonite....................| | |
Rhodium (as Rh), metal fume and | | |
insoluble compounds.................| 7440-16-6 | ........ |
Rhodium (as Rh), soluble compounds....| 7440-16-6 | ........ |
Ronnel................................| 299-84-3 | ........ |
Rotenone..............................| 83-79-4 | ........ |
Rouge.................................| | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Selenium compounds (as Se)............| 7782-49-2 | ........ |
Selenium hexafluoride (as Se).........| 7783-79-1 | 0.05 |
Silica, amorphous, precipitated | | |
and gel.............................| 112926-00-8 | (2) |
Silica, amorphous, diatomaceous earth,| | |
containing less than 1 percent | | |
crystalline silica..................| 61790-53-2 | (2) |
Silica, crystalline cristobalite, | | |
respirable dust.....................| 14464-46-1 | (2) |
Silica, crystalline quartz, | | |
respirable dust.....................| 14808-60-7 | (2) |
Silica, crystalline tripoli | | |
(as quartz), respirable dust........| 1317-95-9 | (2) |
Silica, crystalline tridymite, | | |
respirable dust.....................| 15468-32-3 | (2) |
Silica, fused, respirable dust........| 60676-86-0 | (2) |
Silicates (less than 1 percent | | |
crystalline silica) Mica | | |
(respirable dust)...................| 12001-26-2 | (2) |
Soapstone, total dust.................| | (2) |
Soapstone, respirable dust..........| | (2) |
Talc (containing asbestos); | | |
use asbesto limit; see 1926.58....| | |
Talc (containing no asbestos), | | |
respirable dust...................| 14807-96-6 | (2) |
Tremolite, abestiform; see 1926.58..| | |
Silicon carbide.......................| 409-21-2 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Silver, metal and soluble compounds | | |
(as Ag).............................| 7440-22-4 | ........ |
Soapstone; see Silicates..............| | |
Sodium fluoroacetate..................| 62-74-8 | ........ |
Sodium hydroxide......................| 1310-73-2 | ........ |
Starch................................| 9005-25-8 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Stibine...............................| 7803-52-3 | 0.1 |
Stoddard solvent......................| 8052-41-3 | 200 |
Strychnine............................| 57-24-9 | ........ |
Styrene...............................| 100-42-5 | (C)100 |
Sucrose...............................| 57-50-1 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Sulfur dioxide........................| 7446-09-5 | 5 |
Sulfur hexafluoride...................| 2551-62-4 | 1000 |
Sulfuric acid.........................| 7664-93-9 | ........ |
Sulfur monochloride...................| 10025-67-9 | 1 |
Sulfur pentafluoride..................| 5714-22-7 | 0.025|
Sulfuryl fluoride.....................| 2699-79-8 | 5 |
Systox; see Demeton..................| | |
2,4,5-T | | |
(2,4,5-tri-chlorophenoxyacetic acid)| 93-76-5 | ........ |
Talc; see Silicates..................| | |
Tantalum, metal and oxide dust........| 7440-25-7 | ........ |
TEDP (Sulfotep).......................| 3689-24-5 | ........ |
Teflon decomposition products.........| | |
Tellurium and compounds (as Te).......| 13494-80-9 | ........ |
Tellurium hexafluoride (as Te)........| 7783-80-4 | 0.02 |
Temephos..............................| 3383-96-8 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
TEPP (Tetraethyl pyrophosphaate)......| 107-49-3 | ........ |
Terphenylis...........................| 26140-60-3 | (C)1 |
1,1,1,2-Tetrachloro-2, | | |
2-difluoroethane....................| 76-11-9 | 500 |
1,1,2,2-Tetrachloro-1, | | |
2-difluoroethane....................| 76-12-0 | 500 |
1,1,2,2-Tetrachloroethane.............| 79-34-5 | 5 |
Tetrachoroethylene; | | |
see Perchloroethylene...............| | |
Tetrachloromethane; | | |
see Carbon tetrachloride............| | |
Tetrachloronaphthalene................| 1335-88-2 | ........ |
Tetraethyl lead (as Pb)...............| 78-00-2 | ........ |
Tetrahydrofuran.......................| 109-99-9 | 200 |
Tetramethyl lead, (as Pb).............| 75-74-1 | ........ |
Tetramethyl succinonitrile............| 3333-52-6 | 0.5 |
Tetranitromethane.....................| 509-14-8 | 1 |
Tetryl (2,4,6-Trinitrophenylmethyl- | | |
nitramine)..........................| 479-45-8 | ........ |
Thallium, soluble compounds (as Tl)...| 7440-28-0 | ........ |
Thiram................................| 137-26-8 | ........ |
Tin, inorganic compounds | | |
(except oxides) (as Sn).............| 7440-31-5 | ........ |
Tin, organic compounds (as Sn)........| 7440-31-5 | ........ |
Tin oxide (as Sn).....................| 21651-19-4 | ........ |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Titanium dioxide......................| 13463-67-7 | |
Total dust..........................| | ........ |
Toluene...............................| 108-88-3 | 200 |
Toluene-2, 4-diisocyanate (TDI).......| 584-84-9 | (C)0.02 |
o-Toluidine...........................| 95-53-4 | 5 |
Toxaphene; see Chlorinated camphene...| | |
Tremolite; see Silicates..............| | |
Tributyl phosphate....................| 126-73-8 | ........ |
1,1,1-Trichloroethane; | | |
see Methyl chloroform...............| | |
