| |
|
Substance |
Original IDLH
Value |
Revised IDLH
Value |
|
Acetaldehyde |
10,000 ppm |
2,000 ppm |
|
Acetic acid |
1,000 ppm |
50 ppm |
|
Acetic anhydride |
1,000 ppm |
200 ppm |
|
Acetone |
20,000 ppm |
2,500 ppm [LEL] |
|
Acetonitrile |
4,000 ppm |
500 ppm |
|
Acetylene tetrabromide |
10 ppm |
8 ppm |
|
Acrolein |
5 ppm |
2 ppm |
|
Acrylamide |
Unknown |
60 mg/m3 |
|
Acrylonitrile |
500 ppm |
85 ppm |
|
Aldrin |
100 mg/m3 |
25 mg/m3 |
|
Allyl alcohol |
150 ppm |
20 ppm |
|
Allyl chloride |
300 ppm |
250 ppm |
|
Allyl glycidyl ether |
270 ppm |
50 ppm |
|
2 Aminopyridine |
5 ppm |
5 ppm [Unch] |
|
Ammonia |
500 ppm |
300 ppm |
|
Ammonium sulfamate |
5,000 mg/m3 |
1,500 mg/m3 |
|
n-Amyl acetate |
4,000 ppm |
1,000 ppm |
|
sec-Amyl acetate |
9,000 ppm |
1,000 ppm |
|
Aniline |
100 ppm |
100 ppm [Unch] |
|
o-Anisidine |
50 mg/m3 |
50 mg/m3 [Unch] |
|
p-Anisidine |
50 mg/m3 |
50 mg/m3 [Unch] |
|
Antimony compounds (as Sb) |
80 mg Sb/m3 |
50 mg Sb/m3 |
|
ANTU |
100 mg/m3 |
100 mg/m3 [Unch] |
|
Arsenic (inorganic compounds, as As) |
100 mg As/m3 |
5 mg As/m3 |
|
Arsine |
6 ppm |
3 ppm |
|
Azinphosmethyl |
20 mg/m3 |
10 mg/m3 |
|
Barium (soluble compounds, as Ba) |
1,100 mg Ba/m3 |
50 mg Ba/m3 |
|
Benzene |
3,000 ppm |
500 ppm |
|
Benzoyl peroxide |
7,000 mg/m3 |
1,500 mg/m3 |
|
Benzyl chloride |
10 ppm |
10 ppm [Unch] |
|
Beryllium compounds (as Be) |
10 mg Be/m3 |
4 mg Be/m3 |
|
Boron oxide |
N.E. |
2,000 mg/m3 |
|
Boron trifluoride |
100 ppm |
25 ppm |
|
Bromine |
10 ppm |
3 ppm |
|
Bromoform |
Unknown |
850 ppm |
|
1,3-Butadiene |
20,000 ppm [LEL] |
2,000 ppm [LEL] |
|
2-Butanone |
3,000 ppm |
3,000 ppm [Unch] |
|
2-Butoxyethanol |
700 ppm |
700 ppm [Unch] |
|
n-Butyl acetate |
10,000 ppm |
1,700 ppm [LEL] |
|
sec-Butyl acetate |
10,000 ppm |
1,700 ppm [LEL] |
|
tert-Butyl acetate |
10,000 ppm |
1,500 ppm [LEL] |
|
n-Butyl alcohol |
8,000 ppm |
1,400 ppm [LEL] |
|
sec-Butyl alcohol |
10,000 ppm |
2,000 ppm |
|
tert-Butyl alcohol |
8,000 ppm |
1,600 ppm |
|
n-Butylamine |
2,000 ppm |
300 ppm |
|
tert-Butyl chromate |
30 mg/m3 (as CrO3) |
15 mg Cr(VI)/m3 |
|
n-Butyl glycidyl ether |
3,500 ppm |
250 ppm |
|
n-Butyl mercaptan |
2,500 ppm |
500 ppm |
|
p-tert-Butyltoluene |
1,000 ppm |
100 ppm |
|
