Environmental emergencies: list of exploding or hazardous substances

This list of substances is divided into three parts.  Each can be displayed in ascending or descending order by clicking on the appropriate arrow in any of the headings.

Part 1 - Substances that are likely to explode

Name of the substance CAS registry number UN number (if applicable) Concentration (% mass/mass) Minimum quantity (tonnes)

Ethyl ether (diethyl ether)

60-29-7

1155

1

4.50

Benzene

71-43-2

1114

1

10

Methane

74-82-8

1971 & 1972

1

4.50

Ethane

74-84-0

1035 & 1961

1

4.50

Ethylene

74-85-1

1038 & 1962

1

4.50

Acetylene

74-86-2

1001

1

4.50

Methylamine

74-89-5

1061

1

4.50

Propane

74-98-6

1978

1

4.50

Methylacetylene (propyne)

74-99-7

1060

1

4.50

Ethyl chloride

75-00-3

1037

1

4.50

Vinyl chloride

75-01-4

1086

1

4.50

Vinyl fluoride

75-02-5

1860

1

4.50

Ethylamine

75-04-7

1036 & 2270

1

4.50

Acetaldehyde

75-07-0

1089

1

4.50

Ethyl mercaptan

75-08-1

2363

1

4.50

Dimethyl sulphide

75-18-3

1164

1

150

Cyclopropane

75-19-4

1027

1

4.50

Isobutane

75-28-5

1969

1

4.50

2-Chloropropane (isopropyl chloride)

75-29-6

1027

1

4.50

Isopropylamine

75-31-0

1221

1

4.50

Vinylidene chloride

75-35-4

1303

1

4.50

Difluoroethane (1,1-difluoroethane)

75-37-6

1030

1

4.50

1,1-Difluoroethylene (vinylidene fluoride)

75-38-7

1959

1

4.50

Trimethylamine

75-50-3

1083 & 1297

1

4.50

tert-Butylamine (2-amino-2-methylpropane)

75-64-9

1125

1

150

Tetramethylsilane

75-76-3

2749

1

4.50

Isopentane (2-Methylbutane)

78-78-4

1265

1

4.50

Isoprene

78-79-5

1218

1

4.50

Trifluorochloroethylene (chlorotrifluoroethylene)

79-38-9

1082

1

4.50

Ethylbenzene

100-41-4

1175

1

7000

Styrene

100-42-5

2055

10

4.50

Butane

106-97-8

1011

1

4.50

1-Butene (alpha-butylene)

106-98-9

1012

1

4.50

1,3-Butadiene

106-99-0

1010

1

4.50

Ethylacetylene

107-00-6

2452

1

4.50

2-Butene

107-01-7

1055

1

4.50

Vinyl methyl ether

107-25-5

1087

1

4.50

Methyl formate

107-31-3

1243

1

4.50

Toluene

108-88-3

1294

1

2500

n-pentane (Pentane)

109-66-0

1265

1

4.50

1-Pentene

109-67-1

1108

1

4.50

Vinyl ethyl ether (ethyl vinyl ether)

109-92-2

1302

1

4.50

Ethyl nitrite

109-95-5

1194

1

4.50

Cyclohexane

110-82-7

1145

1

550

Propylene

115-07-1

1077

1

4.50

Dimethyl ether (methyl ether)

115-10-6

1033

1

4.50

Isobutylene (2-Methylpropene)

115-11-7

1055

1

4.50

Tetrafluoroethylene

116-14-3

1081

1

4.50

Dimethylamine

124-40-3

1032 & 1160

1

4.50

Cyanogen

460-19-5

1026

1

4.50

Propadiene

463-49-0

2200

1

4.50

Carbonyl sulphide (cabon oxysulfide)

463-58-1

2204

1

4.50

2,2-Dimethylpropane

463-82-1

2044

1

4.50

1,3-Pentadiene

504-60-9

No number

1

4.50

2-Chloropropene (2-chloropropylene)