1,1,2-Trichloroethane.................| 79-00-5 | 10 |
Trichloroethylene.....................| 79-01-6 | 100 |
Trichloromethane; see Chloroform......| | |
Trichloronaphthalene..................| 1321-65-9 | ........ |
1,2,3-Trichloropropane................| 96-18-4 | 50 |
1,1,2-Trichloro-1,2, 2-trifluoroethane| 76-13-1 | 1000 |
Triethylamine.........................| 121-44-8 | 25 |
Trifluorobromomethane.................| 75-63-8 | 1000 |
Trimethyl benzene.....................| 25551-13-7 | 25 |
2,4,6-Trinitrophenyl; see Picric acid.| | |
2,4,6-Trinitrophenylmethyl nitramine; | | |
see Tetryl..........................| | |
2,4,6-Trinitrotoluene (TNT)...........| 118-96-7 | ........ |
Triorthocresyl phosphate..............| 78-30-8 | ........ |
Triphenyl phosphate...................| 115-86-6 | ........ |
Tungsten (as W).......................| 7440-33-7 | |
Insoluble compounds.................| | ........ |
Soluble compounds...................| | ........ |
Turpentine............................| 8006-64-2 | 100 |
Uranium (as U)........................| 7440-61-1 | |
Soluble compounds...................| | ........ |
Insoluble compounds.................| | ........ |
Vanadium..............................| 1314-62-1 | |
Respirable dust (as V(2)O(5)).......| | ........ |
Fume (as V(2)O(5))..................| | ........ |
Vegetable oil mist....................| | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Vinyl benzene; see Styrene............| | |
Vinyl chloride; see 1926.1117.........| 75-01-4 | |
Vinyl cyanide; see Acrylonitrile......| | |
Vinyl toluene.........................| 25013-15-4 | 100 |
Warfarin..............................| 81-81-2 | ........ |
Xylenes (o-, m-, p-isomers)...........| 1330-20-7 | 100 |
Xylidine..............................| 1300-73-8 | 5 |
Yttrium...............................| 7440-65-5 | ........ |
Zinc chloride fume....................| 7646-85-7 | ........ |
Zinc oxide fume.......................| 1314-13-2 | ........ |
Zinc oxide............................| 1314-13-2 | |
Total dust..........................| | ........ |
Respirable fraction.................| | ........ |
Zirconium compounds (as Zr)...........| 7440-67-7 | ........ |
______________________________________|_____________|__________|
THRESHOLD LIMIT VALUES OF AIRBORNE
CONTAMINANTS FOR CONSTRUCTION
[Continued]
____________________________________________________________________
| |
| | Skin
Substance | mg/m(3)(b) | Designation
______________________________________|________________|____________
| |
Abate; see Temephos...................| |
Acetaldehyde..........................| 360 | .......
Acetic acid...........................| 25 | .......
Acetic anhydride......................| 20 | .......
Acetone...............................| 2400 | .......
Acetonitrile..........................| 70 | .......
2-Acetylaminofluorene; see 1926.1114..| |
Acetylene.............................| |
Acetylene dichloride; | |
see 1,2-Dichloroethylene............| |
Acetylene tetrabromide................| 14 | .......
Acrolein..............................| 0.25 | .......
Acrylamide............................| 0.3 | X
Acrylonitrile; see 1926.1145..........| |
Aldrin................................| 0.25 | X
Allyl alcohol.........................| 5 | X
Allyl chloride........................| 3 | .......
Allyl glycidyl ether (AGE)............| (C)45 | .......
Allyl propyl disulfide................| 12 | .......
alpha-Alumina.........................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Alundum; see alpha-Alumina............| |
4-Aminodiphenyl; see 1926.1111........| |
2-Aminoethanol; see Ethanolamine......| |
2-Aminopyridine.......................| 2 | .......
Ammonia...............................| 35 | .......
Ammonium sulfamate....................| |
Total dust..........................| 15 | .......
Respirable fraction.................| 5 | .......
n-Amyl acetate........................| 525 | .......
sec-Amyl acetate......................| 650 | .......
Aniline and homologs..................| 19 | X
Anisidine (o-,p-isomers)..............| 0.5 | X
Antimony and compounds (as Sb)........| 0.5 | .......
ANTU (alpha Naphthylthiourea).........| 0.3 | .......
Argon.................................| |
Arsenic, inorganic compounds (as As); | |
see 1926.1118.......................| ....... | .......
Arsenic, organic compounds (as As)....| 0.5 | .......
Arsine................................| 0.2 | .......
Asbestos; see 1926.58.................| |
Azinphos-methyl.......................| 0.2 | X
Barium, soluble compounds (as Ba).....| 0.5 | .......
Benzene(g); See 1926.1128.............| |
Benzidine; See 1926.1110..............| |
p-Benzoquinone; see Quinone...........| |
Benzo(a)pyrene; see Coal tar pitch | |
volatiles...........................| |
Benzoyl peroxide......................| 5 | .......
Benzyl chloride.......................| 5 | .......
Beryllium and beryllium compounds | |
(as Be).............................| 0.002 | .......
Biphenyl; see Diphenyl................| |
Bisphenol A; see Diglycidyl ether.....| |
Boron oxide...........................| |
Total dust..........................| 15 | .......