Cadmium dust (as Cd) |
50 mg Cd/m3 |
9 mg Cd/m3 |
|
Cadmium fume (as Cd) |
9 mg Cd/m3 |
9 mg Cd/m3[Unc h] |
|
Calcium arsenate (as As) |
100 mg As/m3 |
5 mg As/m3 |
|
Calcium oxide |
Unknown |
25 mg/m3 |
|
Camphor (synthetic) |
200 mg/m3 |
200 mg/m3 [Unch] |
|
Carbaryl |
600 mg/m3 |
100 mg/m3 |
|
Carbon black |
N.E. |
1,750 mg/m3 |
|
Carbon dioxide |
50,000 ppm |
40,000 ppm |
|
Carbon disulfide |
500 ppm |
500 ppm [Unch] |
|
Carbon monoxide |
1,500 ppm |
1,200 ppm |
|
Carbon tetrachloride |
300 ppm |
200 ppm |
|
Chlordane |
500 mg/m3 |
100 mg/m3 |
|
Chlorinated camphene |
200 mg/m3 |
200 mg/m3 [Unch] |
|
Chlorinated diphenyl oxide |
Unknown |
5 mg/m3 |
|
Chlorine |
30 ppm |
10 ppm |
|
Chlorine dioxide |
10 ppm |
5 ppm |
|
Chlorine trifluoride |
20 ppm |
20 ppm [Unch] |
|
Chloroacetaldehyde |
100 ppm |
45 ppm |
|
alpha-Chloroacetophenone |
100 mg/m3 |
15 mg/m3 |
|
Chlorobenzene |
2,400 ppm |
1,000 ppm |
|
o-Chlorobenzylidene malononitrile |
2 mg/m3 |
2 mg/m3 [Unch] |
|
Chlorobromomethane |
5,000 ppm |
2,000 ppm |
|
Chlorodiphenyl (42% chlorine) |
10 mg/m3 |
5 mg/m3 |
|
Chlorodiphenyl (54% chlorine) |
5 mg/m3 |
5 mg/m3 [Unch] |
|
Chloroform |
1,000 ppm |
500 ppm |
|
1-Chloro-1-nitropropane |
2,000 ppm |
100 ppm |
|
Chloropicrin |
4 ppm |
2 ppm |
|
beta-Chloroprene |
400 ppm |
300 ppm |
|
Chromic acid and chromates |
30 mg/m3 (as CrO3) |
15 mg Cr(VI)/m3 |
|
Chromium (II) compounds [as Cr(II)] |
N.E. |
250 mg Cr(II)/m3 |
|
Chromium (III) compounds [as Cr(III)] |
N.E. |
25 mg Cr(III)/m3 |
|
Chromium metal (as Cr) |
N.E. |
250 mg Cr/m3 |
|
Coal tar pitch volatiles |
700 mg/m3 |
80 mg/m3 |
|
Cobalt metal, dust and fume (as Co) |
20 mg Co/m3 |
20 mg Co/m3 [Unch] |
|
Copper (dusts and mists, as Cu) |
N.E. |
100 mg Cu/m3 |
|
Copper fume (as Cu) |
N.E. |
100 mg Cu/m3 |
|
Cotton dust (raw) |
N.E. |
100 mg/m3 |
|
Crag (r) herbicide |
5,000 mg/m3 |
500 mg/m3 |
|
Cresol (o, m, p isomers) |
250 ppm |
250 ppm [Unch] |
|
Crotonaldehyde |
400 ppm |
50 ppm |
|
Cumene |
8,000 ppm |
900 ppm [LEL] |
|
Cyanides (as CN) |
50 mg/m3 (as CN) |
25 mg/m3 (as CN) |
|
Cyclohexane |
10,000 ppm |
1,300 ppm [LEL] |
|
Cyclohexanol |
3,500 ppm |
400 ppm |
|
Cyclohexanone |
5,000 ppm |
700 ppm |
|
Cyclohexene |
10,000 ppm |
2,000 ppm |
|
Cyclopentadiene |
