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Immediately Dangerous To Life or Health (IDLH) Values										
Alert_06
		Archived: This Page Is No Longer Being Updated
			**NOTE:** This page is archived for historical purposes and is no longer being maintained or updated.										Related Pages
										Original (SCP) IDLH Values
Substance
CAS no.
Original (SCP) IDLH Values*Acetaldehyde
75-07-0
10,000 ppmAcetic acid
64-19-7
1,000 ppmAcetic anhydride
108-24-7
1,000 ppmAcetone
67-64-1
20,000 ppmAcetonitrile
75-05-8
4,000 ppmAcetylene tetrabromide
79-27-6
10 ppmAcrolein
107-02-8
5 ppmAcrylamide
79-06-1
UnknownAcrylonitrile
107-13-1
500 ppmAldrin
309-00-2
100 mg/m3Allyl alcohol
107-18-6
150 ppmAllyl chloride
107-05-1
300 ppmAllyl glycidyl ether
106-92-3
270 ppm2 Aminopyridine
504-29-0
5 ppmAmmonia
7664-41-7
500 ppmAmmonium sulfamate
7773-06-0
5,000 mg/m3n-Amyl acetate
628-63-7
4,000 ppmsec-Amyl acetate
626-38-0
9,000 ppmAniline
62-53-3
100 ppmo-Anisidine
90-04-0
50 mg/m3p-Anisidine
104-94-9
50 mg/m3Antimony compounds (as Sb)
7440-36-0
80 mg Sb/m3ANTU
86-88-4
100 mg/m3Arsenic (inorganic compounds, as As)
7440-38-2 (metal)
100 mg As/m3Arsine
7784-42-1
6 ppmAzinphosmethyl
86-50-0
20 mg/m3Barium (soluble compounds, as Ba)
7440-39-3
1,100 mg Ba/m3Benzene
71-43-2
3,000 ppmBenzonitrileBenzoyl peroxide
94-36-0
7,000 mg/m3Benzyl chloride
100-44-7
10 ppmBeryllium compounds (as Be)
7440-41-7 (metal)
10 mg Be/m3Boron oxide
1303-86-2
N.E.Boron trifluoride
7637-07-2
100 ppmBromine
7726-95-6
10 ppmBromine PentafluorideBromoform
75-25-2
UnknownButane
106-97-81,3-Butadiene
106-99-0
20,000 ppm [LEL]2-Butanone
78-93-3
3,000 ppm2-Butoxyethanol
111-76-2
700 ppmn-Butyl acetate
123-86-4
10,000 ppmsec-Butyl acetate
105-46-4
10,000 ppmtert-Butyl acetate
540-88-5
10,000 ppmn-Butyl alcohol
71-36-3
8,000 ppmsec-Butyl alcohol
78-92-2
10,000 ppmtert-Butyl alcohol
75-65-0
8,000 ppmn-Butylamine
109-73-9
2,000 ppmtert-Butyl chromate
1189-85-1
30 mg/m3 (as CrO3)n-Butyl Acrylate
141-32-2n-Butyl glycidyl ether
2426-08-6
3,500 ppmn-Butyl mercaptan
109-79-5
2,500 ppmp-tert-Butyltoluene
98-51-1
1,000 ppmCadmium dust (as Cd)
7440-43-9 (metal)
50 mg Cd/m3Cadmium fume (as Cd)
1306-19-0 (CdO)
9 mg Cd/m3Calcium arsenate (as As)
7778-44-1
100 mg As/m3Calcium oxide
1305-78-8
UnknownCamphor (synthetic)
76-22-2
200 mg/m3Carbaryl
63-25-2
600 mg/m3Carbon black
1333-86-4
N.E.Carbon dioxide
124-38-9
50,000 ppmCarbon disulfide
75-15-0
500 ppmCarbon monoxide
630-08-0
1,500 ppmCarbon tetrachloride
56-23-5
300 ppmChlordane
57-74-9
500 mg/m3Chlorinated camphene
8001-35-2
200 mg/m3Chlorinated diphenyl oxide
n/a
UnknownChlorine
7782-50-5