Boron tribromide......................| 10 | .......
Boron trifluoride.....................| (C)3 | .......
Bromine...............................| 0.7 | .......
Bromine pentafluoride.................| 0.7 | .......
Bromoform.............................| 5 | X
Butadiene (1,3-Butadiene); See 29 | |
CFR 1910.1051; 29 CFR 1910.19(1)....| | .......
Butanethiol; see Butyl mercaptan......| |
2-Butanone (Methyl ethyl ketone)......| 590 | .......
2-Butoxyethanol.......................| 240 | X
n-Butyl-acetate.......................| 710 | .......
sec-Butyl acetate.....................| 950 | .......
tert-Butyl-acetate....................| 950 | .......
n-Butyl alcohol.......................| 300 | .......
sec-Butyl alcohol.....................| 450 | .......
tert-Butyl alcohol....................| 300 | .......
Butylamine............................| (C)15 | X
tert-Butyl chromate (as CrO(3)).......| (C)0.1 | X
n-Butyl glycidyl ether (BGE)..........| 270 | .......
Butyl mercaptan.......................| 1.5 | .......
p-tert-Butyltoluene...................| 60 | .......
Cadmium (as Cd); see 1910.1027........| |
Calcium Carbonate.....................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Calcium oxide.........................| 5 | .......
Calcium sulfate.......................| |
Total dust..........................| 15 | .......
Respirable fraction.................| 5 | .......
Camphor, synthetic....................| 2 | .......
Carbaryl (Sevin)......................| 5 | .......
Carbon black..........................| 3.5 | .......
Carbon dioxide........................| 9000 | .......
Carbon disulfide......................| 60 | X
Carbon monoxide.......................| 55 | .......
Carbon tetrachloride..................| 65 | X
Cellulose.............................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Chlordane.............................| 0.5 | X
Chlorinated camphene..................| 0.5 | X
Chlorinated diphenyl oxide............| 0.5 | .......
Chlorine..............................| 3 | .......
Chlorine dioxide......................| 0.3 |
Chlorine trifluoride..................| (C)0.4 | .......
Chloroacetaldehyde....................| (C)3 | .......
a-Chloroacetophenone | |
(Phenacyl chloride).................| 0.3 | .......
Chlorobenzene.........................| 350 | .......
o-Chlorobenzylidene malononitrile.....| 0.4 | .......
Chlorobromomethane....................| 1050 | .......
2-Chloro-1,3-butadiene; | |
See beta-Chloroprene................| |
Chlorodiphenyl (42 percent Chlorine) | |
(PCB)...............................| 1 | X
Chlorodiphenyl (54 percent Chlorine) | |
(PCB)...............................| 0.5 | X
1-Chloro-2, 3-epoxypropane; | |
See Epichlorohydrin.................| |
2-Chloroethanol; | |
See Ethylene chlorohydrin...........| |
Chloroethylene; See Vinyl chloride....| |
Chloroform (Trichloromethane).........| (C)240 | .......
bis(Chloromethyl) ether; | |
see 1926.1108.......................| |
Chloromethyl methyl ether; | |
see 1926.1106.......................| |
1-Chloro-1-nitropropane...............| 100 | .......
Chloropicrin..........................| 0.7 | .......
beta-Chloroprene......................| 90 | X
Chromic acid and chromates (as CrO(3))| 0.1 | .......
Chromium (II) compounds (as Cr).......| 0.5 | .......
Chromium (III) compounds (as Cr)......| 0.5 | .......
Chromium metal and insol. salts | |
(as Cr).............................| 1 | .......
Chrysene; see Coal tar pitch volatiles| |
Coal tar pitch volatiles (benzene | |
soluble fraction), anthracene, BaP, | |
phenanthrene, acridine, chrysene, | |
pyrene..............................| 0.2 | .......
Cobalt metal, dust, and fume (as Co)..| 0.1 | .......
Coke oven emissions; see 1926.1129....| 0.15 | .......
Copper................................| |
Fume (as Cu)........................| 0.1 | .......
Dusts and mists (as Cu).............| 1 | .......
Corundum; see Emery...................| |
Cotton dust (raw).....................| 1 |
Crag herbicide (Sesone)...............| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Cresol, all isomers...................| 22 | X
Crotonaldehyde........................| 6 |
| |
Cumene................................| 245 | X
Cyanides (as CN)......................| 5 | X
Cyanogen..............................| ....... | .......
Cyclohexane...........................| 1050 | .......
Cyclohexanol..........................| 200 | .......
Cyclohexanone.........................| 200 | .......
Cyclohexene...........................| 1015 | .......
Cyclonite ............................| 1.5 | X
Cyclopentadiene.......................| 200 | .......
DDT, | |
see Dichlorodiphenyltrichloroethane.| ....... |
DDVP, see Dichlorvos..................| ....... |
2,4-D (Dichlorophenoxyacetic acid)....| 10 | .......
Decaborane............................| 0.3 | X
Demeton (Systox)......................| 0.1 | X
Diacetone alcohol | |
(4-Hydroxy-4-methyl-2-pentanone)....| 240 | .......
1,2-Diaminoethane; | |
see Ethylenediamine.................| |
Diazomethane..........................| 0.4 | .......
Diborane..............................| 0.1 | .......
1,2-Dibromo-3-chloropropane (DBCP); | |
see 1926.1144.......................| | .......