557-98-2

2456

1

4.50

3-Methyl-1-butene

563-45-1

2561

1

4.50

2-Methyl-1-butene

563-46-2

2459

1

4.50

Cis-2-Butene (2-butene-cis)

590-18-1

1055

1

4.50

1-Chloropropene (1-chloropropylene)

590-21-6

No number

1

4.50

Bromotrifluoroethylene

598-73-2

2419

1

4.50

trans-2-Butene (2-Butene-trans)

624-64-6

1055

1

4.50

Cis-2-Pentene (beta-cis-amylene)

627-20-3

No number

1

4.50

trans-2-Pentene (trans-beta-amylene)

646-04-8

No number

1

4.50

1-Buten-3-yne (vinyl acetylene)

689-97-4

No number

1

4.50

Xylenes

1330-20-7

1307

1

8000

Hydrogen

1333-74-0

1966

1

4.50

Dichlorosilane

4109-96-0

2189

1

4.50

Ammonium nitrate, solid

6484-52-2

1942, 2067, 2068, 2069, 2070, 2071, 2072 & 2426

60

20

Ammonium nitrate, solution

6484-52-2

1942, 2067, 2068, 2069, 2070, 2071, 2072 & 2426

81

20

Hydrogen peroxide

7722-84-1

2015

10

9.10

Sodium chlorate

7775-09-9

1495

10

6.80

Ammonium perchlorate

7790-98-9

1442

10

4.50

chlorine monoxide (dichlorine oxide)

7791-21-1

No number

10

4.50

Silane

7803-62-5

2203

10

4.50

Liquefied natural gas

8006-14-2

1972

10

9.10

Unleaded gasoline

8006-61-9

1203

10

9.10

Naphtha

8030-30-6

1268

10

6.80

Trichlorosilane

10025-78-2

1295

1

4.50

Butylene (butene)

25167-67-3

1012

10

2.27

Gasoline (motor fuel)

86290-81-5

1203

1

4.50

Part 2 - Substances hazardous when inhaled

Name of the substance CAS registry number UN number (if applicable) Concentration (% mass/mass) Minimum quantity (tonnes)

Formaldehyde, solution

50-00-0

1198 & 2209

10

6.80

1,1-Dimethylhydrazine

57-14-7

1163

10

6.80

Methylhydrazine (monomethyl hydrazine)

60-34-4

1244

10

6.80

Acetic acid

64-19-7

2789 & 2790

95

6.80

Chloroform (trochloromethane)

67-66-3

1888

10

9.10

Methyl bromide

74-83-9

1062

10

2.27

Methyl chloride

74-87-3

1063

10

4.50

Methyl iodide

74-88-4

2644

10

4.50

Hydrogen cyanide (Hydrocyanic acid)

74-90-8

1051, 1613 & 1614

10

1.13

Methyl mercaptan

74-93-1

1064

10

4.50

Dichloromethane (methylene chloride)

75-09-2

1593

1

9.10

Carbon disulphide

75-15-0

1131

10

9.10

Ethylene oxide

75-21-8

1040

10

4.50

Phosgene

75-44-5

1076

1

0.22

Propyleneimine

75-55-8

1921

10

4.50

Propylene oxide

75-56-9

1280

10

4.50

Tetramethyl lead

75-74-1

No number

10

4.50

Trimethylchlorosilane (chlorotrimethysilane)

75-77-4

1298

10

4.50

Dimethyldichlorosilane (dichlorodimethylsilane)

75-78-5

1162

10

2.27

Methyltrichlorosilane

75-79-6

1250

10

2.27

Chloropicrin (trichloronitromethane)

76-06-2

1580

10

2.27

Tetraethyl lead

78-00-2

1649

10

2.27

Isobutyronitrile

78-82-0

2284

10

9.10

Peroxyacetic acid (peracetic acid)

