Revised: 9/1/13
Quick Tips #232
References:
NIOSH Pocket Guide to Chemical Hazards, NIOSH, 2005
Definitions:
TLV (threshold limit value)-An estimate of the average safe airborne concentration of a substance in representative conditions under which it is believed that nearly all workers may be repeatedly exposed day after day without adverse effect. TLVs are published annually by the American Conference of Governmental Industrial Hygienists (ACGIH).
PEL (permissible exposure limit)-The OSHA limits of employee exposure to chemicals; found primarily in 29 CFR 1910.1000, table Z-1.
STEL (short term exposure limit)-The maximum concentration for a continuous 15-minute exposure period. Ceiling is the maximum allowable concentration to which an employee may be exposed.
IDLH (immediately dangerous to life and health)-The concentration of an airborne chemical which may cause irreversible health effects or death. NIOSH
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Acetaldehyde | - | 200 | 25 ACGIH | 2000 ++ |
Acetic acid | 10 | 10 | 15 ACGIH | 50 |
Acetic anhydride | 5 | 5 | 5 NIOSH | 200 |
Acetone | 500 | 1000 | 750 ACGIH | 2500 |
Acetonitrile | 20 | 40 | - | 500 |
Acetylene tetrabromide (1,1,2,2 Tetrabromoethane) | 0.1 | 1 | - | 8 |
Acrolein | - | 0.1 | 0.1 ACGIH | 2 |
Acrylamide | 0.03 | 0.3 mg/m3 | - | 60 mg/m3++ |
Aldrin | 0.05 | 0.25 mg/m3 | - | 25 mg/m3++ |
Allyl alcohol | 0.5 | 2 | 4 NIOSH | 20 |
Allyl chloride | 1 | 1 | 2 ACGIH / NIOSH | 250 |
Allyl glycidyl ether | 1 | 10 + | 10 NIOSH | 50 |
Allyl propyl disulfide | 0.5 | 2 | 3 NIOSH | - |
Alpha-alumina (td) | - | 15 mg/m3 | - | - |
Alpha-alumina (rf) | - | 5 mg/m3 | - | - |
Aluminum, metal (td) | - | 15 mg/m3 | - | - |
Aluminum metal (rf) | 1 mg/m3 | 5 mg/m3 | - | - |
2-aminopyridine | 0.5 | 0.5 | - | 5 |
Ammonia | 25 | 50 | 35 ACGIH / NIOSH | 300 |
Ammonium sulfamate (td) | 10 mg/m3 | 15 mg/m3 | - | 1500 mg/m3 |
Ammonium sulfamate (rf) | - | 5 mg/m3 | - | - |
n-amyl acetate (1-Pentyl acetate) | 50 | 100 | 100 ACGIH | 1000 |
sec-amyl acetate (2-Pentyl acetate) | 50 | 125 | 100 ACGIH | 1000 |
Aniline and homologs | 2 | 5 | - | 100 ++ |
Anisidine o-, p-isomers | 0.1 | 0.5 mg/m3 | - | 50 mg/m3 ++ |
Antimony & compounds | 0.5 mg/m3 | 0.5 mg/m3 | - | 50 mg/m3 |
ANTU | 0.3 mg/m3 | 0.3 mg/m3 | - | 100 mg/m3 |
Arsenic, org. comp. | 0.01 mg/m3 | 0.5 mg/m3 | - | - |
Arsine | 0.005 | 0.05 | 0.002 mg/m3 NIOSH | 3 ++ |
Azinphos-methyl | 0.2 mg/m3 | 0.2 mg/m3 | - | 10 mg/m3 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Barium, sol. comp. | 0.5 mg/m3 | 0.5 mg/m3 | - | 50 mg/m3 |
Barium sulfate (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Barium sulfate (rf) | - | 5 mg/m3 | - | - |
Benomyl (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Benomyl (rf) | - | 5 mg/m3 | - | - |
Benzene *See 29 CFR 1910.1028 | 0.5 | 1* | 5* OSHA 2.5 ACGIH 1 NIOSH |
500 ++ |
Benzoyl peroxide | 5 mg/m3 | 5 mg/m3 | - | 1500 mg/m3 |
Benzyl chloride | 1 | 1 | 1 / 15min NIOSH | 10 |
Beryllium | 0.002 mg/m3 | 0.002 mg/m3 | 0.005 ; 0.025 30 min. peak/8 hr. shift OSHA 0.0005 mg/m3 NIOSH |
4 mg/m3 ++ |
Bismuth telluride undoped (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Bismuth telluride undoped (rf) | - | 5 mg/m3 | - | - |
Boron oxide (td) | 10 mg/m3 | 15 mg/m3 | - | 2000 mg/m3 |
Boron trifluoride | - | - | 1.0 NIOSH, OSHA, ACGIH | 25 |
Bromine | 0.1 | 0.1 | 0.2 ACGIH 0.3 NIOSH |
3 |
Bromoform | 0.5 | 0.5 | - | 850 |
1,3 butadiene | 2 | 1 | 5 OSHA | 2000 ++ (LEL) |
2-butanone (MEK) | 200 | 200 | 300 ACGIH / NIOSH | 3000 |