1,2-Dibromoethane; | |
See Ethylene dibromide..............| |
Dibutyl phosphate.....................| 5 | .......
Dibutyl phthalate.....................| 5 | .......
Dichloroacetylene.....................| (C)0.4 | .......
o-Dichlorobenzene.....................| (C)300 | .......
p-Dichlorobenzene.....................| 450 | .......
3,3'-Dichlorobenzidine; see 1926.1107.| |
Dichlorodifluoromethane...............| 4950 | .......
1,3-Dichloro-5, 5-dimethyl hydantoin..| 0.2 | .......
Dichlorodiphenyltrichloroethane (DDT).| 1 | X
1,1-Dichloroethane....................| 400 | .......
1,2-Dichloroethane; | |
See Ethylene dichloride.............| |
1,2-Dichloroethylene..................| 790 | .......
Dichloroethyl ether...................| (C)90 | X
Dichloromethane; | |
See Methylene chloride..............| |
Dichloromonofluoromethane.............| 4200 | .......
1,1-Dichloro-1-nitroethane............| (C)60 | .......
1,2-Dichloropropane; | |
see Propylene dichloride............| |
Dichlorotetrafluoroethane.............| 7000 | .......
Dichlorvos (DDVP).....................| 1 | X
Dieldrin..............................| 0.25 | X
Diethylamine..........................| 75 | .......
2-Diethylaminoethanol.................| 50 | X
Diethylene triamine...................| (C)42 | X
Diethyl ether; see Ethyl ether........| |
Difluorodibromomethane................| 860 | .......
Diglycidyl ether (DGE)................| (C)2.8 | .......
Dihydroxybenzene; see Hydroquinone....| |
Diisobutyl ketone.....................| 290 | .......
Diisopropylamine......................| 20 | X
4-Dimethylaminoazo benzene; | |
see 1926.1115.......................| |
Dimethoxymethane; see Methylal........| |
Dimethyl acetamide....................| 35 | X
Dimethylamine.........................| 18 | .......
Dimethylaminobenzene; see Xylidine....| |
Dimethylaniline (N,N-Dimethylaniline).| 25 | X
Dimethylbenzene; see Xylene...........| |
Dimethyl-1,2-dibromo-2, | |
2-dichloroethyl phosphate...........| 3 | .......
Dimethylformamide.....................| 30 | X
2,6-Dimethyl-4-heptanone; | |
See Diisobutyl ketone...............| |
1,1-Dimethylhydrazine.................| 1 | X
Dimethylphthalate.....................| 5 | .......
Dimethyl sulfate......................| 5 | X
Dinitrobenzene | |
(all isomers).......................| 1 | X
(ortho).............................| |
(meta)..............................| |
(para)..............................| |
Dinitro-o-cresol......................| 0.2 | X
Dinitrotoluene........................| 1.5 | X
Dioxane (Diethylene dioxide)..........| 360 | X
Diphenyl (Biphenyl)...................| 1 | .......
Diphenylamine ........................| 10 | .......
Diphenylmethane diisocyanate; | |
see Methylene bisphenyl isocyanate..| |
Dipropylene glycol methyl ether.......| 600 | X
Di-sec octyl phthalate | |
(Di-(2-ethylhexyl) phthalate).......| 5 | .......
Emery.................................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Endosulfan............................| 0.1 | X
Endrin................................| 0.1 | X
Epichlorohydrin.......................| 19 | X
EPN...................................| 0.5 | X
1,2-Epoxypropane; see Propylene oxide.| |
2,3-Epoxy-1-propanol; see Glycidol....| |
Ethane................................| |
Ethanethiol; see Ethyl mercaptan.....| |
Ethanolamine..........................| 6 | .......
2-Ethoxyethanol (Cellosolve)..........| 740 | X
2-Ethoxyethyl acetate | |
(Cellosolve acetate)................| 540 | X
Ethyl acetate.........................| 1400 | .......
Ethyl acrylate........................| 100 | X
Ethyl alcohol (Ethanol)...............| 1900 | .......
Ethylamine............................| 18 | .......
Ethyl amyl ketone | |
(5-Methyl-3-heptanone)..............| 130 | .......
Ethyl benzene.........................| 435 | .......
Ethyl bromide.........................| 890 | .......
Ethyl butyl ketone (3-Heptanone)......| 230 | .......
Ethyl chloride........................| 2600 | .......
Ethyl ether...........................| 1200 | .......
Ethyl formate.........................| 300 | .......
Ethyl mercaptan.......................| 1 | .......
Ethyl silicate........................| 850 | .......
Ethylene..............................| |
Ethylene chlorohydrin.................| 16 | X
Ethylenediamine.......................| 25 | .......
Ethylene dibromide....................| (C)190 | X
Ethylene dichloride | |
(1,2-Dichloroethane)................| 200 | .......
Ethylene glycol dinitrate.............| (C)1 | X
Ethylene glycol methyl acetate; | |
see Methyl cellosolve acetate.......| |
Ethyleneimine; see 1926.1112..........| |
Ethylene oxide; see 1926.1147.........| |
Ethylidene chloride; | |
see 1,1-Dichlorethane...............| |
N-Ethylmorpholine.....................| 94 | X
Ferbam................................| |
Total dust..........................| 15 | .......
Ferrovanadium dust....................| 1 | .......