2,000 ppm |
750 ppm |
|
2,4-D |
500 mg/m3 |
100 mg/m3 |
|
DDT |
N.E. |
500 mg/m3 |
|
Decaborane |
100 mg/m3 |
15 mg/m3 |
|
Demeton |
20 mg/m3 |
10 mg/m3 |
|
Diacetone alcohol |
2,100 ppm |
1,800 ppm [LEL] |
|
Diazomethane |
2 ppm |
2 ppm [Unch] |
|
Diborane |
40 ppm |
15 ppm |
|
Dibutyl phosphate |
125 ppm |
30 ppm |
|
Dibutyl phthalate |
9,300 mg/m3 |
4,000 mg/m3 |
|
o-Dichlorobenzene |
1,000 ppm |
200 ppm |
|
p-Dichlorobenzene |
1,000 ppm |
150 ppm |
|
Dichlorodifluoromethane |
50,000 ppm |
15,000 ppm |
|
1,3-Dichloro 5,5-dimethylhydantoin |
Unknown |
5 mg/m3 |
|
1,1-Dichloroethane |
4,000 ppm |
3,000 ppm |
|
1,2-Dichloroethylene |
4,000 ppm |
1,000 ppm |
|
Dichloroethyl ether |
250 ppm |
100 ppm |
|
Dichloromonofluoromethane |
50,000 ppm |
5,000 ppm |
|
1,1-Dichloro 1-nitroethane |
150 ppm |
25 ppm |
|
Dichlorotetrafluoroethane |
50,000 ppm |
15,000 ppm |
|
Dichlorvos |
200 mg/m3 |
100 mg/m3 |
|
Dieldrin |
450 mg/m3 |
50 mg/m3 |
|
Diethylamine |
2,000 ppm |
200 ppm |
|
2-Diethylaminoethanol |
500 ppm |
100 ppm |
|
Difluorodibromomethane |
2,500 ppm |
2,000 ppm |
|
Diglycidyl ether |
25 ppm |
10 ppm |
|
Diisobutyl ketone |
2,000 ppm |
500 ppm |
|
Diisopropylamine |
1,000 ppm |
200 ppm |
|
Dimethyl acetamide |
400 ppm |
300 ppm |
|
Dimethylamine |
2,000 ppm |
500 ppm |
|
N,N-Dimethylaniline |
100 ppm |
100 ppm [Unch] |
|
Dimethyl 1,2-dibromo 2,2-dichlorethyl phosphate |
1,800 mg/m3 |
200 mg/m3 |
|
Dimethylformamide |
3,500 ppm |
500 ppm |
|
1,1-Dimethylhydrazine |
50 ppm |
15 ppm |
|
Dimethylphthalate |
9,300 mg/m3 |
2,000 mg/m3 |
|
Dimethyl sulfate |
10 ppm |
7 ppm |
|
Dinitrobenzene (o, m, p isomers) |
200 mg/m3 |
50 mg/m3 |
|
Dinitroocresol |
5 mg/m3 |
5 mg/m3 [Unch] |
|
Dinitrotoluene |
200 mg/m3 |
50 mg/m3 |
|
Di sec-octyl phthalate |
Unknown |
5,000 mg/m3 |
|
Dioxane |
2,000 ppm |
500 ppm |
|
Diphenyl |
300 mg/m3 |
100 mg/m3 |
|
Dipropylene glycol methyl ether |
Unknown |
600 ppm |
|
Endrin |
2,000 mg/m3 |
2 mg/m3 |
|
Epichlorohydrin |
250 ppm |
75 ppm |
|
EPN |
50 mg/m3 |
5 mg/m3 |
|
Ethanolamine |
1,000 ppm |
30 ppm |
|
2-Ethoxyethanol |
6,000 ppm |
500 ppm |
|
2-Ethoxyethyl acetate |
2,500 ppm |
500 ppm |
|
Ethyl acetate |
10,000 ppm |
2,000 ppm [LEL] |
|
Ethyl acrylate |
2,000 ppm |