2-butoxyethanol | 20 | 50 | - | 700 |
n-butyl-acetate | 150 | 150 | 200 ACGIH / NIOSH | 1700 (LEL) |
sec-butyl acetate | 200 | 200 | - | 1700 (LEL) |
tert-butyl acetate | 200 | 200 | - | 1500 (LEL) |
n-Butyl alcohol (n-butanol) | 20 | 100 | 50 NIOSH | 1400 (LEL) |
sec-Butyl alcohol (sec-butanol) | 100 | 150 | 150 NIOSH | 2000 |
tert-Butyl alcohol (tert-butanol) | 100 | 100 | 150 NIOSH | 1600 |
Butylamine | 5 + | 5 + | 5 NIOSH | 300 |
tert-butyl chromate See 29 CFR 1910.1026 | - | - | 0.1 mg/m3 ACGIH, OSHA | 15 mg/m3 ++ |
n-butyl glycidyl ether | 3 | 50 | 5.6 /15 min. NIOSH | 250 |
Butyl mercaptan | 0.5 | 10 | 0.5 /15 min. NIOSH | 500 |
p-tert-butyl-1-toluene | 1 | 10 | 20 NIOSH | 100 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Cadmium fume See 29 CFR 1910.1027 | - | 0.3 mg/m3 | - | 9 mg/m3 ++ |
Cadmium dust See 29 CFR 1910.1027 | - | 0.3 mg/m3 | - | 9 mg/m3 ++ |
Calcium carbonate (td) (limestone) | - | 15 mg/m3 | - | - |
Calcium carbonate (rf) | - | 5 mg/m3 | - | - |
Calcium hydroxide (td) | 5 mg/m3 | 15 mg/m3 | - | - |
Calcium hydroxide (rf) | - | 5 mg/m3 | - | - |
Calcium oxide | 2 mg/m3 | 5 mg/m3 | - | 25 mg/m3 |
Calcium silicate (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Calcium silicate (rf) | - | 5 mg/m3 | - | - |
Calcium sulfate (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Calcium sulfate (rf) | - | 5 mg/m3 | - | - |
Camphor, synthetic | 12 mg/m3 | 2 mg/m3 | 19 mg/m3 ACGIH | 200 mg/m3 |
Carbaryl | 5 mg/m3 | 5 mg/m3 | - | 100 mg/m3 |
Carbon black | 3.5 mg/m3 | 3.5 mg/m3 | - | 1750 mg/m3 ++ |
Carbon dioxide | 5000 | 5000 | 30,000 ACGIH / NIOSH | 40,000 |
Carbon disulfide | 1 | 20 | 10 NIOSH | 500 |
Carbon monoxide | 25 | 50 | 200 NIOSH | 1200 |
Carbon tetrachloride | 5 | 10 | 10 ACGIH 2 / 60 min. NIOSH |
200 ++ |
Cellulose (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Cellulose (rf) | - | 5 mg/m3 | - | - |
Chlorodane | 0.5 mg/m3 | 0.5 mg/m3 | - | 100 mg/m3++ |
Chlorinated camphene | 0.5 mg/m3 | 0.5 mg/m3 | - | 200 mg/m3++ |
Chlorinated diphenyl oxide | 0.5 mg/m3 | 0.5 mg/m3 | - | 5 mg/m3 |
Chlorine | 0.5 | - | 1 ACGIH/OSHA 0.5 NIOSH |
10 |
Chlorine dioxide | 0.1 | 0.1 | 0.3 ACGIH / NIOSH | 5 |
Chlorine trifluoride | 0.1 + | 0.1 + | 0.1 NIOSH | 20 |
Chloroacetaldehyde | 1 + | 1 + | 1 NIOSH | 45 |
a-chloroacetophenone | 0.05 | 0.05 | - | 15 mg/m3 |
Chlorobenzene | 10 | 75 | - | 1000 |
o-chlorobenzylidene malononitrile | 0.05+ | 0.05 | 0.05 NIOSH | 2 mg/m3 |
Chlorobromomethane | 200 | 200 | - | 2000 |
Chlorodiphenyl (42% Cl) | 1 mg/m3 | 1 mg/m3 | - | 5 mg/m3++ |
Chlorobiphenyl (54% Cl) | 0.5 mg/m3 | 0.5 mg/m3 | - | 5 mg/m3++ |
Chloroform | 10 | 50+ | 2 /60 min. NIOSH | 500 ++ |
1-chloro-1-nitro- propane | 2 | 20 | - | 100 |
Chloropicrin | 0.1 | 0.1 | - | 2 |
beta-chloroprene | 10 | 25 | 1 / 15 min. NIOSH | 300 |
Chromic acids and chromate | 0.05 mg/m3 | 0.1 mg/m3+ | - | 15 mg/m3 ++ |
Chromium (II) compounds | - | 0.5 mg/m3 | - | 250 mg/m3 |
Chromium (III) compounds | 0.5 mg/m3 | 0.5 mg/m3 | - | 25 mg/m3 |
Chromium metal and insoluble salts | - | 1 mg/m3 | - | 250 mg/m3 |
Clopidol (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Clopidol (rf) | - | 5 mg/m3 | - | - |
Coal dust (less than 5% SiO (2) anthracite) | 0.4 mg/m3 | 2.4 mg/m3 | - | - |
Coal dust (greater or equal to 5% SiO(2) bituminous) | 0.9 mg/m3 | 10 mg/m3 | - | - |
Coal tar pitch volatiles | 0.2 mg/m3 | 0.2 mg/m3 | - | 80 mg/m3++ |
Cobalt metal, dust and fume | 0.02 mg/m3 | 0.1 mg/m3 | - | 20 mg/m3 |
Copper fume | 0.2 mg/m3 | 0.1 mg/m3 | 0.1 mg/m3 ACGIH | 100 mg/m3 |
