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Chapter 4. Division of Industrial Safety
Subchapter 7. General Industry Safety Orders
Group 16. Control of Hazardous Substances
Article 109. Hazardous Substances and Processes

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§Appendix A to Section 5189 - List of Acutely Hazardous Chemicals, Toxics and Reactives (Mandatory)


This Appendix contains a listing of substances which present a potential for a catastrophic event at or above the threshold quantity (TQ).
CHEMICAL name
CAS *
TQ **
Acetaldehyde
 
75-07-0
2500
Acrolein (2-Propenal)
 
107-02-8
150
Acrylyl Chloride
 
814-68-6
250
Allyl Chloride
 
107-05-1
1000
Allylamine
 
107-11-9
1000
Alkylaluminums
 
Varies
5000
Ammonia, Anhydrous
 
7664-41-7
10000
Ammonia solutions (> 44% ammonia by weight
 
7664-41-7
15000
Ammonium Perchlorate
 
7790-98-9
7500
Ammonium Permanganate
 
7787-36-2
7500
Arsine (also called Arsenic Hydride)
 
7784-42-1
100
Bis(Chloromethyl) Ether
 
542-88-1
100
Boron Trichloride
 
10294-34-5
2500
Boron Trifluoride
 
7637-07-2
250
Bromine
 
7726-95-6
1500
Bromine Chloride
 
13863-41-7
1500
Bromine Pentafluoride
 
7789-30-2
2500
Bromine Trifluoride
 
7787-71-5
15000
3-Bromopropyne (also called Propargyl Bromide)
 
106-96-7
100
Butyl Hydroperoxide (Tertiary)
 
75-91-2
5000
Butyl Perbenzoate (Tertiary)
 
614-45-9
7500
Carbonyl Chloride (see Phosgene)
 
75-44-5
100
Carbonyl Fluoride
 
353-50-4
2500
Carbonyl Nitrate (concentration > 12.6% nitrogen)
 
9004-70-0
2500
Chlorine
 
7782-50-5
1500
Chlorine Dioxide
 
10049-04-4
1000
Chlorine Pentrafluoride
 
13637-63-3
1000
Chlorine Trifluoride
 
7790-91-2
1000
Chlorodiethylaluminum (also called Diethylaluminum Chloride)
 
96-10-6
5000
1-Chloro-2,4-Dinitrobenzene
 
97-00-7
5000
Chloromethyl Methyl Ether
 
107-30-2
500
Chloropicrin
 
76-06-2
500
Chloropicrin and Methyl Bromide mixture
 
None
1500
Chloropicrin and Methyl Chloride mixture
 
None
1500
Cumene Hydroperoxide
 
80-15-9
5000
Cyanogen
 
460-19-5
2500
Cyanogen Chloride
 
506-77-4
500
Cyanuric Fluoride
 
675-14-9
100
Diacetyl Peroxide (Concentration > 70%)
 
110-22-5
5000
Diazomethane
 
334-88-3
500
Dibenzoyl Peroxide
 
94-36-0
7500
Diborane
 
19287-45-7
100
Dibutyl Peroxide (Tertiary)
 
110-05-4
5000
Dichloro Acetylene
 
7572-29-4
250
Dichlorosilane
 
4109-96-0
2500
Diethylzinc
 
557-20-0
10000
Diisopropyl Peroxydicarbonate
 
105-64-6
7500
Dilaluroyl Peroxide
 
105-74-8
7500
Dimethyldichlorosilane
 
75-78-5
1000
Dimethylhydrazine, 1,1-
 
57-14-7
1000
Dimethylamine, Anhydrous
 
124-40-3
2500
2,4-Dinitroaniline
 
97-02-9
5000
Ethyl Methyl Ketone Peroxide (also
Methyl Ethyl Ketone Peroxide;
concentration > 60%)
 
1338-23-4
5000
Ethyl Nitrite
 
109-95-5
5000
Ethylamine
 
75-04-7
7500
Ethylene Fluorohydrin
 
371-62-0
100
Ethylene Oxide
 
75-21-8
5000
Ethyleneimine
 
151-56-4
1000
Fluorine
 
7782-41-4
1000
Formaldehyde (Formalin)
 
