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    IDLH ( Immediately Dangerous To Life or Health) Concentrations GUIDE

    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

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