300 ppm |
|
Ethyl alcohol |
15,000 ppm |
3,300 ppm [LEL] |
|
Ethylamine |
4,000 ppm |
600 ppm |
|
Ethyl benzene |
2,000 ppm |
800 ppm [LEL] |
|
Ethyl bromide |
3,500 ppm |
2,000 ppm |
|
Ethyl butyl ketone |
3,000 ppm |
1,000 ppm |
|
Ethyl chloride |
20,000 ppm |
3,800 ppm [LEL] |
|
Ethylene chlorohydrin |
10 ppm |
7 ppm |
|
Ethylenediamine |
2,000 ppm |
1,000 ppm |
|
Ethylene dibromide |
400 ppm |
100 ppm |
|
Ethylene dichloride |
1,000 ppm |
50 ppm |
|
Ethylene glycol dinitrate |
500 mg/m3 |
75 mg/m3 |
|
Ethyleneimine |
100 ppm |
100 ppm [Unch] |
|
Ethylene oxide |
800 ppm |
800 ppm [Unch] |
|
Ethyl ether |
19,000 ppm [LEL] |
1,900 ppm [LEL] |
|
Ethyl formate |
8,000 ppm |
1,500 ppm |
|
Ethyl mercaptan |
2,500 ppm |
500 ppm |
|
N-Ethylmorpholine |
2,000 ppm |
100 ppm |
|
Ethyl silicate |
1,000 ppm |
700 ppm |
|
Ferbam |
N.E. |
800 mg/m3 |
|
Ferrovanadium dust |
N.E. |
500 mg/m3 |
|
Fluorides (as F) |
500 mg F/m3 |
250 mg F/m3 |
|
Fluorine |
25 ppm |
25 ppm [Unch] |
|
Fluorotrichloromethane |
10,000 ppm |
2,000 ppm |
|
Formaldehyde |
30 ppm |
20 ppm |
|
Formic acid |
30 ppm |
30 ppm [Unch] |
|
Furfural |
250 ppm |
100 ppm |
|
Furfuryl alcohol |
250 ppm |
75 ppm |
|
Glycidol |
500 ppm |
150 ppm |
|
Graphite (natural) |
N.E. |
1,250 mg/m3 |
|
Hafnium compounds (as Hf) |
Unknown |
50 mg Hf/m3 |
|
Heptachlor |
700 mg/m3 |
35 mg/m3 |
|
n-Heptane |
5,000 ppm |
750 ppm |
|
Hexachloroethane |
300 ppm |
300 ppm [Unch] |
|
Hexachloronaphthalene |
2 mg/m3 |
2 mg/m3 [Unch] |
|
n-Hexane |
5,000 ppm |
1,100 ppm [LEL] |
|
2-Hexanone |
5,000 ppm |
1,600 ppm |
|
Hexone |
3,000 ppm |
500 ppm |
|
sec Hexyl acetate |
4,000 ppm |
500 ppm |
|
Hydrazine |
80 ppm |
50 ppm |
|
Hydrogen bromide |
50 ppm |
30 ppm |
|
Hydrogen chloride |
100 ppm |
50 ppm |
|
Hydrogen cyanide |
50 ppm |
50 ppm [Unch] |
|
Hydrogen fluoride (as F) |
30 ppm |
30 ppm [Unch] |
|
Hydrogen peroxide |
75 ppm |
75 ppm [Unch] |
|
Hydrogen selenide (as Se) |
2 ppm |
1 ppm |
|
Hydrogen sulfide |
300 ppm |
100 ppm |
|
Hydroquinone |
Unknown |
50 mg/m3 |
|
Iodine |
10 ppm |
2 ppm |
|
Iron oxide dust and fume (as Fe) |
N.E. |
2,500 mg Fe/m3 |
|
Isoamyl acetate |
3,000 ppm |
1,000 ppm |
|
Isoamyl alcohol (primary and secondary) |
10,000 ppm |
500 ppm |
|
Isobutyl acetate |
