Environmental emergencies: list of exploding or hazardous substances

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Part 1 - Substances likely to explode

Name of the Substance CAS Registry Number UN Number (if applicable) Concentration (%) Threshold Amount (tonnes)
Name of the Substance CAS Registry Number UN Number (if applicable) Concentration (%) Threshold Amount (tonnes)
1,1-difluoroethylene
(vinylidene fluoride)
75-38-7 1959 1% 4.50
1,3-butadiene 106-99-0 1010 1% 4.50
1,3-pentadiene 504-60-9 no number 1% 4.50
1-buten-3-yne
(vinyl acetylene)
689-97-4 no number 1% 4.50
1-butene
(alpha-butylene)
106-98-9 1012 1% 4.50
1-chloropropene
(1-chloropropylene)
590-21-6 no number 1% 4.50
1-pentene 109-67-1 1108 1% 4.50
2,2-dimethylpropane 463-82-1 2044 1% 4.50
2-butene 107-01-7 1055 1% 4.50
2-chloropropane
(isopropyl chloride)
75-29-6 2356 1% 4.50
2-chloropropene
(2-chloropropylene)
557-98-2 2456 1% 4.50
2-methyl-1-butene 563-46-2 2459 1% 4.50
3-methyl-1-butene 563-45-1 2561 1% 4.50
acetaldehyde 75-07-0 1089 1% 4.50
acetylene 74-86-2 1001 1% 4.50
Ammonium nitrate
(in liquid form)
6484-52-2 1942, 2067, 2068, 2069, 2070, 2071, 2072, 2426 81% 20.00
Ammonium nitrate
(in solid form)
6484-52-2 1942, 2067, 2068, 2069, 2070, 2071, 2072, 2426 60% 20.00
ammonium perchlorate 7790-98-9 1442 1% 3.40
benzene 71-43-2 1114 1% 10.00
bromotrifluoroethylene 598-73-2 2419 1% 4.50
butane 106-97-8 1011 1% 4.50
butylene
(butene)
25167-67-3 1012 1% 4.50
carbonyl sulphide
(carbon oxysulfide)
463-58-1 2204 1% 4.50
chlorine monoxide
(dichlorine oxide)
7791-21-1 no number 1% 4.50
cis-2-butene
(2-butene-cis)
590-18-1 1055 1% 4.50
cis-2-pentene
(beta-cis-amylene)
627-20-3 no number 1% 4.50
cyanogen 460-19-5 1026 1% 4.50
cyclohexane 110-82-7 1145 1% 550.00
cyclopropane 75-19-4 1027 1% 4.50
dichlorosilane 4109-96-0 2189 1% 4.50
difluoroethane
(1,1-difluoroethane)
75-37-6 1030 1% 4.50
dimethyl ether
(methyl ether)
115-10-6 1033 1% 4.50
dimethyl sulphide 75-18-3 1164 1% 150.00
dimethylamine 124-40-3 1032 & 1160 1% 4.50
ethane 74-84-0 1035 & 1961 1% 4.50
ethyl chloride 75-00-3 1037 1% 4.50
ethyl ether
(diethyl ether)
60-29-7 1155 1% 4.50
ethyl mercaptan 75-08-1 2363 1% 4.50
ethyl nitrite 109-95-5 1194 1% 4.50
ethylacetylene 107-00-6 2452 1% 4.50
ethylamine 75-04-7 1036 & 2270 1% 4.50
ethylbenzene 100-41-4 1175 1% 7000.00
ethylene 74-85-1 1038 & 1962 1% 4.50
gasoline
(motor fuel)
86290-81-5 1203 1% 150.00
gasoline
(Unleaded)
8006-61-9 1203 1% 150.00
hydrogen 1333-74-0 1966 1% 4.50
hydrogen peroxide 7722-84-1 2015 52% 3.40
isobutane 75-28-5 1969 1% 4.50
isobutylene
(2-methylpropene)
115-11-7 1055 1% 4.50
isopentane
(2-methylbutane)
78-78-4 1265 1% 4.50
isoprene 78-79-5 1218 1% 4.50
isopropylamine 75-31-0 1221 1% 4.50