Copper dusts and mists | 1 mg/m3 | 1 mg/m3 | - | 100 mg/m3 |
Cotton dust | 0.2 mg/m3 | 1 mg/m3 | - | 100 mg/m3 |
Crag herbicide (td) (sesone) | 10 mg/m3 | 15 mg/m3 | - | 500 mg/m3 |
Crag herbicide (rf) | - | 5 mg/m3 | - | - |
Cresol, all isomers | 5 | 5 | - | 250 |
Crotonaldehyde | 0.3 + | 2 | - | 50 |
Cumene | 50 | 50 | - | 900 (LEL) |
Cyanides | - | 5 mg/m3 | - | 25 mg/m3 |
Cyclohexane | 100 | 300 | - | 1300 (LEL) |
Cyclohexanol | 50 | 50 | - | 400 |
Cyclohexanone | 20 | 50 | - | 700 |
Cyclohexene | 300 | 300 | - | 2000 |
Cyclopentadiene | 75 | 75 | - | 750 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
2,4-D (Dichlorophenoxyacetic acid) | 10 mg/m3 | 10 mg/m3 | - | 100 mg/m3 |
Decaborane | 0.05 | 0.05 | 0.15 ACGIH / NIOSH | 15 mg/m3 |
Demeton | 0.05 mg/m3 | 0.1 mg/m3 | - | 10 mg/m3 |
Diacetone alcohol | 50 | 50 | - | 1800 (LEL) |
Diazomethane | 0.2 | 0.2 | - | 2 |
Diborane | 0.1 | 0.1 | - | 15 |
Dibutyl phosphate | 1 | 1 | 2 ACGIH / NIOSH | 30 |
Dibutyl phthalate | 5 mg/m3 | 5 mg/m3 | - | 4000 mg/m3 |
o-dichlorobenzene | 25 | 50+ | 50 ACGIH / NIOSH | 200 |
p-dichlorobenzene | 10 | 75 | - | 150 ++ |
Dichlorodifluoromethane | 1000 | 1000 | - | 15,000 |
1,3 dichloro 5,5 dimethyl hydantoin | 0.2 mg/m3 | 0.2 mg/m3 | - | 5 mg/m3 |
Dichlorodiphenyltri-chloroethane (DDT) | 1 mg/m3 | 1 mg/m3 | - | 500 mg/m3 ++ |
1,1 dichloroethane | 100 | 100 | - | 3000 |
1,2-dichloroethylene | 200 | 200 | - | 1000 |
Dichloroethyl ether | 5 | 15 + | 10 ACGIH / NIOSH | 100 ++ |
Dichloromono- fluomethane (dichlorofluoromethane) | 10 | 1000 | - | 5000 |
1,1 Dichloro-1- nitroethane | 2 | 10 + | - | 25 |
Dichlorotetra- fluoroethane | 1000 | 1000 | - | 15,000 |
Dichlorvos (DDVP) | 0.1 mg/m3 | 1 mg/m3 | - | 100 mg/m3 |
Dicyclopentadienyl iron (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Dicyclopentadienyl iron (rf) | - | 5 mg/m3 | - | - |
Dieldrin | 0.25 mg/m3 | 0.25 mg/m3 | - | 50 mg/m3++ |
Diethylamine | 5 | 25 | 15 ACGIH 12 NIOSH |
200 |
2-diethylaminoethanol | 2 | 10 | - | 100 |
Difluorodibromomethane | 100 | 100 | - | 2000 |
Diglycidyl ether (DGE) | 0.01 | 0.5 + | - | 10 ++ |
Diisobutyl ketone | 25 | 50 | - | 500 |
Diisopropylamine | 5 | 5 | - | 200 |
Dimethyl acetamide | 10 | 10 | - | 300 |
Dimethylamine | 5 | 10 | 15 ACGIH | 500 |
Dimethylaniline (N,N-dimethylaniline) | 5 | 5 | 10 ACGIH / NIOSH | 100 |
Dimethyl-1,2-dibromo- 2,2-dichloroethyl phosphate (NALED) | 0.1 mg/m3 | 3 mg/m3 | - | 200 mg/m3 |
Dimethylformamide | 10 | 10 | - | 500 |
1,1-dimethylhydrazine | 0.01 | 0.5 | 0.06/120 min. NIOSH | 15++ |
Dimethylphthalate | 5 mg/m3 | 5 mg/m3 | - | 2000 mg/m3 |
Dimethyl sulfate | 0.1 | 1 | - | 7++ |
Dinitrobenzene (all isomers) | 0.15 | 1 mg/m3 | - | 50 mg/m3 |
Dinitro-o-cresol | 0.2 mg/m3 | 0.2 mg/m3 | - | 5 mg/m3 |
Dinitrotoluene | 0.2 mg/m3 | 1.5 mg/m3 | - | 50 mg/m3++ |
Dioxane (diethylene dioxide) | 20 | 100 | 1/30 min. NIOSH | 500 ++ |
Diphenyl (biphenyl) | 0.2 | 0.2 | - | 100 mg/m3 |
Dipropylene glycol methyl ether DPGME [2-(methoxymethylethoxy) propanol] |
100 | 100 | 150 ACGIH / NIOSH | 600 |
Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate) DEHP | 5 mg/m3 | 5 mg/m3 | - | 5000 mg/m3 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Emery (td) | - | 15 mg/m3 | - | - |
Emery (rf) | - | 5 mg/m3 | - | - |
Endosulfan | 0.1 mg/m3 | - | - | - |
Endrin | 0.1 mg/m3 | 0.1 mg/m3 | - | 2 mg/m3 |
Epichlorohydrin | 0.5 | 5 | - | 75++ |
EPN | 0.1 mg/m3 | 0.5 mg/m3 | - | 5 mg/m3 |
Ethanolamine | 3 | 3 | 6 ACGIH / NIOSH | 30 |
2-ethoxyethanol (cellosolve) | 5 | 200 | - | 500 |