7,500 ppm |
1,300 ppm [LEL] |
|
Isobutyl alcohol |
8,000 ppm |
1,600 ppm |
|
Isophorone |
800 ppm |
200 ppm |
|
Isopropyl acetate |
16,000 ppm |
1,800 ppm |
|
Isopropyl alcohol |
12,000 ppm |
2,000 ppm [LEL] |
|
Isopropylamine |
4,000 ppm |
750 ppm |
|
Isopropyl ether |
10,000 ppm |
1,400 ppm [LEL] |
|
Isopropyl glycidyl ether |
1,000 ppm |
400 ppm |
|
Ketene |
Unknown |
5 ppm |
|
Lead compounds (as Pb) |
700 mg Pb/m3 |
100 mg Pb/m3 |
|
Lindane |
1,000 mg/m3 |
50 mg/m3 |
|
Lithium hydride |
55 mg/m3 |
0.5 mg/m3 |
|
L.P.G. |
19,000 ppm [LEL] |
2,000 ppm [LEL] |
|
Magnesium oxide fume |
N.E. |
750 mg/m3 |
|
Malathion |
5,000 mg/m3 |
250 mg/m3 |
|
Maleic anhydride |
Unknown |
10 mg/m3 |
|
Manganese compounds (as Mn) |
N.E. |
500 mg Mn/m3 |
|
Mercury compounds [except (organo) alkyls, as Hg] |
28 mg Hg/m3 |
10 mg Hg/m3 |
|
Mercury (organo) alkyl compounds(as Hg) |
10 mg Hg/m3 |
2 mg Hg/m3 |
|
Mesityl oxide |
5,000 ppm |
1,400 ppm [LEL] |
|
Methoxychlor |
N.E. |
5,000 mg/m3 |
|
Methyl acetate |
10,000 ppm |
3,100 ppm [LEL] |
|
Methyl acetylene |
15,000 ppm [LEL] |
1,700 ppm [LEL] |
|
Methyl acetylenepropadiene mixture |
15,000 ppm |
3,400 ppm [LEL] |
|
Methyl acrylate |
1,000 ppm |
250 ppm |
|
Methylal |
15,000 ppm [LEL] |
2,200 ppm [LEL] |
|
Methyl alcohol |
25,000 ppm |
6,000 ppm |
|
Methylamine |
100 ppm |
100 ppm [Unch] |
|
Methyl (namyl) ketone |
4,000 ppm |
800 ppm |
|
Methyl bromide |
2,000 ppm |
250 ppm |
|
Methyl Cellosolve (r) |
2,000 ppm |
200 ppm |
|
Methyl Cellosolve (r) acetate |
4,000 ppm |
200 ppm |
|
Methyl chloride |
10,000 ppm |
2,000 ppm |
|
Methyl chloroform |
1,000 ppm |
700 ppm |
|
Methylcyclohexane |
10,000 ppm |
1,200 ppm [LEL] |
|
Methylcyclohexanol |
10,000 ppm |
500 ppm |
|
o-Methylcyclohexanone |
2,500 ppm |
600 ppm |
|
Methylene bisphenyl isocyanate |
100 mg/m3 |
75 mg/m3 |
|
Methylene chloride |
5,000 ppm |
2,300 ppm |
|
Methyl formate |
5,000 ppm |
4,500 ppm |
|
5-Methyl 3-heptanone |
3,000 ppm |
100 ppm |
|
Methyl hydrazine |
50 ppm |
20 ppm |
|
Methyl iodide |
800 ppm |
100 ppm |
|
Methyl isobutyl carbinol |
2,000 ppm |
400 ppm |
|
Methyl isocyanate |
20 ppm |
3 ppm |
|
Methyl mercaptan |
400 ppm |
150 ppm |
|
Methyl methacrylate |
4,000 ppm |
1,000 ppm |
|
Methyl styrene |