Fibrous Glass.........................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Fluorides (as F)......................| 2.5 | .......
Fluorine..............................| 0.2 | .......
Fluorotrichloromethane | |
(Trichlorofluoromethane)............| 5600 | .......
Formaldehyde; see 1926.1148...........| |
Formic acid...........................| 9 | .......
Furfural..............................| 20 | X
Furfuryl alcohol......................| 200 | .......
Gasoline..............................| A(3) | .......
Glycerin (mist).......................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Glycidol..............................| 150 | .......
Glycol monoethyl ether; | |
see 2-Ethoxyethanol.................| |
Graphite, natural | |
respirable dust.....................| (2) | (2)
Graphite, synthetic...................| |
Total dust..........................| | .......
Respirable Fraction.................| | .......
Guthion; see Azinphos methyl..........| |
Gypsum................................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Hafnium...............................| 0.5 | .......
Helium................................| |
Heptachlor............................| 0.5 | X
Heptane (n-Heptane)...................| 2000 | .......
Hexachloroethane......................| 10 | X
Hexachloronaphthalene.................| 0.2 | X
n-Hexane..............................| 1800 | .......
2-Hexanone (Methyl n-butyl ketone)....| 410 | .......
Hexone (Methyl isobutyl ketone).......| 410 | .......
sec-Hexyl acetate.....................| 300 | .......
Hydrazine.............................| 1.3 | X
Hydrogen..............................| |
Hydrogen bromide......................| 10 | .......
Hydrogen chloride.....................| (C)7 | .......
Hydrogen cyanide......................| 11 | X
Hydrogen fluoride (as F)..............| 2 | .......
Hydrogen peroxide.....................| 1.4 | .......
Hydrogen selenide (as Se).............| 0.2 | .......
Hydrogen sulfide......................| 15 | .......
Hydroquinone..........................| 2 | .......
Indene................................| 45 | .......
Indium and compounds (as in)..........| 0.1 | .......
Iodine................................| (C)1 | .......
Iron oxide fume.......................| 10 | .......
Iron salts (soluble) (as Fe)..........| 1 | .......
Isomyl acetate........................| 525 | .......
Isomyl alcohol (primary and secondary)| 360 | .......
Isobutyl acetate......................| 700 | .......
Isobutyl alcohol......................| 300 | .......
Isophorone............................| 140 | .......
Isopropyl acetate.....................| 950 | .......
Isopropyl alcohol.....................| 980 | .......
Isopropylamine........................| 12 | .......
Isopropyl ether.......................| 2100 | .......
Isopropyl glycidyl ether (IGE)........| 240 | .......
Kaolin................................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Ketene................................| 0.9 | .......
Lead inorganic (as Pb); see 1926.62...| |
Limestone.............................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Lindane...............................| 0.5 | X
Lithium hydride.......................| 0.025 | .......
L.P.G. (Liquified petroleum gas)......| 1800 |
Magnesite.............................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Magnesium oxide fume..................| |
Total Particulate...................| 15 | .......
Malathion.............................| |
Total dust..........................| 15 | X
Maleic anhydride......................| |
Manganese compounds (as Mn)...........| (C)5 | .......
Manganese fume (as Mn)................| (C)5 | .......
Marble................................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Mercury (aryl and inorganic)(as Hg)...| 0.1 | X
Mercury (organo) alkyl compounds | |
(as Hg).............................| 0.01 | X
Mercury (vapor) (as Hg)...............| 0.1 | X
Mesityl oxide.........................| 100 | .......
Methane...............................| |
Methanethiol; see Methyl mercaptan....| |
Methoxychlor..........................| |
Total dust..........................| 15 | .......
2-Methoxyethanol; (Methyl cellosolve).| 80 | X
2-Methoxyethyl acetate | |
(Methyl cellosolve acetate).........| 120 | X
Methyl acetate........................| 610 | .......
Methyl acetylene (Propyne)............| 1650 | .......
Methyl acetylene propadiene mixture | |
(MAPP)..............................| 1800 | .......
Methyl acrylate.......................| 35 | X
Methylal (Dimethoxy-methane)..........| 3100 | .......
Methyl alcohol........................| 260 | .......
Methylamine...........................| 12 | .......
Methyl amyl alcohol; | |
see Methyl Isobutyl carbinol........| |
Methyl n-amyl ketone..................| 465 | .......
Methyl bromide........................| (C)80 | X
Methyl butyl ketone; see 2-Hexanone...| |
Methyl cellosolve; | |
see 2-Methoxyethanol................| |
Methyl cellosolve acetate; | |
see 2-Methoxyethyl acetate..........| |
Methyl chloride.......................| 210 | .......
Methyl chloroform | |
(1,1,1-Trichloroethane).............| 1900 | .......
Methylcyclohexane.....................| 2000 | .......
Methylcyclohexanol....................| 470 | .......
o-Methylcyclohexanone.................| 460 | X
Methylene chloride: see 1910.1052.....| |
Methyl ethyl ketone (MEK); | |
see 2-Butanone......................| |
Methyl formate........................| 250 | .......
Methyl hydrazine | |
(Monomethyl hydrazine)..............| (C)0.35 | X
Methyl iodide.........................| 28 | X
Methyl isoamyl ketone.................| 475 | .......
Methyl isobutyl carbinol..............| 100 | X
Methyl isobutyl ketone; see Hexone....| |
Methyl isocyanate.....................| 0.05 | X
Methyl mercaptan......................| 1 | .......