2-ethoxyethyl acetate (cellosolve acetate) | 5 | 100 | - | 500 |
Ethyl acetate | 400 | 400 | - | 2000 (LEL) |
Ethyl acrylate | 5 | 25 | 15 ACGIH | 300 ++ |
Ethyl alcohol (ethanol) | 1000 | 1000 | - | 3300 (LEL) |
Ethylamine | 5 | 10 | 15 ACGIH | 600 |
Ethyl amyl ketone (5- methyl-3-heptanone) | 10 | 25 | - | - |
Ethyl benzene | 100 | 100 | 125 ACGIH / NIOSH | 800 (LEL) |
Ethyl bromide | 5 | 200 | - | 2000 |
Ethyl butyl ketone (3- heptanone) | 50 | 50 | 75 ACGIH | 1000 |
Ethyl chloride | 100 | 1000 | - | 3800 (LEL) |
Ethyl ether | 400 | 400 | 500 ACGIH | 1900 |
Ethyl formate | 100 | 100 | - | 1500 |
Ethyl mercaptan | 0.5 | 10 + | 0.5/15 min. NIOSH | 500 |
Ethyl silicate | 10 | 100 | - | 700 |
Ethylene chlorohydrin | 1 + | 5 | 1 NIOSH | 7 |
Ethylenediamine | 10 | 10 | - | 1000 |
Ethylene dibromide | - | 20 | 30; 50/5 min. peak 8 hr. OSHA 0.13/15 min. NIOSH |
100 ++ |
Ethylene dichloride | 10 | 50 | 2 NIOSH | 50 ++ |
Ethylene glycol dinitrate | 0.05 | 0.2 + | - | 75 mg/m3 |
N-ethylmorpholine | 5 | 20 | - | 100 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Ferbam (td) | 10 mg/m3 | 15 mg/m3 | - | 800 mg/m3 |
Ferrovanadium dust | 1 mg/m3 | 1 mg/m3 | 3 mg/m3 ACGIH / NIOSH | 500 mg/m3 |
Fluorides (as f) | 2.5 mg/m3 | 2.5 mg/m3 | - | 250 mg/m3 |
Fluorine | 1 | 0.1 | 2 ACGIH | 25 |
Fluorotrichloromethane (trichlorofluoromethane) | 1000 + | 1000 | 1000 NIOSH | 2000 |
Formaldehyde See 29 CFR 1910.1048 | 0.3 + | 0.75 | 0.1/15 min. NIOSH | 20 ++ |
Formic acid | 5 | 5 | 10 ACGIH | 30 |
Furfural | 2 | 5 | - | 100 |
Furfuryl alcohol | 10 | 50 | 15 ACGIH / NIOSH | 75 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Glycerin (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Glycerin (rf) | - | 5 mg/m3 | - | - |
Glycidol | 2 | 50 | - | 150 |
Grain dust (oat, wheat, barley) | 4 mg/m3 | 10 mg/m3 | - | - |
Graphite, natural | 2 mg/m3 | 15 mg/m3 | - | 1250 mg/m3 |
Graphite, synthetic (td) | 2 mg/m3 | 15 mg/m3 | - | - |
Graphite, synthetic (rf) | - | 5 mg/m3 | - | - |
Gypsum (td) | - | 15 mg/m3 | - | - |
Gypsum (rf) | - | 5 mg/m3 | - | - |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Hafnium | 0.5 mg/m3 | 0.5 mg/m3 | - | 50 mg/m3 |
Heptachlor | 0.05 mg/m3 | 0.5 mg/m3 | - | 35 mg/m3 ++ |
Heptane (n-heptane) | 400 | 500 | 500 ACGIH 440 / 15 min. NIOSH |
750 |
Hexachloroethane | 1 | 1 | - | 300++ |
Hexachloronaph- thalene | 0.2 mg/m3 | 0.2 mg/m3 | - | 2 mg/m3 |
n-hexane | 50 | 500 | - | 1100 (LEL) |
2-hexanone (methyl n-butyl ketone) | 5 | 100 | 10 ACGIH | 1600 |
Hexone (methyl isobutyl ketone) | 50 | 100 | 75 ACGIH / NIOSH | 500 |
sec-hexyl acetate | 50 | 50 | - | 500 |
Hydrazine | 0.01 | 1 | 0.03 / 120 min. NIOSH | 50 ++ |
Hydrogen bromide | 2 + | 3 | 3 NIOSH | 30 |
Hydrogen chloride | 2 + | 5 + | 5 NIOSH | 50 |
Hydrogen cyanide | 4.7+ | 10 | 4.7 NIOSH | 50 |
Hydrogen fluoride | 0.5 | 3 | 2 ACGIH 6 / 15 min. NIOSH |
30 |
Hydrogen peroxide | 1 | 1 | - | 75 |
Hydrogen selenide (as Se) | 0.05 | 0.05 | - | 1 |
Hydrogen sulfide | 10 | 20+ | 15 ACGIH 10 NIOSH |
100 |
Hydroquinone | 1 mg/m3 | 2 mg/m3 | 2 mg/m3 / 15 min. NIOSH | 50 mg/m3 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Iodine | 0.1 + | 0.1 + | 0.1 NIOSH | 2 |
Iron oxide fume | 5 mg/m3 | 10 mg/m3 | - | 2500 mg/m3 |
Isoamyl acetate (isopentyl acetate) | 50 | 100 | 100 ACGIH | 1000 |
Isoamyl alcohol (primary and secondary) | 100 | 100 | 125 ACGIH / NIOSH | 500 |
Isobutyl acetate | 150 | 150 | - | 1300 (LEL) |
Isobutyl alcohol | 50 | 100 | - | 1600 |
Isophorone | 5 + | 25 | - | 200 |
Isopropyl acetate | 100 | 250 | 200 ACGIH | 1800 |