liquefied natural gas 8006-14-2 1972 1% 4.50
methane 74-82-8 1971 & 1972 1% 4.50
methyl formate 107-31-3 1243 1% 4.50
methylacetylene
(propyne)
74-99-7 1060 1% 4.50
methylamine 74-89-5 1061 1% 4.50
n-pentane
(pentane)
109-66-0 1265 1% 4.50
naphtha 8030-30-6 1268 1% 50.00
propadiene 463-49-0 2200 1% 4.50
propane 74-98-6 1978 1% 4.50
propylene 115-07-1 1077 1% 4.50
silane 7803-62-5 2203 1% 4.50
sodium chlorate 7775-09-9 1495 10% 10.00
Styrene 100-42-5 2055 10% 4.50
tert-butylamine
(2-amino-2-methylpropane)
75-64-9 1125 1% 150.00
tetrafluoroethylene 116-14-3 1081 1% 4.50
tetramethylsilane 75-76-3 2749 1% 4.50
toluene 108-88-3 1294 1% 2500.00
trans-2-butene
(2-butene-trans)
624-64-6 1055 1% 4.50
trans-2-pentene
(trans-beta-amylene)
646-04-8 no number 1% 4.50
trichlorosilane 10025-78-2 1295 1% 4.50
trifluorochloroethylene
(chlorotrifluoroethylene)
79-38-9 1082 1% 4.50
trimethylamine 75-50-3 1083 & 1297 1% 4.50
vinyl chloride 75-01-4 1086 1% 4.50
vinyl ethyl ether
(ethyl vinyl ether)
109-92-2 1302 1% 4.50
vinyl fluoride 75-02-5 1860 1% 4.50
vinyl methyl ether 107-25-5 1087 1% 4.50
vinylidene chloride 75-35-4 1303 1% 4.50
xylenes 1330-20-7 1307 1% 8000.00

Part 2 - Substances hazardous when inhaled

Name of the Substance CAS Registry Number UN Number (if applicable) Concentration (%) Threshold Amount (tonnes)
Name of the Substance CAS Registry Number UN Number (if applicable) Concentration (%) Threshold Amount (tonnes)
1,1-dimethylhydrazine 57-14-7 1163 10% 6.80
Acetic acid 64-19-7 2789, 2790 95% 6.80
acrolein 107-02-8 1092 10% 2.27
acrylonitrile 107-13-1 1093 10% 9.10
acryloyl chloride
(acrylyl chloride)
814-68-6 no number 10% 2.27
allyl alcohol 107-18-6 1098 10% 6.80
allyl chloride 107-05-1 1100 10% 9.10
allylamine 107-11-9 2334 10% 4.50
ammonia solution 7664-41-7 2073 & 2672 20% 9.10
ammonia, anhydrous 7664-41-7 1005 10% 4.50
arsenic trichloride
(arsenous trichloride)
7784-34-1 1560 10% 6.80
arsine 7784-42-1 2188 1% 0.45
boron trichloride 10294-34-5 1741 10% 2.27
boron trifluoride 7637-07-2 1008 10% 2.27
boron trifluoride dimethyl etherate 353-42-4 2965 10% 6.80
bromine 7726-95-6 1744 10% 4.50
carbon disulphide 75-15-0 1131 10% 9.10
carbon monoxide 630-08-0 1016 10% 6.80
chlorine 7782-50-5 1017 10% 1.13
chlorine dioxide 10049-04-4 no number 1% 0.45
chloroform
(trichloromethane)
67-66-3 1888 10% 9.10
chloropicrin
(trichloronitromethane)
76-06-2 1580 10% 2.27
chlorosulphonic acid 7790-94-5 1754 10% 2.27
crotonaldehyde 4170-30-3 1143 10% 9.10
cyanogen bromide 506-68-3 1889 10% 4.50
cyanogen chloride 506-77-4 1589 10% 4.50
cyclohexylamine 108-91-8 2357 10% 6.80
diborane 19287-45-7 1911 10% 1.13
Dichlorodimethyl ether [Bis
(chloromethyl) ether]
542-88-1 2249 1% 0.45