Methyl methacrylate...................| 410 | .......
Methyl propyl ketone; see 2-Pentanone.| |
Methyl silicate.......................| (C)30 | .......
alpha-Methyl styrene..................| (C)480 | .......
Methylene bisphenyl isocyanate (MDI)..| (C)0.2 | .......
Methylenedianiline (MDA)..............| ....... |
Mica; see Silicates...................| |
Molybdenum (as Mo)....................| |
Soluble compounds...................| 5 | .......
Insoluble Compounds | |
Total dust........................| 15 | .......
Monomethyl aniline....................| 9 | X
Monomethyl hydrazine; | |
see Methyl hydrazine................| |
Morpholine............................| 70 | X
Naphtha (Coal tar)....................| 400 | .......
Naphthalene...........................| 50 | .......
alpha-Naphthylamine; see 1926.1104....| |
beta-Naphthylamine; see 1926.1109.....| | .......
Neon..................................| |
Nickel carbonyl (as Ni)...............| 0.007 | .......
Nickel, metal and insoluble compounds | |
(as Ni).............................| 1 | .......
Nickel, soluble compounds (as Ni).....| 1 | .......
Nicotine..............................| 0.5 | X
Nitric acid...........................| 5 | .......
Nitric oxide..........................| 30 | .......
p-Nitroaniline........................| 6 | X
Nitrobenzene..........................| 5 | X
p-Nitrochlorobenzene..................| 1 | X
4-Nitrodiphenyl; see 1926.1103........| |
Nitroethane...........................| 310 | .......
Nitrogen..............................| |
Nitrogen dioxide......................| (C)9 | .......
Nitrogen trifluoride..................| 29 | .......
Nitroglycerin.........................| (C)2 | X
Nitromethane..........................| 250 | .......
1-Nitropropane........................| 90 | .......
2-Nitropropane........................| 90 | .......
N-Nitrosodimethylamine; see 1926.1116.| | .......
Nitrotoluene (all isomers)............| 30 | X
o-isomer............................| |
m-isomer............................| |
p-isomer............................| |
Nitrotrichloromethane; | |
see Chloropicrin....................| |
Nitrous oxide.........................| |
Octachloronaphthalene.................| 0.1 | X
Octane................................| 1900 | .......
Oil mist, mineral.....................| 5 | .......
Osmium tetroxide (as Os)..............| 0.002 | .......
Oxalic acid...........................| 1 | .......
Oxygen difluoride.....................| 0.1 | .......
Ozone.................................| 0.2 | .......
Paraquat, respirable dust... .........| 0.5 | X
| |
| |
Parathion.............................| 0.1 | X
Particulates not otherwise regulated..| |
Total dust organic and inorganic....| 15 | .......
PCB; see Chlorodiphenyl | |
(42 percent and 54 percent chlorine)| |
Pentaborane...........................| 0.01 | .......
Pentachloronaphthalene................| 0.5 | X
Pentachlorophenol.....................| 0.5 | X
Pentaerythritol.......................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Pentane...............................| 1500 | .......
2-Pentanone (Methyl propyl ketone)....| 700 | .......
Perchloroethylene | |
(Tetrachloroethylene)...............| 670 | .......
Perchloromethyl mercaptan.............| 0.8 | .......
Perchloryl fluoride...................| 13.5 | .......
Petroleum distillates | |
(Naphtha)(Rubber Solvent)...........| A(3) | .......
Phenol................................| 19 | X
p-Phenylene diamine...................| 0.1 | X
Phenyl ether, vapor...................| 7 | .......
Phenyl ether-biphenyl mixture, vapor..| 7 | .......
Phenylethylene; see Styrene...........| |
Phenyl glycidyl ether (PGE)...........| 60 | .......
Phenylhydrazine.......................| 22 | X
Phosdrin (Mevinphos)..................| 0.1 | X
Phosgene (Carbonyl chloride)..........| 0.4 | .......
Phosphine.............................| 0.4 | .......
Phosphoric acid.......................| 1 | .......
Phosphorus (yellow)...................| 0.1 | .......
Phosphorus pentachloride..............| 1 | .......
Phosphorus pentasulfide...............| 1 | .......
Phosphorus trichloride................| 3 | .......
Phthalic anhydride....................| 12 | .......
Picric acid...........................| 0.1 | X
Pindone (2-Pivalyl-1, 3-indandione)...| 0.1 | .......
Plaster of paris......................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Platinum (as Pt)......................| |
Metal...............................| ....... | .......
Soluble Salts.......................| 0.002 | .......
Polytetrafluoroethylene | |
decomposition products..............| A(2) |
Portland cement.......................| |
Total dust..........................| 15 | .......
Respirable fraction.................| 5 | .......
Propane...............................| ....... |
Propargyl alcohol.....................| ....... | X
beta-Propriolactone; see 1926.1113....| |
n-Propyl acetate......................| 840 | .......
n-Propyl alcohol......................| 500 | .......
n-Propyl nitrate......................| 110 | .......
Propylene dichloride..................| 350 | .......
Propylene imine.......................| 5 | X
Propylene oxide.......................| 240 | .......
Propyne; see Methyl acetylene.........| |
Pyrethrum.............................| 5 | .......
Pyridine..............................| 15 | .......
Quinone...............................| 0.4 | .......