30 ppmChlorine dioxide
10049-04-4
10 ppmChlorine Pentafluoride
13637-63-3Chlorine trifluoride
7790-91-2
20 ppmChloroacetaldehyde
107-20-0
100 ppmalpha-Chloroacetophenone
532-27-4
100 mg/m3Chlorobenzene
108-90-7
2,400 ppmo-Chlorobenzylidene malononitrile
2698-41-1
2 mg/m3Chlorobromomethane
74-97-5
5,000 ppmChlorodiphenyl (42% chlorine)
53469-21-9
10 mg/m3Chlorodiphenyl (54% chlorine)
11097-69-1
5 mg/m3Chloroform
67-66-3
1,000 ppm1-Chloro-1-nitropropane
600-25-9
2,000 ppmChloroacetyl Chloride
79-04-9Chloropicrin
76-06-2
4 ppmbeta-Chloroprene
126-99-8
400 ppmChromic acid and chromates
1333-82-0 (CrO3)
30 mg/m3 (as CrO3)Chromium (II) compounds [as Cr(II)]
n/a
N.E.Chromium (III) compounds [as Cr(III)]
n/a
N.E.Chromium metal (as Cr)
7440-47-3
N.E.Coal tar pitch volatiles
65996-93-2
700 mg/m3Cobalt metal, dust and fume (as Co)
7440-48-4
20 mg Co/m3Copper (dusts and mists, as Cu)
7440-50-8
N.E.Copper fume (as Cu)
1317-38-0 (CuO)
N.E.Cotton dust (raw)
n/a
N.E.Crag (r) herbicide
136-78-7
5,000 mg/m3Cresol (o, m, p isomers)
95-48-7
250 ppmCrotonaldehyde
4170-30-3
400 ppmCumene
98-82-8
8,000 ppmCyanides (as CN)
n/a
50 mg/m3 (as CN)Cyclohexane
110-82-7
10,000 ppmCyclohexanol
108-93-0
3,500 ppmCyclohexanone
108-94-1
5,000 ppmCyclohexene
110-83-8
10,000 ppmCyclopentadiene
542-92-7
2,000 ppm2,4-D
94-75-7
500 mg/m3DDT
50-29-3
N.E.Decaborane
17702-41-9
100 mg/m3Demeton
8065-48-3
20 mg/m3Diacetone alcohol
123-42-2
2,100 ppmDiazomethane
334-88-3
2 ppmDiborane
19287-45-7
40 ppmDibutyl phosphate
107-66-4
125 ppmDibutyl phthalate
84-74-2
9,300 mg/m3o-Dichlorobenzene
95-50-1
1,000 ppmp-Dichlorobenzene
106-46-7
1,000 ppmDichlorodifluoromethane
75-71-8
50,000 ppm1,3-Dichloro 5,5-dimethylhydantoin
118-52-5
Unknown1,1-Dichloroethane
75-34-3
4,000 ppm1,2-Dichloroethylene
540-59-0
4,000 ppmDichloroethyl ether
111-44-4
250 ppmDichloromonofluoromethane
75-43-4
50,000 ppm1,1-Dichloro-1-Fluoroethane (HCFC-141b)
1717-00-61,1-Dichloro 1-nitroethane
594-72-9
150 ppmDichlorotetrafluoroethane
76-14-2
50,000 ppmDichlorvos
62-73-7
200 mg/m3Dieldrin
60-57-1
450 mg/m3Diethylamine
109-89-7
2,000 ppm2-Diethylaminoethanol
100-37-8
500 ppmDifluorodibromomethane
75-61-6
2,500 ppmDiglycidyl ether
2238-07-5
25 ppmDiisobutyl ketone
108-83-8
2,000 ppmDiisopropylamine
108-18-9
1,000 ppmDiketeneDimethyl acetamide
127-19-5
400 ppmDimethylamine
124-40-3
2,000 ppmN,N-Dimethylaniline
121-69-7
100 ppmDimethyl 1,2-dibromo 2,2-dichlorethyl phosphate
300-76-5
1,800 mg/m3Dimethylformamide
68-12-2
3,500 ppm1,1-Dimethylhydrazine
57-14-7
50 ppmDimethylphthalate
131-11-3
9,300 mg/m3Dimethyl sulfate
77-78-1
10 ppmDinitrobenzene (o, m, p isomers)
528-29-0