5,000 ppm |
700 ppm |
|
Mica |
N.E. |
1,500 mg/m3 |
|
Molybdenum (insoluble compounds, as Mo) |
N.E. |
5,000 mg Mo/m3 |
|
Molybdenum (soluble compounds, as Mo) |
N.E. |
1,000 mg Mo/m3 |
|
Monomethyl aniline |
100 ppm |
100 ppm [Unch] |
|
Morpholine |
8,000 ppm |
1,400 ppm [LEL] |
|
Naphtha (coal tar) |
10,000 ppm [LEL] |
1,000 ppm [LEL] |
|
Naphthalene |
500 ppm |
250 ppm |
|
Nickel carbonyl (as Ni) |
7 ppm |
2 ppm |
|
Nickel metal and other compounds (as Ni) |
N.E. |
10 mg Ni/m3 |
|
Nicotine |
35 mg/m3 |
5 mg/m3 |
|
Nitric acid |
100 ppm |
25 ppm |
|
Nitric oxide |
100 ppm |
100 ppm [Unch] |
|
p-Nitroaniline |
300 mg/m3 |
300 mg/m3 [Unch] |
|
Nitrobenzene |
200 ppm |
200 ppm [Unch] |
|
p-Nitrochlorobenzene |
1,000 mg/m3 |
100 mg/m3 |
|
Nitroethane |
1,000 ppm |
1,000 ppm [Unch] |
|
Nitrogen dioxide |
50 ppm |
20 ppm |
|
Nitrogen trifluoride |
2,000 ppm |
1,000 ppm |
|
Nitroglycerine |
500 mg/m3 |
75 mg/m3 |
|
Nitromethane |
1,000 ppm |
750 ppm |
|
1-Nitropropane |
2,300 ppm |
1,000 ppm |
|
2-Nitropropane |
2,300 ppm |
100 ppm |
|
Nitrotoluene (o, m, p isomers) |
200 ppm |
200 ppm [Unch] |
|
Octachloronaphthalene |
Unknown |
Unknown [Unch] |
|
Octane |
5,000 ppm |
1,000 ppm [LEL] |
|
Oil mist (mineral) |
N.E. |
2,500 mg/m3 |
|
Osmium tetroxide (as Os) |
1 mg Os/m3 |
1 mg Os/m3 [Unch] |
|
Oxalic acid |
500 mg/m3 |
500 mg/m3 [Unch] |
|
Oxygen difluoride |
0.5 ppm |
0.5 ppm [Unch] |
|
Ozone |
10 ppm |
5 ppm |
|
Paraquat |
1.5 mg/m3 |
1 mg/m3 |
|
Parathion |
20 mg/m3 |
10 mg/m3 |
|
Pentaborane |
3 ppm |
1 ppm |
|
Pentachloronaphthalene |
Unknown |
Unknown [Unch] |
|
Pentachlorophenol |
150 mg/m3 |
2.5 mg/m3 |
|
n-Pentane |
15,000 ppm [LEL] |
1,500 ppm [LEL] |
|
2-Pentanone |
5,000 ppm |
1,500 ppm |
|
Perchloromethyl mercaptan |
10 ppm |
10 ppm [Unch] |
|
Perchloryl fluoride |
385 ppm |
100 ppm |
|
Petroleum distillates (naphtha) |
10,000 ppm |
1,100 ppm [LEL] |
|
Phenol |
250 ppm |
250 ppm [Unch] |
|
p-Phenylene diamine |
Unknown |
25 mg/m3 |
|
Phenyl ether (vapor) |
N.E. |
100 ppm |
|
Phenyl etherbiphenyl mixture (vapor) |
N.E. |
10 ppm |
|
Phenyl glycidyl ether |
Unknown |
100 ppm |
|
Phenylhydrazine |
295 ppm |
15 ppm |
|
Phosdrin |
4 ppm |
4 ppm [Unch] |
|
Phosgene |
2 ppm |
2 ppm [Unch] |
|
Phosphine |