Dichloromethane
(methylene chloride)
75-09-2 1593 1% 9.10
dimethyldichlorosilane
(dichlorodimethylsilane)
75-78-5 1162 10% 2.27
epichlorohydrin 106-89-8 2023 10% 9.10
ethylene chlorohydrin
(2-chloroethanol)
107-07-3 1135 10% 4.50
Ethylene dichloride  
(1,2-Dichloroethane)
107-06-2 1184 10% 6.80
ethylene oxide 75-21-8 1040 10% 4.50
ethylenediamine 107-15-3 1604 10% 9.10
ethyleneimine 151-56-4 1185 10% 4.50
fluorine 7782-41-4 1045 1% 0.45
formaldehyde, solution 50-00-0 1198 & 2209 10% 6.80
furan 110-00-9 2389 10% 2.27
hydrazine 302-01-2 2029 10% 6.80
hydrochloric acid 7647-01-0 1789 30% 6.80
hydrofluoric acid 7664-39-3 1790 50% 0.45
hydrogen bromide
(hydrobromic acid)
10035-10-6 1048 & 1788 10% 1.13
hydrogen chloride, anhydrous 7647-01-0 2186 & 1050 10% 2.27
hydrogen cyanide
(hydrocyanic acid)
74-90-8 1051 & 1613 & 1614 10% 1.13
hydrogen fluoride, anhydrous 7664-39-3 1052 1% 0.45
hydrogen selenide 7783-07-5 2202 1% 0.22
hydrogen sulphide 7783-06-4 1053 10% 4.50
iron pentacarbonyl 13463-40-6 1994 10% 1.13
isobutyronitrile 78-82-0 2284 10% 9.10
isopropyl chloroformate 108-23-6 2407 10% 6.80
ketene 463-51-4 no number 1% 0.22
mercury 7439-97-6 2809 N/A 1.00
methyl bromide 74-83-9 1062 10% 2.27
methyl chloride 74-87-3 1063 10% 4.50
methyl chloroformate 79-22-1 1238 10% 2.27
Methyl chloromethyl ether
(Chloromethyl methyl ether)
107-30-2 1239 10% 2.27
methyl iodide 74-88-4 2644 10% 4.50
methyl isocyanate 624-83-9 2480 10% 4.50
methyl mercaptan 74-93-1 1064 10% 4.50
methyl thiocyanate 556-64-9 no number 10% 9.10
methylacrylonitrile 126-98-7 3079 10% 4.50
methylhydrazine
(monomethyl hydrazine)
60-34-4 1244 10% 6.80
methyltrichlorosilane 75-79-6 1250 10% 2.27
n-propyl chloroformate
(propyl chloroformate)
109-61-5 2740 10% 6.80
nickel carbonyl 13463-39-3 1259 1% 0.45
nitric acid 7697-37-2 2031 & 2032 80% 6.80
nitric oxide
(nitrogen monoxide)
10102-43-9 1660 10% 4.50
nitrogen dioxide 10102-44-0 1067 10% 1.13
osmium tetroxide 20816-12-0 2471 1% 0.22
perchloromethyl mercaptan 594-42-3 1670 10% 4.50
perchloryl fluoride
(trioxychlorofluoride)
7616-94-6 3083 10% 6.80
peroxyacetic acid
(peracetic acid)
79-21-0 3107 10% 4.50
phenol 108-95-2 1671 & 2312 & 2821 10% 9.10
phosgene 75-44-5 1076 1% 0.22
phosphine 7803-51-2 2199 10% 2.27
phosphorus oxychloride 10025-87-3 1810 10% 2.27
phosphorus trichloride 7719-12-2 1809 10% 6.80
phosphorus, white 7723-14-0 2447 N/A 1.00
piperidine 110-89-4 2401 10% 6.80
propionitrile 107-12-0 2404 10% 4.50
propylene oxide 75-56-9 1280 10% 4.50
propyleneimine 75-55-8 1921 10% 4.50
stibine 7803-52-3 2676 10% 2.27
sulphur dioxide 7446-09-5 1079 10% 2.27
Sulphur hexafluoride
(Sulfur hexafluoride)
2551-62-4 1080 10% 9.10
sulphur tetrafluoride 7783-60-0 2418 10% 1.13