Isopropyl alcohol (2-propanol) | 200 | 400 | 400 ACGIH 500 NIOSH |
2000 (LEL) |
Isopropylamine | 5 | 5 | 10 ACGIH | 750 |
Isopropyl ether | 250 | 500 | 310 ACGIH | 1400 (LEL) |
Isopropyl glycidyl ether (IGE) | 50 | 50 | 75 ACGIH 50 / 15 min. NIOSH |
400 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Kaolin (td) | 2 mg/m3 | 15 mg/m3 | - | - |
Kaolin (rf) | - | 5 mg/m3 | - | - |
Ketene | 0.5 | 0.5 | 1.5 ACGIH / NIOSH | 5 |
Limestone (td) | - | 15 mg/m3 | - | - |
Limestone (rf) | - | 5 mg/m3 | - | - |
Lindane | 0.5 mg/m3 | 0.5 mg/m3 | - | 50 mg/m3 |
Lithium hydride | 0.025 mg/m3 | 0.025 mg/m3 | - | 0.5 mg/m3 |
L.P.G. (liquefied petroleum gas) | 1000 | 1000 | - | 2000 (LEL) |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Magnesite (td) | - | 15 mg/m3 | - | - |
Magnesite (rf) | - | 5 mg/m3 | - | - |
Magnesium oxide fume (total particulate) | 10 mg/m3 | 15 mg/m3 | - | 750 mg/m3 |
Malathion (td) | 1 mg/m3 | 15 mg/m3 | - | 250 mg/m3 |
Maleic anhydride | 0.1 | 0.25 | - | 10 mg/m3 |
Manganese compounds (as Mn) | 0.2 mg/m3 | 5 mg/m3+ | 3 mg/m3 NIOSH | 500 mg/m3 |
Manganese fume (as Mn) | 0.2 mg/m3 | 5 mg/m3+ | 3 mg/m3 NIOSH | 500 mg/m3 |
Marble (td) | - | 15 mg/m3 | - | - |
Marble (rf) | - | 5 mg/m3 | - | - |
Mercury (aryl and inorganic) | 0.025 mg/m3 | 0.1 mg/m3+ | 0.1 mg/m3 OSHA/ NIOSH | 10 mg/m3 |
Mercury (organo) alkyl compounds | 0.1 mg/m3 | 0.1 mg/m3+ | 0.1 mg/m3 OSHA/ NIOSH | 2 mg/m3 |
Mercury (vapor) | 0.025 mg/m3 | 0.1 mg/m3+ | 0.1 mg/m3 OSHA/ NIOSH | - |
Mesityl oxide | 15 | 25 | 25 | 1400 (LEL) |
Methoxychlor (td) | 10 mg/m3 | 15 mg/m3 | - | 5000 mg/m3++ |
2-methoxyethanol (methyl cellosolve) | 0.1 | 25 | - | 200 |
2-methoxyethyl acetate (methyl cellosolve acetate) | 0.1 | 25 | - | 200 |
Methyl acetate | 200 | 200 | 250 ACGIH / NIOSH | 3100 (LEL) |
Methyl acetylene (propyne) | 1000 | 1000 | - | 1700 (LEL) |
Methyl acetylene- propadiene mixture (MAPP) | 1000 | 1000 | 1250 ACGIH / NIOSH | 3400 (LEL) |
Methyl acrylate | 2 | 10 | - | 250 |
Methylal (dimetoxy- methane) | 1000 | 1000 | - | 2200 (LEL) |
Methyl alcohol | 200 | 200 | 250 ACGIH / NIOSH | 6000 |
Methylamine | 5 | 10 | 15 ACGIH | 100 |
Methyl n-amyl ketone | 50 | 100 | - | 800 |
Methyl bromide | 1 | 20 + | - | 250++ |
Methyl chloride | 50 | 100 | 100 ACGIH | 2000 ++ |
Methyl chloroform (1,1,1- trichloroethane) | 350 | 350 | 450 ACGIH 350 NIOSH |
700 |
Methylcyclohexane | 400 | 500 | - | 1200 (LEL) |
Methylcyclohexanol | 50 | 100 | - | 500 |
o-methylcyclohexanone | 50 | 100 | 75 ACGIH / NIOSH | 600 |
Methylene chloride (dichloromethane) See 29 CFR 1910.1003 | 50 | 25 | - | 2300 |
Methylene bisphenyl isocyanate (MDI) | 0.005 | 0.02+ | 0.02 NIOSH | 75 mg/m3 |
Methyl formate | 100 | 100 | 150 ACGIH / NIOSH | 4500 |
Methyl hydrazine (Mono- methyl hydrazine) | 0.01 | 0.2+ | 0.4 NIOSH | 20++ |
Methyl iodide | 2 | 5 | - | 100++ |
Methyl isoamyl ketone | 50 | 100 | - | - |
Methyl isobutyl carbinol | 25 | 25 | 40 ACGIH / NIOSH | 400 |
Methyl isocyanate | 0.02 | 0.02 | - | 3 |
Methyl mercaptan | 0.5 | 10 + | 0.5 / 15 min. NIOSH | 150 |
Methyl methacrylate | 50 | 100 | 100 ACGIH | 1000 |
alpha-methyl styrene | 50 | 100 + | 100 ACGIH / NIOSH | 700 |
Molybdenum (as Mo) soluble compounds | 0.5 mg/m3 | 5 mg/m3 | - | 1000 mg/m3 |
Molybdenum (as Mo) insoluble compounds (td) | 10 mg/m3 I 3 mg/m3 R |
15 mg/m3 | - | 5000 mg/m3 |
Monomethyl aniline (N-methyl aniline) | 0.5 | 2 | - | 100 |
Morpholine | 20 | 20 | 30 NIOSH | 1400 (LEL) |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Naphtha (coal tar) | 400 | 100 | - | 1000 (LEL) |