200 ppm |
50 ppm |
|
Phosphoric acid |
10,000 mg/m3 |
1,000 mg/m3 |
|
Phosphorus (yellow) |
N.E. |
5 mg/m3 |
|
Phosphorus pentachloride |
200 mg/m3 |
70 mg/m3 |
|
Phosphorus pentasulfide |
750 mg/m3 |
250 mg/m3 |
|
Phosphorus trichloride |
50 ppm |
25 ppm |
|
Phthalic anhydride |
10,000 mg/m3 |
60 mg/m3 |
|
Picric acid |
100 mg/m3 |
75 mg/m3 |
|
Pindone |
200 mg/m3 |
100 mg/m3 |
|
Platinum (soluble salts, as Pt) |
N.E. |
4 mg Pt/m3 |
|
Portland cement |
N.E. |
5,000 mg/m3 |
|
Propane |
20,000 ppm [LEL] |
2,100 ppm [LEL] |
|
n-Propyl acetate |
8,000 ppm |
1,700 ppm |
|
n-Propyl alcohol |
4,000 ppm |
800 ppm |
|
Propylene dichloride |
2,000 ppm |
400 ppm |
|
Propylene imine |
500 ppm |
100 ppm |
|
Propylene oxide |
2,000 ppm |
400 ppm |
|
n-Propyl nitrate |
2,000 ppm |
500 ppm |
|
Pyrethrum |
5,000 mg/m3 |
5,000 mg/m3 [Unch] |
|
Pyridine |
3,600 ppm |
1,000 ppm |
|
Quinone |
300 mg/m3 |
100 mg/m3 |
|
Rhodium (metal fume and insoluble compounds, as
Rh) |
N.E. |
100 mg Rh/m3 |
|
Rhodium (soluble compounds, as Rh) |
N.E. |
2 mg Rh/m3 |
|
Ronnel |
5,000 mg/m3 |
300 mg/m3 |
|
Rotenone |
Unknown |
2,500 mg/m3 |
|
Selenium compounds (as Se) |
Unknown |
1 mg Se/m3 |
|
Selenium hexafluoride |
5 ppm |
2 ppm |
|
Silica, amorphous |
N.E. |
3,000 mg/m3 |
|
Silica, crystalline (respirable dust) |
N.E. |
|
|
cristobalite/tridymite: |
|
25 mg/m3 |
|
quartz/tripoli: |
|
50 mg/m3 |
|
Silver (metal dust and soluble compounds, as
Ag) |
N.E. |
10 mg Ag/m3 |
|
Soapstone |
N.E. |
3,000 mg/m3 |
|
Sodium fluoroacetate |
5 mg/m3 |
2.5 mg/m3 |
|
Sodium hydroxide |
250 mg/m3 |
10 mg/m3 |
|
Stibine |
40 ppm |
5 ppm |
|
Stoddard solvent |
29,500 mg/m3 |
20,000 mg/m3 |
|
Strychnine |
3 mg/m3 |
3 mg/m3 [Unch] |
|
Styrene |
5,000 ppm |
700 ppm |
|
Sulfur dioxide |
100 ppm |
100 ppm [Unch] |
|
Sulfuric acid |
80 mg/m3 |
15 mg/m3 |
|
Sulfur monochloride |
10 ppm |
5 ppm |
|
Sulfur pentafluoride |
1 ppm |
1 ppm [Unch] |
|
Sulfuryl fluoride |
1,000 ppm |
200 ppm |
|
2,4,5-T |
Unknown |
250 mg/m3 |
|
Talc |
N.E. |
1,000 mg/m3 |
|
Tantalum (metal and oxide dust, as Ta) |
N.E. |
2,500 mg Ta/m3 |
|
TEDP |
35 mg/m3 |
10 mg/m3 |
|
Tellurium compounds (as Te) |
N.E. |
25 mg Te/m3 |
|
Tellurium hexafluoride |
1 ppm |
1 ppm [Unch] |
|
TEPP |
