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Home > Programs > Bureau of Environmental Protection > Air > Accidental Release Prevention Program > Regulated Substance
112(r) Regulated Substances
Toxic Substances
Flammable Substances

TOXIC Substances
Chemical Name
CAS # Threshold
Quantity
(lbs)
Basis
for
Listing
Acrolein [2-Propenal]
107-02-8
5,000
b
Acrylonitrile [2-Propenenitrile]
107-13-1
20,000
b
Acrylyl chloride [2-Propenoyl chloride]
814-68-6
5,000
b
Allyl alcohol [2-Propen-1-ol]
107-18-6
15,000
b
Allylamine [2-Propen-1-amine]
107-11-9
10,000
b
Ammonia (anhydrous)
7664-41-7
10,000
a, b
Ammonia (conc 20% or greater)
7664-41-7
20,000
a, b
Arsenous trichloride
7784-34-1
15,000
b
Arsine
7784-42-1
1,000
b
Boron trichloride [Borane, trichloro-]
10294-34-5
5,000
b
Boron trifluoride [Borane, trifluoro-]
7637-07-2
5,000
b
Boron trifluoride compound with methyl ether (1:1) [Boron, trifluoro[oxybis[metane]]-, T-4-
353-42-4
15,000
b
Bromine
7726-95-6
10,000
a, b
Carbon disulfide
75-15-0
20,000
b
Chlorine
7782-50-5
2,500
a, b
Chlorine dioxide [Chlorine oxide (ClO2)]
10049-04-4
1,000
c
Chloroform [Methane, trichloro-]
67-66-3
20,000
b
Chloromethyl ether [Methane, oxybis[chloro-]
542-88-1
1,000
b
Chloromethyl methyl ether [Methane, chloromethoxy-]
107-30-2
5,000
b
Crotonaldehyde [2-Butenal]
4170-30-3
20,000
b
Crotonaldehyde, (E)- [2-Butenal, (E)-]
123-73-9
20,000
b
Cyanogen chloride
506-77-4
10,000
c
Cyclohexylamine [Cyclohexanamine]
108-91-8
15,000
b
Diborane
19287-45-7
2,500
b
Dimethyldichlorosilane [Silane, dichlorodimethyl-]
75-78-5
5,000
b
1,1-Dimethylhydrazine [Hydrazine, 1,1-dimethyl-]
57-14-7
15,000
b
Epichlorohydrin [Oxirane, (chloromethyl)-]
106-89-8
20,000
b
Ethylenediamine [1,2-Ethanediamine]
107-15-3
20,000
b
Ethyleneimine [Aziridine]
151-56-4
10,000
b
Ethylene oxide [Oxirane]
75-21-8
10,000
a, b
Fluorine
7782-41-4
1,000
b
Formaldehyde (solution)
50-00-0
15,000
b
Furan
110-00-9
5,000
b
Hydrazine
302-01-2
15,000
b
Hydrochloric acid (conc 37% or greater)
7647-01-0
15,000
d
Hydrocyanic acid
74-90-8
2,500
a, b
Hydrogen chloride (anhydrous) [Hydrochloric acid]
7647-01-0
5,000
a
Hydrogen fluoride/Hydrofluoric acid (conc 50% or greater) [Hydrofluoric acid]
7664-39-3
1,000
a, b
Hydrogen selenide
7783-07-5
500
b
Hydrogen sulfide
7783-06-4
10,000
a, b