Naphthalene | 10 | 10 | 15 ACGIH / NIOSH | 250 |
Nickel carbonyl (as Ni) | 0.05 | 0.001 | - | 2++ |
Nickel, metal and insoluble compounds (as Ni) | 0.2 mg/m3 | 1 mg/m3 | - | 10 mg/m3++ |
Nickel, soluble compounds (as Ni) | 0.1 mg/m3 | 1 mg/m3 | - | ++ |
Nicotine | 0.5 mg/m3 | 0.5 mg/m3 | - | 5 mg/m3 |
Nitric acid | 2 | 2 | 4 ACGIH / NIOSH | 25 |
Nitric oxide | 25 | 25 | - | 100 |
p-nitroaniline | 3 mg/m3 | 1 | - | 300 mg/m3 |
Nitrobenzene | 1 | 1 | - | 200 |
p-nitrochlorobenzene | 0.1 | 1 mg/m3 | - | 100 mg/m3 ++ |
Nitroethane | 100 | 100 | - | 1000 |
Nitrogen dioxide | 3 | 5+ | 5 ACGIH 1 NIOSH |
20 |
Nitrogen trifluoride | 10 | 10 | - | 1000 |
Nitroglycerin | 0.05 | 0.2+ | 0.1 mg/m3 NIOSH | 75 mg/m3 |
Nitromethane | 20 | 100 | - | 750 |
1-nitropropane | 25 | 25 | - | 1000 |
2-nitropropane | 10 | 25 | - | 100 ++ |
Nitrotoluene (all isomers) | 2 | 5 | - | 200 |
Octachloronaphthalene | 0.1 mg/m3 | 0.1 mg/m3 | 0.3 mg/m3+ | Unknown |
Octane | 300 | 500 | 385 / 15 min. NIOSH | 1000 |
Oil mist, mineral | 5 mg/m3 | 5 mg/m3 | 10 mg/m3 ACGIH/ NIOSH | 2500 mg/m3 |
Osmium tetroxide (as Os) | 0.0002 | 0.002 mg/m3 | 0.0006 ACGIH / NIOSH | 1 mg/m3 |
Oxalic acid | 1 mg/m3 | 1 mg/m3 | 2 mg/m3 | 500 mg/m3 |
Oxygen difluoride | 0.05+ | 0.05 | 0.05 ACGIH / NIOSH | 0.5 |
Ozone | 0.1 light work | 0.1 | 0.1 NIOSH | 5 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Paraquat (rd) | 0.5 mg/m3 | 0.5 mg/m3 | - | 1 mg/m3 |
Parathion | 0.05 mg/m3 | 0.1 mg/m3 | - | 10 mg/m3 |
Pentaborane | 0.005 | 0.005 | 0.015 ACGIH / NIOSH | 1 |
Pentachloronaphthalene | 0.5 mg/m3 | 0.5 mg/m3 | - | Unknown |
Pentachlorophenol | 0.5 mg/m3 | 0.5 mg/m3 | - | 2.5 mg/m3 |
Pentaerythritol (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Pentaerythritol (rf) | - | 5 mg/m3 | - | - |
Pentane | 600 | 1000 | 610 / 15 min. NIOSH | 1500 (LEL) |
2-pentanone (methyl propyl ketone) | 150+ | 200 | 250 | 1500 |
Perchloroethylene (tetrachloroethylene) | 10 | 2 mg/m3 | 25 ACGIH | 150 ++ |
Perchloromethyl mercaptan | 0.1 | 0.1 | - | 10 |
Perchloryl fluoride | 3 | 3 | 6 ACGIH / NIOSH | 100 |
Perlite (td) | - | 15 mg/m3 | - | - |
Perlite (rf) | - | 5 mg/m3 | - | - |
Petroleum distillates (naphtha) (rubber solvent) | See Specific | 500 | 1800 mg/m3 NIOSH | 1100 (LEL) |
Phenol | 5 | 5 | 15.6 /15 min. NIOSH | 250 |
p-phenylene diamine | 0.1 mg/m3 | 0.1 mg/m3 | - | 25 mg/m3 |
Phenyl ether, vapor | 1 | 1 | 2 ACGIH | 100 |
Phenyl ether-biphenyl mixture, vapor | - | 1 | - | 10 |
Phenyl glycidyl ether (PGE) | 0.1 | 10 | 1 /15 min. NIOSH | 100++ |
Phenylhydrazine | 0.1 | 5 | 0.14 /120 min. NIOSH | 15++ |
Phosdrin (mevinphos) | 0.01 mg/m3 | 0.1 mg/m3 | 0.03 NIOSH | 4 |
Phosgene (carbonyl chloride) | 0.1 | 0.1 | 0.2 / 15 min. NIOSH | 2 |
Phosphine | 0.3 | 0.3 | 1 ACGIH / NIOSH | 50 |
Phosphoric acid | 1 mg/m3 | 1 mg/m3 | 3 mg/m3 ACGIH / NIOSH | 1000 mg/m3 |
Phosphorus (yellow) | 0.02 | 0.1 mg/m3 | - | 5 mg/m3 |
Phosphorus pentachloride | 0.1 | 1 mg/m3 | - | 70 mg/m3 |
Phosphorus pentasulfide | 1 mg/m3 | 1 mg/m3 | 3 mg/m3 | 250 mg/m3 |
Phosphorus trichloride | 0.2 | 0.5 | 0.5 | 25 |
Phthalic anhydride | 1 | 2 | - | 60 mg/m3 |
Picloram (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Picloram (rf) | - | 5 mg/m3 | - | - |
Picric acid | 0.1 mg/m3 | 0.1 mg/m3 | - | 75 mg/m3 |
Pindone (2-pivalyl-1, 3-indandione) | 0.1 mg/m3 | 0.1 mg/m3 | - | 100 mg/m3 |
Plaster of paris (td) | - | 15 mg/m3 | - | - |
Plaster of paris (rf) | - | 5 mg/m3 | - | - |
Platinum (as Pt) soluble salts | 0.002 mg/m3 | 0.002 mg/m3 | - | 4 mg/m3 |