200 mg/m3Dinitroocresol
534-52-1
5 mg/m3Dinitrotoluene
25321-14-6
200 mg/m3Di sec-octyl phthalate
117-81-7
UnknownDioxane
123-91-1
2,000 ppmDiphenyl
92-52-4
300 mg/m3Dipropylene glycol methyl ether
34590-94-8
UnknownEndrin
72-20-8
2,000 mg/m3Epichlorohydrin
106-89-8
250 ppmEPN
2104-64-5
50 mg/m3Ethanolamine
141-43-5
1,000 ppm2-Ethoxyethanol
110-80-5
6,000 ppm2-Ethoxyethyl acetate
111-15-9
2,500 ppmEthyl acetate
141-78-6
10,000 ppmEthyl acrylate
140-88-5
2,000 ppmEthyl alcohol
64-17-5
15,000 ppmEthylamine
75-04-7
4,000 ppmEthyl benzene
100-41-4
2,000 ppmEthyl bromide
74-96-4
3,500 ppmEthyl butyl ketone
106-35-4
3,000 ppmEthyl chloride
75-00-3
20,000 ppmEthylene chlorohydrin
107-07-3
10 ppmEthylenediamine
107-15-3
2,000 ppmEthylene dibromide
106-93-4
400 ppmEthylene dichloride
107-06-2
1,000 ppmEthylene glycol dinitrate
628-96-6
500 mg/m3Ethyleneimine
151-56-4
100 ppmEthylene oxide
75-21-8
800 ppmEthyl ether
60-29-7
19,000 ppm [LEL]Ethyl formate
109-94-4
8,000 ppmEthyl mercaptan
75-08-1
2,500 ppmN-Ethylmorpholine
100-74-3
2,000 ppmEthyl silicate
78-10-4
1,000 ppmFerbam
14484-64-1
N.E.Ferrovanadium dust
12604-58-9
N.E.Fluorides (as F)
n/a
500 mg F/m3Fluorine
7782-41-4
25 ppmFluorotrichloromethane
75-69-4
10,000 ppmFormaldehyde
50-00-0
30 ppmFormic acid
64-18-6
30 ppmFuran
203-727-3Furfural
98-01-1
250 ppmFurfuryl alcohol
98-00-0
250 ppmGlycidol
556-52-5
500 ppmGraphite (natural)
7782-42-5
N.E.Hafnium compounds (as Hf)
7440-58-6
UnknownHeptachlor
76-44-8
700 mg/m3n-Heptane
142-82-5
5,000 ppmHexachloroethane
67-72-1
300 ppmHexachloronaphthalene
1335-87-1
2 mg/m3Hexafluoroactone
684-16-2n-Hexane
110-54-3
5,000 ppm2-Hexanone
591-78-6
5,000 ppmHexone
108-10-1
3,000 ppmsec Hexyl acetate
108-84-9
4,000 ppmHydrazine
302-01-2
80 ppmHydrogen bromide
10035-10-6
50 ppmHydrogen chloride
7647-01-0
100 ppmHydrogen cyanide
74-90-8
50 ppmHydrogen fluoride (as F)
7664-39-3
30 ppmHydrogen peroxide
7722-84-1
75 ppmHydrogen selenide (as Se)
7783-07-5
2 ppmHydrogen sulfide
7783-06-4
300 ppmHydroquinone
123-31-9
UnknownIodine
7553-56-2
10 ppmIron oxide dust and fume (as Fe)
1309-37-1
N.E.Iron Pentacarbonyl
13463-40-6Isoamyl acetate
123-92-2
3,000 ppmIsoamyl alcohol (primary and secondary)
123-51-3
10,000 ppmIsobutyl acetate
110-19-0
7,500 ppmIsobutyl alcohol
78-83-1
8,000 ppmIsophorone
78-59-1
800 ppmIsopropyl acetate
108-21-4
16,000 ppmIsopropyl alcohol
67-63-0
12,000 ppmIsopropylamine
75-31-0
4,000 ppmIsopropyl ether
108-20-3
10,000 ppmIsopropyl glycidyl ether
4016-14-2
1,000 ppmKetene
463-51-4
UnknownLead compounds (as Pb)
7439-92-1
700 mg Pb/m3Lindane
58-89-9
1,000 mg/m3Lithium hydride
7580-67-8
55 mg/m3L.P.G.