Iron, pentacarbonyl- [Iron carbonyl (Fe(CO)5), (TB-5-11)-]
13463-40-6
2,500
b
Isobutyronitrile [Propanenitrile, 2-methyl-]
78-82-0
20,000
b
Isopropyl chloroformate [Carbonochloridic acid, 1-methylethyl ester]
108-23-6
15,000
b
Methacrylonitrile [2-Propenenitrile, 2-methyl-]
126-98-7
10,000
b
Methyl chloride [Methane, chloro-]
74-87-3
10,000
a
Methyl chloroformate [Carbonochloridic acid, methylester]
79-22-1
5,000
b
Methyl hydrazine [Hydrazine, methyl-]
60-34-4
15,000
b
Methyl isocyanate [Methane, isocyanato-]
624-83-9
10,000
a, b
Methyl mercaptan [Methanethiol]
74-93-1
10,000
b
Methyl thiocyanate [Thiocyanic acid, methyl ester]
556-64-9
20,000
b
Methyltrichlorosilane [Silane, trichloromethyl-]
75-79-6
5,000
b
Nickel carbonyl
13463-39-3
1,000
b
Nitric acid (conc 80% or greater)
7697-37-2
15,000
b
Nitric oxide [Nitrogen oxide (NO)]
10102-43-9
10,000
b
Oleum (Fuming Sulfuric acid) [Sulfuric acid, mixture with sulfur trioxide]1
8014-95-7
10,000
e
Peracetic acid [Ethaneperoxoic acid]
79-21-0
10,000
b
Perchloromethylmercaptan [Methanesulfenyl chloride, trichloro-]
594-42-3
10,000
b
Phosgene [Carbonic dichloride]
75-44-5
500
a, b
Phosphine
7803-51-2
5,000
b
Phosphorus oxychloride [Phosphoryl chloride]
10025-87-3
5,000
b
Phosphorus trichloride [Phosphorous trichloride]
7719-12-2
15,000
b
Piperidine
110-89-4
15,000
b
Propionitrile [Propanenitrile]
107-12-0
10,000
b
Propyl chloroformate [Carbonochloridic acid, propylester]
109-61-5
15,000
b
Propyleneimine [Aziridine, 2-methyl-]
75-55-8
10,000
b
Propylene oxide [Oxirane, methyl-]
75-56-9
10,000
b
Sulfur dioxide (anhydrous)
7446-09-5
5,000
a, b
Sulfur tetrafluoride [Sulfur fluoride (SF4), (T-4)-]
7783-60-0
2,500
b
Sulfur trioxide
7446-11-9
10,000
a, b
Tetramethyllead [Plumbane, tetramethyl-]
75-74-1
10,000
b
Tetranitromethane [Methane, tetranitro-]
509-14-8
10,000
b
Titanium tetrachloride [Titanium chloride (TiCl4) (T-4)-]
7550-45-0
2,500
b
Toluene 2,4-diisocyanate [Benzene, 2,4-diisocyanato-1-methyl-]1
584-84-9
10,000
a
Toluene 2,6-diisocyanate [Benzene, 1,3-diisocyanato-2-methyl-]1
91-08-7
10,000
a
Toluene diisocyanate (unspecified isomer) [Benzene, 1,3-diisocyanatomethyl-]1
26471-62-5
10,000
a
Trimethylchlorosilane [Silane, chlorotrimethyl-]
75-77-4
10,000
b
Vinyl acetate monomer [Acetic acid ethenyl ester]
108-05-4
15,000
b