50-00-0
1000
Furan
 
110-00-9
500
Hexafluoroacetone
 
684-16-2
5000
Hydrochloric Acid, Anhydrous
 
7647-01-0
500
Hydrofluoric Acid, Anhydrous
 
7664-39-3
1000
Hydrogen Bromide
 
10035-10-6
5000
Hydrogen Chloride
 
7647-01-0
5000
Hydrogen Cyanide, Anhydrous
 
74-90-8
1000
Hydrogen Fluoride
 
7664-39-3
1000
Hydrogen Peroxide (52% by weight
or greater
 
7722-84-1
7500
Hydrogen Selenide
 
7783-07-5
150
Hydrogen Sulfide
 
7783-06-4
1500
Hydroxylamine
 
7803-49-8
2500
Iron, Pentacarbonyl
 
13463-40-6
250
Isopropylamine
 
75-31-0
5000
Ketene
 
463-51-4
100
Methacrylaldehyde
 
78-85-3
1000
Methacryloyl Chloride
 
920-46-7
150
Methacryloyloxyethyl Isocyanate
 
30674-80-7
100
Methyl Acrylonitrile
 
126-98-7
250
Methylamine, Anhydrous
 
74-89-5
1000
Methyl Bromide
 
74-83-9
2500
Methyl Chloride
 
74-87-3
15000
Methyl Chloroformate
 
79-22-1
500
Methyl Ethyl Ketone Peroxide
(concentration > 60%)
 
1338-23-4
5000
Methyl Fluoroacetate
 
453-18-9
100
Methyl Fluorosulfate
 
421-20-5
100
Methyl Hydrazine
 
60-34-4
100
Methyl Iodide
 
74-88-4
7500
Methyl Isocyanate
 
624-83-9
250
Methyl Mercaptan
 
74-93-1
5000
Methyl Vinyl Ketone
 
78-94-4
100
Methyltrichlorosilane
 
75-79-6
500
Nickel Carbonly (Nickel
Tetracarbonyl)
 
13463-39-3
150
Nitric Acid (94.5% by weight or
greater)
 
7697-37-2
500
Nitric Oxide
 
10102-43-9
250
Nitroaniline (para Nitroaniline
 
100-01-6
5000
Nitromethane
 
75-52-5
2500
Nitrogen Dioxide
 
10102-44-0
250
Nitrogen Oxides (NO; NO 2; N204;
N203)
 
10102-44-0
250
Nitrogen Tetroxide (also called Nitro
gen Peroxide)
 
10544-72-6
250
Nitrogen Trifluoride
 
7783-54-2
5000
Nitrogen Trioxide
 
10544-73-7
250
Oleum (65% to 80% by weight; also
called Fuming Sulfuric Acid)
 
8014-95-7
1000
Osmium Tetroxide
 
20816-12-0
100
Oxygen Difluoride (Fluorine Monox-
ide)
 
7783-41-7
100
Ozone
 
10028-15-6
100
Pentaborane
 
19624-22-7
100
Peracetic Acid (concentration > 60%
Acetic Acid; also called
Peroxyacetic Acid)
 
79-21-0
1000
Perchloric Acid (concentration > 60%
by weight)
 
7601-90-3
5000
Perchloromethyl Mercaptan
 
594-42-3
150
Perchloryl Fluoride
 
7616-94-6
5000
Peroxyacetic Acid (concentration >
60% Acetic Acid; also called
Peracetic Acid)
 
79-21-0
1000
Phosgene (also called Carbonyl
Chloride)
 
75-44-5
100
Phosphine (Hydrogen Phosphide)
 
7803-51-2
100
Phosphorus Oxychloride (also called
Phosphoryl Chloride)
 
10025-87-3
1000
Phosphorus Trichloride
 
7719-12-2
1000
Phosphoryl Chloride (also called
Phosphorus Oxychloride)
 
10025-87-3
1000
Propargyl Bromide
 
106-96-7
100
Propyl Nitrate
 
627-3-4
2500
Sarin
 
107-44-8
100
Selenium Hexafluoride
 
7783-79-1
1000
Stibine (Antimony Hydride)
 
7803-52-3
500
Sulfur Dioxide (liquid)
 
7446-09-5
1000
Sulfur Pentafluoride
 
5714-22-7
250
Sulfur Tetrafluoride
 
7783-60-0
250
Sulfur Trioxide (also called Sulfuric
Anhydride)
 
7446-11-9
1000
Sulfuric Anhydride (also called Sulfur
Trioxide)
 
7446-11-9
1000
Tellurium Hexafluoride
 
7783-80-4
250
Tetrafluoroethylene
 
116-14-3
5000
Tetrafluorohydrazine
 
10036-47-2
5000
Tetramethyl Lead
 
75-74-1
1000
Thionyl Chloride
 
7719-09-7
250
Trichloro (chloromethyl) Silane
 
1558-25-4
100
Trichloro (dichlorophenyl) Silane
 
27137-85-5
2500
Trichlorosilane
 
10025-78-2
5000
Trifluorochloroethylene
 
79-38-9
10000
Trimethyoxysilane
 
2487-90-3
1500
*Chemical Abstract Service Number.
**Threshold Quantity in Pounds (Amount necessary to be covered by this standard).
Note: Authority cited: Section 142.3, Labor Code. Reference: Sections 142.3 and 7856, Labor Code.


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