68476-85-7
19,000 ppm [LEL]Magnesium oxide fume
1309-48-4
N.E.Malathion
121-75-5
5,000 mg/m3Maleic anhydride
108-31-6
UnknownManganese compounds (as Mn)
7439-96-5 (metal)
N.E.Mercury compounds [except (organo) alkyls, as Hg]
7439-97-6 (metal)
28 mg Hg/m3Mercury (organo) alkyl compounds(as Hg)
n/a
10 mg Hg/m3Mesityl oxide
141-79-7
5,000 ppmMethoxychlor
72-43-5
N.E.Methyl acetate
79-20-9
10,000 ppmMethyl acetylene
74-99-7
15,000 ppm [LEL]Methyl acetylenepropadiene mixture
59355-75-8
15,000 ppmMethyl acrylate
96-33-3
1,000 ppmMethylal
109-87-5
15,000 ppm [LEL]Methyl alcohol
67-56-1
25,000 ppmMethylamine
74-89-5
100 ppmMethyl (namyl) ketone
110-43-0
4,000 ppmMethyl bromide
74-83-9
2,000 ppmMethyl Cellosolve (r)
109-86-4
2,000 ppmMethyl Cellosolve (r) acetate
110-49-6
4,000 ppmMethyl chloride
74-87-3
10,000 ppmMethyl chloroform
71-55-6
1,000 ppmMethylcyclohexane
108-87-2
10,000 ppmMethylcyclohexanol
25639-42-3
10,000 ppmo-Methylcyclohexanone
583-60-8
2,500 ppmMethylene bisphenyl isocyanate
101-68-8
100 mg/m3Methylene chloride
75-09-2
5,000 ppmMethyl formate
107-31-3
5,000 ppm5-Methyl 3-heptanone
541-85-5
3,000 ppmMethyl hydrazine
60-34-4
50 ppmMethyl iodide
74-88-4
800 ppmMethyl isobutyl carbinol
108-11-2
2,000 ppmMethyl isocyanate
624-83-9
20 ppmMethyl mercaptan
74-93-1
400 ppmMethyl methacrylate
80-62-6
4,000 ppmMethyl styrene
98-83-9
5,000 ppmMica
12001-26-2
N.E.Molybdenum (insoluble compounds, as Mo)
n/a
N.E.Molybdenum (soluble compounds, as Mo)
n/a
N.E.Monomethyl aniline
100-61-8
100 ppmMorpholine
110-91-8
8,000 ppmNaphtha (coal tar)
8030-30-6
10,000 ppm [LEL]Naphthalene
91-20-3
500 ppmNickel carbonyl (as Ni)
13463-39-3
7 ppmNickel metal and other compounds (as Ni)
7440-02-0 (Metal)
N.E.Nicotine
54-11-5
35 mg/m3Nitric acid
7697-37-2
100 ppmNitric oxide
10102-43-9
100 ppmp-Nitroaniline
100-01-6
300 mg/m3Nitrobenzene
98-95-3
200 ppmp-Nitrochlorobenzene
100-00-5
1,000 mg/m3Nitroethane
79-24-3
1,000 ppmNitrogen dioxide
10102-44-0
50 ppmNitrogen trifluoride
7783-54-2
2,000 ppmNitroglycerine
55-63-0
500 mg/m3Nitromethane
75-52-5
1,000 ppm1-Nitropropane
108-03-2
2,300 ppm2-Nitropropane
79-46-9
2,300 ppmNitrotoluene (o, m, p isomers)
88-72-2
200 ppmOctachloronaphthalene
2234-13-1
UnknownOctane
111-65-9
5,000 ppmOil mist (mineral)
8012-95-1
N.E.Osmium tetroxide (as Os)
20816-12-0
1 mg Os/m3Oxalic acid
144-62-7
500 mg/m3Oxygen difluoride