79-21-0

3107

10

4.50

Methyl chloroformate

79-22-1

1238

10

2.27

Toluene-2,6-diisocyanate

91-08-7

2078

10

4.50

Epichlorohydrin

106-89-8

2023

10

9.10

Acrolein

107-02-8

1092

10

2.27

Allyl chloride

107-05-1

1100

10

9.10

Ethylene dichloride (1,2-dichloroethane)

107-06-2

1184

10

6.80

Ethylene chlorohydrin (2-Chloroethanol)

107-07-3

1135

10

4.50

Allylamine

107-11-9

2334

10

4.50

Propionitrile

107-12-0

2404

10

4.50

Acrylonitrile

107-13-1

1093

10

9.10

Ethylenediamine

107-15-3

1604

10

9.10

Allyl alcohol

107-18-6

1098

10

6.80

Methyl chloromethyl ether (Chloromethyl methyl ether)

107-30-2

1339

10

2.27

Vinyl acetate

108-05-4

1301

10

6.80

Isopropyl chloroformate

108-23-6

2407

10

6.80

Cyclohexylamine

108-91-8

2357

10

6.80

Phenol

108-95-2

1671, 2312 & 2821

10

9.10

n-propyl chloroformate (Propyl chloroformate)

109-61-5

2740

10

6.80

Furan

110-00-9

2389

10

2.27

Piperidine

110-89-4

2401

10

6.80

trans-Crotonaldehyde

123-73-9

1143

10

9.10

Methylacrylonitrile

126-98-7

3079

10

4.50

Ethyleneimine

151-56-4

1185

10

4.50

Hydrazine

302-01-2

2029

10

6.80

Boron trifluoride dimethyl etherate

353-42-4

2965

10

6.80

Ketene

463-51-4

No number

1

0.22

Cyanogen bromide

506-68-3

1889

10

4.50

Cyanogen chloride

506-77-4

1589

10

4.50

Tetranitromethane

509-14-8

1510

10

4.50

Dichlorodimethyl ether [Bis(chloromethyl) ether]

542-88-1

2249

1

0.45

Methyl thiocyanate

556-64-9

No number

10

9.10

Toluene-2,4-diisocyanate

584-84-9

2078

10

4.50

Perchloromethyl mercaptan

594-42-3

1670

10

4.50

Methyl isocyanate

624-83-9

2480

10

4.50

Carbon monoxide

630-08-0

1016

10

6.80

Acryloyl chloride (acrylyl chloride)

814-68-6

No number

10

2.27

Sulphur hexafluoride (Sulfur hexafluoride)

2551-62-4

1080

10

9.10

Crotonaldehyde

4170-30-3

1143

10

9.10

Mercury

7439-97-6

2809

N/A

1.00

Sulphur dioxide

7446-09-5

1079

10

2.27

Sulphur trioxide

7446-11-9

1829

10

4.50

Titanium tetrachloride

7550-45-0

1838

10

1.13

Perchloryl fluoride (trioxychlorofluoride)

7616-94-6

3083

10

6.80

Boron trifluoride

7637-07-2

1008

10

2.27

Hydrochloric acid

7647-01-0

1789

30

6.80

Hydrogen chloride, anhydrous

7647-01-0

1789

10

2.27

Hydrofluoric acid

7664-39-3

1790

50

0.45

Hydrogen fluoride, anhydrous

7664-39-3

1052

1

0.45

Ammonia, anhydrous

7664-41-7

2073 & 2672

10

4.50

Ammonia solution

7664-41-7

2073 & 2672

20

9.10

Nitric acid

7697-37-2

2031 & 2032

80

6.80

Thionyl chloride

7719-09-7

1836

10

6.80

Phosphorus trichloride

7719-12-2

1809

10

6.80

Phosphorus, white

7723-14-0

2447

N/A

1.00

Bromine

7726-95-6

1744

10

4.50

Fluorine

7782-41-4

1045

1

0.45

Chlorine

7782-50-5

1017

10

1.13

Hydrogen sulphide

7783-06-4

1053

10

4.50

Hydrogen selenide

7783-07-5

2202

1

0.22

Sulphur tetrafluoride

7783-60-0

2418

10

1.13

Arsenic trichloride (arsenous trichloride)