10 mg/m3 |
5 mg/m3 |
|
Terphenyl (o, m, p isomers) |
Unknown |
500 mg/m3 |
|
1,1,1,2-Tetrachloro 2,2-difluoroethane |
15,000 ppm |
2,000 ppm |
|
1,1,2,2-Tetrachloro 1,2-difluoroethane |
15,000 ppm |
2,000 ppm |
|
1,1,2,2-Tetrachloroethane |
150 ppm |
100 ppm |
|
Tetrachloroethylene |
500 ppm |
150 ppm |
|
Tetrachloronaphthalene |
Unknown |
Unknown [Unch] |
|
Tetraethyl lead (as Pb) |
40 mg Pb/m3 |
40 mg Pb/m3 [Unch] |
|
Tetrahydrofuran |
20,000 ppm [LEL] |
2,000 ppm [LEL] |
|
Tetramethyl lead (as Pb) |
40 mg Pb/m3 |
40 mg Pb/m3 [Unch] |
|
Tetramethyl succinonitrile |
5 ppm |
5 ppm [Unch] |
|
Tetranitromethane |
5 ppm |
4 ppm |
|
Tetryl |
N.E. |
750 mg/m3 |
|
Thallium (soluble compounds, as Tl) |
20 mg Tl/m3 |
15 mg Tl/m3 |
|
Thiram |
1,500 mg/m3 |
100 mg/m3 |
|
Tin (inorganic compounds, as Sn) |
400 mg Sn/m3 |
100 mg Sn/m3 |
|
Tin (organic compounds, as Sn) |
Unknown |
25 mg Sn/m3 |
|
Titanium dioxide |
N.E. |
5,000 mg/m3 |
|
Toluene |
2,000 ppm |
500 ppm |
|
Toluene 2,4-diisocyanate |
10 ppm |
2.5 ppm |
|
o-Toluidine |
100 ppm |
50 ppm |
|
Tributyl phosphate |
125 ppm |
30 ppm |
|
1,1,2-Trichloroethane |
500 ppm |
100 ppm |
|
Trichloroethylene |
1,000 ppm |
1,000 ppm [Unch] |
|
Trichloronaphthalene |
Unknown |
Unknown [Unch] |
|
1,2,3-Trichloropropane |
1,000 ppm |
100 ppm |
|
1,1,2-Trichloro 1,2,2-trifluoroethane |
4,500 ppm |
2,000 ppm |
|
Triethylamine |
1,000 ppm |
200 ppm |
|
Trifluorobromomethane |
50,000 ppm |
40,000 ppm |
|
2,4,6-Trinitrotoluene |
1,000 mg/m3 |
500 mg/m3 |
|
Triorthocresyl phosphate |
40 mg/m3 |
40 mg/m3 [Unch] |
|
Triphenyl phosphate |
N.E. |
1,000 mg/m3 |
|
Turpentine |
1,500 ppm |
800 ppm |
|
Uranium (insoluble compounds, as U) |
30 mg U/m3 |
10 mg U/m3 |
|
Uranium (soluble compounds, as U) |
20 mg U/m3 |
10 mg U/m3 |
|
Vanadium dust |
70 mg/m3 (as V2O5) |
35 mg V/m3 |
|
Vanadium fume |
70 mg/m3 (as V2O5) |
35 mg V/m3 |
|
Vinyl toluene |
5,000 ppm |
400 ppm |
|
Warfarin |
350 mg/m3 |
100 mg/m3 |
|
Xylene (o, m, p isomers) |
1,000 ppm |
900 ppm |
|
Xylidine |
150 ppm |
50 ppm |
|
Yttrium compounds (as Y) |
N.E. |
500 mg Y/m3 |
|
Zinc chloride fume |
4,800 mg/m3 |
50 mg/m3 |
|
Zinc oxide |
2,500 mg/m3 |
500 mg/m3 |
|
Zirconium compounds (as Zr) |
500 mg Zr/m3 |
25 mg Zr/m3 |
|
 |
|