7783-41-7
0.5 ppmOzone
10028-15-6
10 ppmParaquat
1910-42-5
1.5 mg/m3Parathion
56-38-2
20 mg/m3Pentaborane
19624-22-7
3 ppmPentachloronaphthalene
1321-64-8
UnknownPentachlorophenol
87-86-5
150 mg/m3n-Pentane
109-66-0
15,000 ppm [LEL]2-Pentanone
107-87-9
5,000 ppmPerchloromethyl mercaptan
594-42-3
10 ppmPerchloryl fluoride
7616-94-6
385 ppmPetroleum distillates (naphtha)
8002-05-9
10,000 ppmPhenol
108-95-2
250 ppmp-Phenylene diamine
106-50-3
UnknownPhenyl ether (vapor)
101-84-8
N.E.Phenyl etherbiphenyl mixture (vapor)
8004-13-5
N.E.Phenyl glycidyl ether
122-60-1
UnknownPhenylhydrazine
100-63-0
295 ppmPhosdrin
7786-34-7
4 ppmPhosgene
75-44-5
2 ppmPhosphine
7803-51-2
200 ppmPhosphoric acid
7664-38-2
10,000 mg/m3Phosphorus (yellow)
7723-14-0
N.E.Phosphorus pentachloride
10026-13-8
200 mg/m3Phosphorus pentasulfide
1314-80-3
750 mg/m3Phosphorus trichloride
7719-12-2
50 ppmPhthalic anhydride
85-44-9
10,000 mg/m3Picric acid
88-89-1
100 mg/m3Pindone
83-26-1
200 mg/m3Platinum (soluble salts, as Pt)
n/a
N.E.Portland cement
65997-15-1
N.E.Propane
74-98-6
20,000 ppm [LEL]n-Propyl acetate
109-60-4
8,000 ppmn-Propyl alcohol
71-23-8
4,000 ppmPropylene dichloride
78-87-5
2,000 ppmPropylene imine
75-55-8
500 ppmPropylene oxide
75-56-9
2,000 ppmn-Propyl nitrate
627-13-4
2,000 ppmPyrethrum
8003-34-7
5,000 mg/m3Pyridine
110-86-1
3,600 ppmQuinone
106-51-4
300 mg/m3Rhodium (metal fume and insoluble compounds, as Rh)
7440-16-6 (metal)
N.E.Rhodium (soluble compounds, as Rh)
n/a
N.E.Ronnel
299-84-3
5,000 mg/m3Rotenone
83-79-4
UnknownSelenium compounds (as Se)
7782-49-2
UnknownSelenium hexafluoride
7783-79-1
5 ppmSilica, amorphous
7631-86-9
N.E.Silica, crystalline (respirable dust)
14808-60-7
N.E.cristobalite/tridymite
14808-60-7quartz/tripoli
14808-60-7Silver (metal dust and soluble compounds, as Ag)
7440-22-4 (metal)
N.E.Soapstone
n/a
N.E.Sodium fluoroacetate
62-74-8
5 mg/m3Sodium hydroxide
1310-73-2
250 mg/m3Stibine
7803-52-3
40 ppmStoddard solvent
8052-41-3
29,500 mg/m3Strychnine
57-24-9
3 mg/m3Styrene
100-42-5
5,000 ppmSulfur dioxide
7446-09-5
100 ppmSulfuric acid
7664-93-9
80 mg/m3Sulfur monochloride
10025-67-9
10 ppmSulfur pentafluoride
5714-22-7
1 ppmSulfuryl fluoride
2699-79-8
1,000 ppm2,4,5-T
93-76-5
UnknownTalc
14807-96-6
N.E.Tantalum (metal and oxide dust, as Ta)
7440-25-7 (metal)
N.E.TEDP
3689-24-5
35 mg/m3Tellurium compounds (as Te)