Portland cement (td) | 10 mg/m3 | 15 mg/m3 | - | 5000 mg/m3 |
Portland cement (rf) | - | 5 mg/m3 | - | - |
Propane (aliphatic hydrocarbon gases) | 1000 | 1000 | - | 2100 (LEL) |
n-propyl acetate | 200 | 200 | 250 ACGIH / NIOSH | 1700 |
n-propyl alcohol (n-propanol) | 100 | 200 | 250 NIOSH | 800 |
Propylene dichloride | 10 | 75 | - | 400++ |
Propylene imine | 2 | 2 | - | 100++ |
Propylene oxide | 2 | 100 | - | 400++ |
n-propyl nitrate | 25 | 25 | 40 ACGIH / NIOSH | 500 |
Pyrethrum | 5 mg/m3 | 5 mg/m3 | - | 5000 mg/m3 |
Pyridine | 1 | 5 | - | 1000 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Quinone | 0.1 | 0.1 | - | 100 mg/m3 |
Rhodium, metal fume and insoluble compounds | 1 mg/m3 | 0.1 mg/m3 | - | 100 mg/m3 |
Rhodium, soluble compounds | 0.01 mg/m3 | 0.001 mg/m3 | - | 2 mg/m3 |
Ronnel | 5 mg/m3 | 15 mg/m3 | - | 300 mg/m3 |
Rotenone | 5 mg/m3 | 5 mg/m3 | - | 2500 mg/m3 |
Rouge (td) | - | 15 mg/m3 | - | - |
Rouge (rf) | - | 5 mg/m3 | - | - |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Selenium compounds (as Se) | 0.2 mg/m3 | 0.2 mg/m3 | - | 1 mg/m3 |
Selenium hexafluoride (as Se) | 0.05 | 0.05 | - | 2 |
Soapstone (td) | 6 mg/m3 | 20 mppcf | - | 3000 mg/m3 |
Soapstone (rf) | 3 mg/m3 | 20 mppcf | - | 3000 mg/m3 |
Silicon (td) | - | 15 mg/m3 | - | - |
Silicon (rf) | 3 mg/m3 | 5 mg/m3 | - | - |
Silicon carbide (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Silicon carbide (rf) | - | 5 mg/m3 | - | - |
Silver, metal and soluble compounds (as Ag) | 0.1 mg/m3 | 0.01 mg/m3 | - | 10 mg/m3 |
Sodium fluoro- acetate | 0.05 mg/m3 | 0.05 mg/m3 | - | 2.5 mg/m3 |
Sodium hydroxide | 2 mg/m3+ | 2 mg/m3 | 2 mg/m3 NIOSH | 10 mg/m3 |
Starch (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Starch (rf) | - | 5 mg/m3 | - | - |
Stibine (antimony hydride) | 0.1 | 0.1 | - | 5 |
Stoddard solvent | 100 | 500 | 1800 mg/m3 /15min NIOSH |
20,000 mg/m3 |
Strychnine | 0.15 mg/m3 | 0.15 mg/m3 | - | 3 mg/m3 |
Styrene | 20 | 100 | 40 ACGIH 100 NIOSH |
700 |
Sucrose (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Sucrose (rf) | - | 5 mg/m3 | - | - |
Sulfur dioxide | 2 | 5 | 5 ACGIH / NIOSH | 100 |
Sulfur hexafluoride | 1000 | 1000 | - | - |
Sulfuric acid | 0.2 mg/m3 | 1 mg/m3 | - | 15 mg/m3 |
Sulfur monochloride | 1+ | 1 | 1 NIOSH | 5 |
Sulfur pentafluoride | 0.01+ | 0.025 | 0.01 NIOSH | 1 |
Sulfuryl fluoride | 5 | 5 | 10 ACGIH / NIOSH | 200 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
2,4,5-T (2,4,5-trichloro- phenoxyacetic acid) | 10 mg/m3 | 10 mg/m3 | - | 250 mg/m3 |
Talc (containing asbestos) See 29 CFR 1910.1001 | - | - | - | 1000 mg/m3 ++ |
Talc (containing no asbestos) | 2 mg/m3 | 20 mppcf | - | 1000 mg/m3 |
Tantalum, metal and oxide dust | 5 mg/m3 | 5 mg/m3 | - | 2500 mg/m3 |
TEDP (sulfotep) | 0.1 mg/m3 | 0.2 mg/m3 | - | 10 mg/m3 |
Tellurium and compounds (as Te) | 0.1 mg/m3 | 0.1 mg/m3 | - | 25 mg/m3 |
Tellurium hexafluoride (as Te) | 0.02 | 0.02 | - | 1 |
Temephos (td) | 1 mg/m3 | 15 mg/m3 | - | - |
Temephos (rf) | - | 5 mg/m3 | - | - |
TEPP (tetraethyl pyrophosphate) | 0.01 mg/m3 | 0.05 mg/m3 | - | 5 mg/m3 |
Terphenyls | 0.53 + | 1 + | 0.5 NIOSH | 500 mg/m3 |
1,1,1,2-tetrachloro-2, 2-difluoroethane | 100 | 500 | - | 2000 |
1,1,2,2-tetrachloro-1, 2-difluoroethane | 50 | 500 | - | 2000 |
1,1,2,2-tetrachloroethane | 1 | 5 | - | 100++ |
Tetrachloronaphthalene | 2 mg/m3 | 2 mg/m3 | - | Unknown |
Tetraethyl lead (as Pb) | 0.1 mg/m3 | 0.075 mg/m3 | - | 40 mg/m3 |
Tetrahydrofuran | 50 | 200 | 100 ACGIH 250 NIOSH |
2000 (LEL) |
Tetramethyl lead (as Pb) | 0.15 mg/m3 | 0.075 mg/m3 | - | 40 mg/m3 |