RDX: see Cyclonite....................| |
Rhodium (as Rh), metal fume and | |
insoluble compounds.................| 0.1 | .......
Rhodium (as Rh), soluble compounds....| 0.001 | .......
Ronnel................................| 10 | .......
Rotenone..............................| 5 | .......
Rouge.................................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Selenium compounds (as Se)............| 0.2 | .......
Selenium hexafluoride (as Se).........| 0.4 | .......
Silica, amorphous, precipitated | |
and gel.............................| (2) | (2)
Silica, amorphous, diatomaceous earth,| |
containing less than 1 percent | |
crystalline silica..................| (2) | (2)
Silica, crystalline cristobalite, | |
respirable dust.....................| (2) | (2)
Silica, crystalline quartz, | |
respirable dust.....................| (2) | (2)
Silica, crystalline tripoli | |
(as quartz), respirable dust........| (2) | (2)
Silica, crystalline tridymite, | |
respirable dust.....................| (2) | (2)
Silica, fused, respirable dust........| (2) | (2)
Silicates (less than 1 percent | |
crystalline silica) Mica | |
(respirable dust)...................| (2) | (2)
Soapstone, total dust.................| (2) | (2)
Soapstone, respirable dust............| (2) | (2)
Talc (containing asbestos); | |
use asbesto limit; see 1926.58....| |
Talc (containing no asbestos), | |
respirable dust...................| (2) | (2)
Tremolite, abestiform; see 1926.58..| |
Soapstone, total dust...............| (2) | (2)
Soapstone, respirable dust..........| (2) | (2)
Talc (containing asbestos)..........| (3) | (3)
Talc (containing no asbestos), | |
respirable dust.....................| (2) | (2)
Tremolite...........................| (1) | (1)
Silicon carbide.......................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Silver, metal and soluble compounds | |
(as Ag).............................| 0.01 | .......
Soapstone; see Silicates..............| |
Sodium fluoroacetate..................| 0.05 | X
Sodium hydroxide......................| 2 | .......
Starch................................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Stibine...............................| 0.5 | .......
Stoddard solvent......................| 1150 | .......
Strychnine............................| 0.15 | .......
Styrene...............................| (C)420 | .......
Sucrose...............................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Sulfur dioxide........................| 13 | .......
Sulfur hexafluoride...................| 6000 | .......
Sulfuric acid.........................| 1 | .......
Sulfur monochloride...................| 6 | .......
Sulfur pentafluoride..................| 0.25 | .......
Sulfuryl fluoride.....................| 20 | .......
Systox; see Demeton..................| |
2,4,5-T | |
(2,4,5-tri-chlorophenoxyacetic acid)| 10 | .......
Talc; see Silicates..................| |
Tantalum, metal and oxide dust........| 5 | .......
TEDP (Sulfotep).......................| 0.2 | X
Teflon decomposition products.........| A2 |
Tellurium and compounds (as Te).......| 0.1 | .......
Tellurium hexafluoride (as Te)........| 0.2 | .......
Temephos..............................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
TEPP (Tetraethyl pyrophosphaate)......| 0.05 | X
Terphenylis...........................| (C)9 | .......
1,1,1,2-Tetrachloro-2, | |
2-difluoroethane....................| 4170 | .......
1,1,2,2-Tetrachloro-1, | |
2-difluoroethane....................| 4170 | .......
1,1,2,2-Tetrachloroethane.............| 35 | X
Tetrachoroethylene; | |
see Perchloroethylene...............| |
Tetrachloromethane; | |
See Carbon tetrachloride............| |
Tetrachloronaphthalene................| 2 | X
Tetraethyl lead (as Pb)...............| 0.1 | X
Tetrahydrofuran.......................| 590 | .......
Tetramethyl lead, (as Pb).............| 0.15 | X
Tetramethyl succinonitrile............| 3 | X
Tetranitromethane.....................| 8 | .......
Tetryl (2,4,6-Trinitrophenylmethyl- | |
nitramine)..........................| 1.5 | X
Thallium, soluble compounds (as Tl)...| 0.1 | X
Thiram................................| 5 | .......
Tin, inorganic compounds | |
(except oxides) (as Sn).............| 2 | .......
Tin, organic compounds (as Sn)........| 0.1 | .......
Tin oxide (as Sn).....................| ....... | .......
Total dust..........................| | .......
Respirable fraction.................| | .......
Titanium dioxide......................| |
Total dust..........................| | .......
Toluene...............................| 750 | .......
Toluene-2, 4-diisocyanate (TDI).......| (C)0.14 | .......
o-Toluidine...........................| 22 | X
Toxaphene; see Chlorinated camphene..| |
Tremolite; see Silicates..............| |
Tributyl phosphate....................| 5 | .......
1,1,1-Trichloroethane; | |
see Methyl chloroform...............| |
1,1,2-Trichloroethane.................| 45 | X
Trichloroethylene.....................| 535 | .......
Trichloromethane; see Chloroform | |
Trichloronaphthalene..................| 5 | X
1,2,3-Trichloropropane................| 300 | .......
1,1,2-Trichloro-1,2, 2-trifluoroethane| 7600 | .......
Triethylamine.........................| 100 | .......
Trifluorobromomethane.................| 6100 | .......
Trimethyl benzene.....................| 120 | .......