Basis for Listing:
a - Mandated for listing by Congress.
b - On EHS list, vapor pressure 10 mmHg or greater.
c - Toxic gas
d - Toxicity of hydrogen chloride, potential to release hydrogen chloride, and history of accidents.
e - Toxicity of sulfur trioxide and sulfuric acid, potential to release sulfur trioxide, and history of accidents.
1 The mixture exemption in 40 CFR 68.115(b)(1) does not apply to the substance.
112 (r) Regulated Flammable Substances

FLAMMABLE Substances
Chemical Name

CAS # Threshold
Quantity
(lbs)
Basis
for
Listing
Acetaldehyde
75-07-0
10,000
g
Acetylene [Ethyne]
74-86-2
10,000
f
Bromotrifluorethylene [Ethene, bromotrifluoro-]
598-73-2
10,000
f
1,3-Butadiene
106-99-0
10,000
f
Butane
106-97-8
10,000
f
1-Butene
106-98-9
10,000
f
2-Butene
107-01-7
10,000
f
Butene
25167-67-3
10,000
f
2-Butene-cis
590-18-1
10,000
f
2-Butene-trans [2-Butene, (E)]
624-64-6
10,000
f
Carbon oxysulfide [Carbon oxide sulfide (COS)]
463-58-1
10,000
f
Chlorine monoxide [Chlorine oxide]
7791-21-1
10,000
f
2-Chloropropylene [1-Propene, 2-chloro-]
557-98-2
10,000
g
1-Chloropropylene [1-Propene, 1-chloro-]
590-21-6
10,000
g
Cyanogen [Ethanedinitrile]
460-19-5
10,000
f
Cyclopropane
75-19-4
10,000
f
Dichlorosilane [Silane, dichloro-]
4109-96-0
10,000
f
Difluoroethane [Ethane, 1,1-difluoro-]
75-37-6
10,000
f
Dimethylamine [Methanamine, N-methyl-]
124-40-3
10,000
f
2,2-Dimethylpropane [Propane, 2,2-dimethyl-]
463-82-1
10,000
f
Ethane
74-84-0
10,000
f
Ethyl acetylene [1-Butyne]
107-00-6
10,000
f
Ethylamine [Ethanamine]
75-04-7
10,000
f
Ethyl chloride [Ethane, chloro-]
75-00-3
10,000
f
Ethylene [Ethene]
74-85-1
10,000
f
Ethyl ether [Ethane, 1,1'-oxybis-]
60-29-7
10,000
g
Ethyl mercaptan [Ethanethiol]
75-08-1
10,000
g
Ethyl nitrite [Nitrous acid, ethyl ester]
109-95-5
10,000
f
Hydrogen
1333-74-0
10,000
f
Isobutane [Propane, 2-methyl]
75-28-5
10,000
f
Isopentane [Butane, 2-methyl-]
78-78-4
10,000
g
Isoprene [1,3-Butadiene, 2-methyl-]
78-79-5
10,000
g
Isopropylamine [2-Propanamine]
75-31-0
10,000
g
Isopropyl chloride [Propane, 2-chloro-]
75-29-6
10,000
g
Methane
74-82-8
10,000
f
Methylamine [Methanamine]
74-89-5
10,000
f
3-Methyl-1-butene
563-45-1
10,000
f
2-Methyl-1-butene
563-46-2
10,000
g
Methyl ether [Methane, oxybis-]
115-10-6
10,000
f
Methyl formate [Formic acid, methyl ester]
107-31-3
10,000
g
2-Methylpropene [1-Propene, 2-methyl-]
115-11-7
10,000
f
1,3-Pentadiene
504-60-9
10,000
f
Pentane
109-66-0
10,000
g
1-Pentene
109-67-1
10,000
g
2-Pentene, (E)-
646-04-8
10,000
g
2-Pentene, (Z)-
627-20-3
10,000
g
Propadiene [1,2-Propadiene]
463-49-0
10,000
f
Propane
74-98-6
*
f
Propylene [1-Propene]
115-07-1
10,000
f
Propyne [1-Propyne]
74-99-7
10,000
f
Silane
7803-62-5
10,000
f
Tetrafluoroethylene [Ethene, tetrafluoro-]
116-14-3
10,000
f
Tetramethylsilane [Silane, tetramethyl-]
75-76-3
10,000
g
Trichlorosilane [Silane, trichloro-]
10025-78-2
10,000
g
Trifluorochloroethylene [Ethene, chlorotrifluoro-]
79-38-9
10,000
f
Trimethylamine [Methanamine, N,N-dimethyl-]
75-50-3
10,000
f
Vinyl acetylene [1-Buten-3-yne]
689-97-4
10,000
f
Vinyl chloride [Ethene, chloro-]
75-01-4
10,000
a, f
Vinyl ethyl ether [Ethene, ethoxy-]
109-92-2
10,000
g
Vinyl fluoride [Ethene, fluoro-]
75-02-5
10,000
f
Vinylidene chloride [Ethene, 1,1-dichloro-]
75-35-4
10,000
g
Vinylidene fluoride [Ethene, 1,1-difluoro-]
75-38-7
10,000
f
Vinyl methyl ether [Ethene, methoxy-]
107-25-5
10,000
f
Basis for Listing:
a - Mandated for listing by Congress.
f - Flammable gas.
g - Volatile flammable liquid.

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