7784-34-1

1560

10

6.80

Arsine

7784-42-1

2188

1

0.45

Chlorosulphonic acid

7790-94-5

1754

10

2.27

Phosphine

7803-51-2

2199

10

2.27

Stibine

7803-52-3

2676

10

2.27

Sulphuric acid, fuming (oleum)

8014-95-7

1831

N/A

4.50

Phosphorus oxychloride

10025-87-3

1810

10

2.27

Hydrogen bromide (Hydrobromic acid)

10035-10-6

1048 & 1788

10

1.13

Chlorine dioxide

10049-04-4

No number

1

0.45

Nitric oxide (nitrogen monoxide)

10102-43-9

1660

10

4.50

Nitrogen dioxide

10102-44-0

1067

10

1.13

Boron trichloride

10294-34-5

1741

10

2.27

Nickel carbonyl

13463-39-3

1259

1

0.45

Iron pentacarbonyl

13463-40-6

1994

10

1.13

Diborane

19287-45-7

1911

10

1.13

Osmium tetroxide

20816-12-0

2471

1

0.22

Toluene diisocyanate

26471-62-5

2078

10

4.50

Part 3 - Other hazardous substances

Name of the substance CAS registry number UN number (if applicable) Concentration (% mass/mass) Minimum quantity (tonnes)

Tetrachloromethane (carbon tetrachloride)

56-23-5

1846

10

0.22

Trichloroethylene (TCE)

79-01-6

1710

10

1.13

Naphthalene (liquid)

91-20-3

2304

10

4.50

3,3′-Dichlorobenzidine

91-94-1

No number

10

1.13

p-Nonylphenol

104-40-5

No number

10

1.13

Tetrachloroethylene (perchloroethylene)

127-18-4

1897

10

1.13

Nickel acetate

373-02-4

No number

10

0.22

Arsenic pentoxide

1303-28-2

1559

10

0.22

Cadmium oxide

1306-19-0

No number

10

0.22

Cadmium sulphide

1306-23-6

No number

10

0.22

Nickel oxide

1313-99-1

No number

10

0.22

Arsenic trioxide [arsenic(III) oxide]

1327-53-3

1561

10

0.22

Chromium trioxide

1333-82-0

1463 & 1755

10

0.22

Nickel carbonate

3333-67-3

 

10

0.22

Arsenic

7440-38-2

1558

10

0.22

Nickel chloride

7718-54-9

No number

10

0.22

Chromic acid

7738-94-5

1463 & 1755

10

0.22

Sodium chromate

7775-11-3

No number

10

0.22

Arsenic acid

7778-39-4

1553 & 1554

10

0.22

Sodium arsenate, dibasic

7778-43-0

1685

10

0.22

Sodium arsenite

7784-46-5

1686 & 2027

10

0.22

Nickel(II) sulphate [Nickel(II) sulfate]

7786-81-4

No number

10

0.22

Potassium chromate

7789-00-6

No number

10

0.22

Sodium arsenate, dibasic, heptahydrate

10048-95-0

1685

10

0.22

Nickel(II) sulphate, hexahydrate [Nickel(II) sulfate, hexahydrate]

10101-97

No number

10

0.22

Cadmium chloride

10108-64-2

No number

10

0.22

Cadmium sulphate

10124-36-4

No number

10

0.22

Sodium dichromate

10588-01-9

No number

10

0.22

Nickel nitrate [nickel(II) nitrate]

13138-45-9

2725

10

0.22

Nickel(II) nitrate, hexahydrate

13478-00-7

2725

10

0.22

Nickel ammonium sulphate (Nickel ammonium sulfate)

15699-18-0

No number

10

0.22

Nonylphenol (mixed isomer)

25154-52-3

No number

10

1.13

Tributyl tetradecyl phosphonium chloride (TTPC)

81741-28-8

No number

10

0.22

4-tert-Nonylphenol

84852-15-3

No number

10

1.13

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