13494-80-9
N.E.Tellurium hexafluoride
7783-80-4
1 ppmTEPP
107-49-3
10 mg/m3Terphenyl (o, m, p isomers)
84-15-1
Unknown1,1,1,2-Tetrachloro 2,2-difluoroethane
76-11-9
15,000 ppm1,1,2,2-Tetrachloro 1,2-difluoroethane
76-12-0
15,000 ppm1,1,2,2-Tetrachloroethane
79-34-5
150 ppmTetrachloroethylene
127-18-4
500 ppmTetrachloronaphthalene
1335-88-2
UnknownTetraethyl lead (as Pb)
78-00-2
40 mg Pb/m3Tetrahydrofuran
109-99-9
20,000 ppm [LEL]Tetramethyl lead (as Pb)
75-74-1
40 mg Pb/m3Tetramethyl succinonitrile
3333-52-6
5 ppmTetranitromethane
509-14-8
5 ppmTetryl
479-45-8
N.E.Thallium (soluble compounds, as Tl)
n/a
20 mg Tl/m3Thiram
137-26-8
1,500 mg/m3Tin (inorganic compounds, as Sn)
n/a
400 mg Sn/m3Tin (organic compounds, as Sn)
n/a
UnknownTitanium dioxide
13463-67-7
N.E.Toluene
108-88-3
2,000 ppmToluene 2,4-diisocyanate
584-84-9
10 ppmo-Toluidine
95-53-4
100 ppmTributyl phosphate
126-73-8
125 ppm1,1,2-Trichloroethane
79-00-5
500 ppmTrichloroethylene
79-01-6
1,000 ppmTrichloronaphthalene
1321-65-9
Unknown1,2,3-Trichloropropane
96-18-4
1,000 ppm1,1,2-Trichloro 1,2,2-trifluoroethane
76-13-1
4,500 ppmTriethylamine
121-44-8
1,000 ppmTrifluorobromomethane
75-63-8
50,000 ppm2,4,6-Trinitrotoluene
118-96-7
1,000 mg/m3Triorthocresyl phosphate
78-30-8
40 mg/m3Triphenyl phosphate
115-86-6
N.E.Turpentine
8006-64-2
1,500 ppmUranium (insoluble compounds, as U)
7440-61-1 (metal)
30 mg U/m3Uranium (soluble compounds, as U)
n/a
20 mg U/m3Vanadium dust
1314-62-1
70 mg/m3 (as V2O5)Vanadium fume
1314-62-1
70 mg/m3 (as V2O5)Vinyl toluene
25013-15-4 (inhibited)
5,000 ppmWarfarin
81-81-2
350 mg/m3Xylene (o, m, p isomers)
95-47-6
1,000 ppmXylidine
1300-73-8
150 ppmYttrium compounds (as Y)
7440-65-5
N.E.Zinc chloride fume
7646-85-7
4,800 mg/m3Zinc oxide
1314-13-2
2,500 mg/m3Zirconium compounds (as Zr)
7440-67-7 (Metal)
500 mg Zr/m3Notes
* IDLH values based on the 1994 Revised Criteria

			
							
								Page last reviewed:  February 3, 2017 (archived document)						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Publications & Products
Immediately Dangerous To Life or Health (IDLH) Values
Table of IDLH Values
Criteria for Determining IDLH Values
Historical Documentation
Original (SCP) Values
Abbreviations for IDLH Documentation
Abbreviations for Journal Titles Follow NIOSH Facebook
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