Tetramethyl succinonitrile | 0.5 | 0.5 | - | 5 |
Tetranitromethane | 0.005 | 1 | - | 4 |
Tetryl (2,4,6-trinitro-phenylmethylnitramine) | 1.5 mg/m3 | 1.5 mg/m3 | - | 750 mg/m3 |
Thallium, soluble compounds (as Tl) | 0.1 mg/m3 | 0.1 mg/m3 | - | 15 mg/m3 |
4,4'-Thiobis (6-tert, butyl-m-cresol) (td) | 10 mg/m3 | 15 mg/m3 | - | - |
4,4'-Thiobis (6-tert, butyl-m-cresol) (rf) | - | 5 mg/m3 | - | - |
Thiram | 0.05 mg/m3 | 5 mg/m3 | - | 100 mg/m3 |
Tin, inorganic compounds (except oxides) (as Sn) | 2 mg/m3 | 2 mg/m3 | - | 100 mg/m3 |
Tin, organic compounds (as Sn) | 0.1 mg/m3 | 0.1 mg/m3 | - | 25 mg/m3 |
Titanium dioxide (td) | 10 mg/m3 | 15 mg/m3 | - | 5000 mg/m3 ++ |
Toluene | 20 | 200 | 300 OSHA 500 /10 min. peak 150 NIOSH |
500 |
Toluene-2,4-diisocyanate (TDI) | 0.005 | 0.02+ | - | 2.5++ |
o-toluidine | 2 | 5 | - | 50++ |
Tributyl phosphate | 0.2 | 5 mg/m3 | - | 30 |
1,1,2-trichloroethane | 10 | 10 | - | 100++ |
Trichloroethylene | 10 | 100 | 25 ACGIH | 1000 ++ |
Trichloronaphthalene | 5 mg/m3 | 5 mg/m3 | - | Unknown |
1,2,3-trichloropropane | 10 | 50 | - | 100++ |
1,1,2-trichloro-1,2,2- trifluoroethane | 1000 | 1000 | 1250 ACGIH / NIOSH | 2000 |
Triethylamine | 1 | 25 | 3 ACGIH | 200 |
Trifluorobromo- methane | 1000 | 1000 | - | 40,000 |
2,4,6-trinitrotoluene (TNT) | 0.1 mg/m3 | 1.5 mg/m3 | - | 500 mg/m3 |
Triorthocresyl phosphate | 0.1 mg/m3 | 0.1 mg/m3 | - | 40 mg/m3 |
Triphenyl phosphate | 3 mg/m3 | 3 mg/m3 | - | 1000 mg/m3 |
Turpentine | - | 100 | - | 800 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Uranium (as U) soluble compounds | 0.2 mg/m3 | 0.05 mg/m3 | - | 10 mg/m3++ |
Uranium (as U) insoluble compounds | 0.2 mg/m3 | 0.25 mg/m3 | - | 10 mg/m3++ |
Vegetable oil mist (td) | - | 15 mg/m3 | - | - |
Vegetable oil mist (rf) | - | 5 mg/m3 | - | - |
Vinyl toluene | 50 | 100 | 100 ACGIH | 400 |
Warfarin | 0.1 mg/m3 | 0.1 mg/m3 | - | 100 mg/m3 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Chemical Name | TLV ppm |
PEL ppm |
STEL/Ceiling ppm |
IDLH ppm |
---|---|---|---|---|
Xylenes (o-, m-, p-isomers) | 100 | 100 | 150 ACGIH / NIOSH | 900 |
Xylidine | 0.5 | 5 | - | 50 |
Yttrium | 1 mg/m3 | 1 mg/m3 | - | 500 mg/m3 |
Zinc chloride fume | 1 mg/m3 | 1 mg/m3 | 2 mg/m3 ACGIH / NIOSH | 50 mg/m3 |
Zinc oxide fume | - | 5 mg/m3 | - | 500 mg/m3 |
Zinc oxide (td) | 2 mg/m3 | 15 mg/m3 | - | 500 mg/m3 |
Zinc oxide (rf) | - | 5 mg/m3 | - | 500 mg/m3 |
Zinc stearate (td) | 10 mg/m3 | 15 mg/m3 | - | - |
Zinc stearate (rf) | - | 5 mg/m3 | - | - |
Zirconium compounds (as Zr) | 5 mg/m3 | 5 mg/m3 | 10 mg/m3 | 25 mg/m3 |
" + " indicates a ceiling value
" ++ " indicates that the chemical is believed, by NIOSH, to be a potential carcinogen.
Sources
Information on the most up to date NIOSH chemical hazards can be found online in the NIOSH Pocket Guide to Chemical Hazards, NIOSH, 2010
OSHA 29 CFR 1910.1000, Table Z-1
The information contained in this article is intended for general information purposes only and is based on information available as of the initial date of publication. No representation is made that the information or references are complete or remain current. This article is not a substitute for review of current applicable government regulations, industry standards, or other standards specific to your business and/or activities and should not be construed as legal advice or opinion. Readers with specific questions should refer to the applicable standards or consult with an attorney.
SIGN UP FOR EMAIL
Get more great content like this sent to your inbox.