2,4,6-Trinitrophenol; see Picric acid.| |
2,4,6-Trinitrophenylmethyl nitramine; | |
see Tetryl..........................| |
2,4,6-Trinitrotoluene (TNT)...........| 1.5 | X
Triorthocresyl phosphate..............| 0.1 | .......
Triphenyl phosphate...................| 3 | .......
Tungsten (as W).......................| |
Insoluble compounds.................| 5 | .......
Soluble compounds...................| 1 | .......
Turpentine............................| 560 | .......
Uranium (as U)........................| |
Soluble compounds...................| 0.2 | .......
Insoluble compounds.................| 0.2 | .......
Vanadium..............................| |
Respirable dust (as V(2)O(5)).......| (C)0.5 | .......
Fume (as V(2)O(5))..................| (C)0.1 | .......
Vegetable oil mist....................| |
Total dust..........................| | .......
Respirable fraction.................| | .......
Vinyl benzene; see Styrene............| |
Vinyl chloride; see 1926.1117.........| |
Vinyl cyanide; see Acrylonitrile......| |
Vinyl toluene.........................| 480 | .......
Warfarin..............................| 0.1 | .......
Xylenes (o-, m-, p-isomers)...........| 435 | .......
Xylidine..............................| 25 | X
Yttrium...............................| 1 | .......
Zinc chloride fume....................| 1 | .......
Zinc oxide fume.......................| 5 | .......
Zinc oxide............................| |
Total dust..........................| 15 | .......
Respirable fraction.................| 5 | .......
Zirconium compounds (as Zr)...........| 5 |
______________________________________|________________|__________
MINERAL DUSTS
_________________________________________________________________
|
Substance | mppcf(j)
______________________________________________|__________________
|
SILICA: |
Crystalline |
Quartz. Threshold limit calculated from the |
formula.....................................| 250(k)
|__________________
|
| percent SiO(2)+5
Cristobalite. |
Amorphous, including natural diatomaceous |
earth.....................................| 20
SILICATES (less than 1 percent crystalline |
silica) |
Mica........................................| 20
Portland cement.............................| 50
Soapstone...................................| 20
Talc (non-asbestiform)......................| 20
Talc (fibrous), use asbestos limit..........| --
Graphite (natural)............................| 15
______________________________________________|__________________
|
Inert or Nuisance Particulates:(m): | 50 (or 15 mg/m(3)
"[*Inert or Nuisance Dusts includes all | whichever is the
mineral, inorganic, and organic dusts | the smaller) of
as indicated by examples in TLV's | total dust less
Appendix D]" | than 1 percent
| SiO(2)
Conversion factors. |
mppcf X 35.3 = million particles per cubic |
meter = particles per c.c. |
______________________________________________|_________________
Footnote(1) [Reserved]
Footnote(2) See Mineral Dusts Table.
Footnote(3) Use Asbestos Limit 1926.58.
Footnote(4) See 1926.58
Footnote(*) The PELs are 8-hour TWAs unless otherwise noted; a
(C) designation denotes a ceiling limit.
Footnote(**) As determined from breathing-zone air samples.
Footnote(a) Parts of vapor or gas per million parts of contaminated
air by volume at 25 degrees C and 760 torr.
Footnote(b) Milligrams of substance per cubic meter of air. When
entry is in this column only, the value is exact; when listed with a
ppm entry, it is approximate.
Footnote(c) [Reserved]
Footnote(d) The CAS number is for information only. Enforcement is
based on the substance name. For an entry covering more than one
metal compound, measured as the metal, the CAS number for the metal
is given - not CAS numbers for the individual compounds.
Footnote(e) [Reserved]
Footnote(f) [Reserved]
Footnote(g) For sectors excluded from 1926.1128 the limit is 10 ppm
TWA.
Footnote(h) [Removed]
Footnote(i) [Reserved]
Footnote(j) Millions of particles per cubic foot of air, based on
impinger samples counted by light-field techniques.
Footnote(k) The percentage of crystalline silica in the formula is
the amount determined from airborne samples, except in those
instances in which other methods have been shown to be applicable.
Footnote(l) [Reserved]
Footnote(m) Covers all organic and inorganic particulates not
otherwise regulated. Same as Particulates Not Otherwise Regulated.
The 1970 TLV uses letter designations instead of a numerical value
as follows:
Footnote(A(1)) [Reserved]
Footnote(A(2)) Polytetrafluoroethylene decomposition products.
Because these products decompose in part by hydrolysis in alkaline
solution, they can be quantitatively determined in air as fluoride to
provide an index of exposure. No TLV is recommended pending
determination of the toxicity of the products, but air concentrations
should be minimal.
Footnote(A(3)) Gasoline and/or Petroleum
distillates. The composition of these materials varies greatly and
thus a single TLV for all types of these materials is no longer
applicable. The content of benzene, other aromatics and additives
should be determined to arrive at the appropriate TLV.
Footnote(E) Simple asphyxiants. The limiting factor is the
available oxygen which shall be at least 19.5 percent and be within
the requirements addressing explosion in part 1926.
[39 FR 22801, June 24, 1974, as amended at 51 FR 37007, Oct. 17, 1986; 52 FR 46312, Dec 4, 1987; 58 FR 35089, June 30, 1993; 61 FR 9227,
March 7, 1996; 61 FR 56746, Nov. 4, 1996; 62 FR 1493, Jan. 10, 1997]
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