sulphur trioxide 7446-11-9 1829 10% 4.50
sulphuric acid, fuming
(oleum)
8014-95-7 1831 10% 4.50
tetraethyl lead 78-00-2 1649 10% 2.27
tetramethyl lead 75-74-1 no number 10% 4.50
tetranitromethane 509-14-8 1510 10% 4.50
thionyl chloride 7719-09-7 1836 10% 6.80
titanium tetrachloride 7550-45-0 1838 10% 1.13
toluene diisocyanate 26471-62-5 2078 10% 4.50
toluene-2,4-diisocyanate 584-84-9 2078 10% 4.50
toluene-2,6-diisocyanate 91-08-7 2078 10% 4.50
trans-crotonaldehyde 123-73-9 1143 10% 9.10
trimethylchlorosilane
(chlorotrimethylsilane)
75-77-4 1298 10% 4.50
vinyl acetate 108-05-4 1301 10% 6.80

Part 3 - Other hazardous Substances

Name of the Substance CAS Registry Number UN Number (if applicable) Concentration (%) Threshold Amount (tonnes)
Name of the Substance CAS Registry Number UN Number (if applicable) Concentration (%) Threshold Amount (tonnes)
3,3'-dichlorobenzidine 91-94-1 no number 1% 1.13
4-tert-Nonylphenol 84852-15-3 no number 10% 1.13
Arsenic 7440-38-2 1558 10% 0.22
Arsenic acid 7778-39-4 1553, 1554 10% 0.22
Arsenic pentoxide 1303-28-2 1559 10% 0.22
Arsenic trioxide
(Arsenic(III) oxide)
1327-53-3 1561 10% 0.22
Cadmium chloride 10108-64-2 no number 10% 0.22
Cadmium oxide 1306-19-0 no number 10% 0.22
Cadmium sulphate 10124-36-4 no number 10% 0.22
Cadmium sulphide 1306-23-6 no number 10% 0.22
Chromic acid 7738-94-5 1463, 1755 10% 0.22
Chromium trioxide 1333-82-0 1463, 1755 10% 0.22
Naphthalene
(in liquid form)
91-20-3 2304 10% 4.50
Nickel acetate 373-02-4 no number 10% 0.22
Nickel ammonium sulphate
(nickel ammonium sulfate)
15699-18-0 no number 10% 0.22
Nickel carbonate 3333-67-3 no number 10% 0.22
Nickel chloride 7718-54-9 no number 10% 0.22
Nickel nitrate
(Nickel(II) nitrate)
13138-45-9 2725 10% 0.22
Nickel oxide 1313-99-1 no number 10% 0.22
Nickel(II) nitrate, hexahydrate 13478-00-7 2725 10% 0.22
Nickel(II) sulphate
(Nickel(II) sulfate)
7786-81-4 no number 10% 0.22
Nickel(II) sulphate, hexahydrate
(Nickel(II) sulfate, hexahydrate)
10101-97-0 no number 10% 0.22
Nonylphenol
(mixed isomers)
25154-52-3 no number 10% 1.13
p-Nonylphenol 104-40-5 no number 10% 1.13
Potassium chromate 7789-00-6 no number 10% 0.22
Sodium arsenate, dibasic 7778-43-0 1685 10% 0.22
Sodium arsenate, dibasic, heptahydrate 10048-95-0 1685 10% 0.22
Sodium arsenite 7784-46-5 1686, 2027 10% 0.22
Sodium chromate 7775-11-3 no number 10% 0.22
Sodium dichromate 10588-01-9 no number 10% 0.22
Tetrachloroethylene
(Perchloroethylene)
127-18-4 1897 1% 1.13
Tetrachloromethane
(Carbon tetrachloride)
56-23-5 1846 1% 0.22
Tributyl tetradecyl phosphonium chloride
(TTPC)
81741-28-8 no number 10% 0.22
Trichloroethylene
(TCE)
79-01-6 1710 1% 1.13
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