Environmental emergencies: list of hazardous substances

This list of substances is divided into two 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 not solutions

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

Tetrachloromethane

56-23-5

1846

10

0.22

A

1,1-Dimethylhydrazine

57-14-7

1163

10

6.80

I

Ethyl ether

60-29-7

1155

1

4.50

E

Methylhydrazine

60-34-4

1244

10

6.80

I

Chloroform

67-66-3

1888

10

9.10

I

Benzene

71-43-2

1114

1

10

C

Methane

74-82-8

1971 & 1972

1

4.50

E

Methyl bromide

74-83-9

1062

10

2.27

I

Ethane

74-84-0

1035 & 1961

1

4.50

E

Ethylene

74-85-1

1038 & 1962

1

4.50

E

Acetylene

74-86-2

1001

1

4.50

E

Methyl chloride

74-87-3

1063

10

4.50

I

Methyl iodide

74-88-4

2644

10

4.50

I

Methylamine

74-89-5

1061

1

4.50

E

Hydrogen cyanide

74-90-8

1051, 1613 & 1614

10

1.13

I

Methyl mercaptan

74-93-1

1064

10

4.50

I

Propane

74-98-6

1978

1

4.50

E

Methylacetylene

74-99-7

1060

1

4.50

E

Ethyl chloride

75-00-3

1037

1

4.50

E

Vinyl chloride

75-01-4

1086

1

4.50

E

Vinyl fluoride

75-02-5

1860

1

4.50

E

Ethylamine

75-04-7

1036 & 2270

1

4.50

E

Acetaldehyde

75-07-0

1089

1

4.50

E

Ethyl mercaptan

75-08-1

2363

1

4.50

E

Dichloromethane

75-09-2

1593

1

9.10

I

Carbon disulfide

75-15-0

1131

10

9.10

I

Dimethyl sulfide

75-18-3

1164

1

150

C

Cyclopropane

75-19-4

1027

1

4.50

E

Ethylene oxide

75-21-8

1040

10

4.50

I

Isobutane

75-28-5

1969

1

4.50

E

2-Chloropropane

75-29-6

1027

1

4.50

E

Isopropylamine

75-31-0

1221

1

4.50

E

Vinylidene chloride

75-35-4

1303

1

4.50

E

1,1-Difluoroethane

75-37-6

1030

1

4.50

E

1,1-Difluoroethylene

75-38-7

1959

1

4.50

E

Phosgene

75-44-5

1076

1

0.22

I

Trimethylamine

75-50-3

1083 & 1297

1

4.50

E

Propyleneimine

75-55-8

1921

10

4.50

I

Methyloxirane

75-56-9

1280

10

4.50

I

tert-Butylamine

75-64-9

1125

1

150

C

Tetramethyl lead

75-74-1

No number

10

4.50

I

Tetramethylsilane

75-76-3

2749

1

4.50

E

Trimethylchlorosilane

75-77-4

1298

10

4.50

I

Dimethyldichlorosilane

75-78-5

1162

10

2.27

I

Methyltrichlorosilane

75-79-6

1250

10

2.27

I

Trichloronitromethane

76-06-2

1580

10

2.27

I

Tetraethyl lead

78-00-2

1649

10

2.27

I

2-Methylbutane

78-78-4

1265

1

4.50

E

1,3-Butadiene, 2-methyl-

78-79-5

1218

1

4.50

E

Isobutyronitrile

78-82-0

2284

10

9.10

I

Trichloroethylene

79-01-6

1710

10

1.13

A

2-Propenamide

79-06-1

2074 & 3426

10

9.10

A

Methyl chloroformate

79-22-1

1238

10

2.27

I

Trifluorochloroethylene

79-38-9

1082

1

4.50

E

Phenol, 4,4′-(1-methylethylidene)bis-

80-05-7

No number

10

4.50

A

Toluene-2,6-diisocyanate

91-08-7

2078

10

4.50

I

Naphthalene

91-20-3

2304

10

4.50

A

3,3′-Dichlorobenzidine

91-94-1

No number

10

1.13

A

Ethylbenzene

100-41-4

1175

1

7000

C

Styrene

100-42-5

2055

10

4.50

E

Benzene, (chloromethyl)-

100-44-7

1738

10

4.50

A

p-Nonylphenol

104-40-5

No number

10

1.13

A

Oxirane, (chloromethyl)-

106-89-8

2023

10

9.10

I

Butane

106-97-8

1011

1

4.50

E

1-Butene

106-98-9

1012

1

4.50

E

1,3-Butadiene

106-99-0

1010

1

4.50

E

Ethylacetylene

107-00-6

2452

1

4.50

E

2-Butene

107-01-7

1055

1

4.50

E

Acrolein

107-02-8

1092

10

2.27

I

Allyl chloride

107-05-1

1100

10

9.10

I

1,2-Dichloroethane

107-06-2

1184

10

6.80

I

2-Chloroethanol

107-07-3

1135

10

4.50

I

Allylamine

107-11-9

2334

10

4.50

I

Propionitrile

107-12-0

2404

10

4.50

I

Acrylonitrile

107-13-1

1093

10

9.10

I

Ethylenediamine

107-15-3

1604

10

9.10

I

Allyl alcohol

107-18-6

1098

10

6.80

I

Vinyl methyl ether

107-25-5

1087

1

4.50

E

Chloromethyl methyl ether

107-30-2

1339

10

2.27

I

Methyl formate

107-31-3

1243

1

4.50

E

Vinyl acetate

108-05-4

1301

10

6.80

I

Isopropyl chloroformate

108-23-6

2407

10

6.80

I

Toluene

108-88-3

1294

1

2500

C

Cyclohexylamine

108-91-8

2357

10

6.80

I

Phenol

108-95-2

1671, 2312 & 2821

10

9.10

I

Propyl chloroformate

109-61-5

2740

10

6.80

I

Pentane

109-66-0

1265

1

4.50

E

1-Pentene

109-67-1

1108

1

4.50

E

Vinyl ethyl ether

109-92-2

1302

1

4.50

E

Ethyl nitrite

109-95-5

1194

1

4.50

E

Furan

110-00-9

2389

10

2.27

I

Ethanol, 2-methoxy-, acetate

110-49-6

1189

10

9.10

A

Hexane

110-54-3

1208

10

4.50

A

Cyclohexane

110-82-7

1145

1

550

C

Piperidine

110-89-4

2401

10

6.80

I

Ethanol, 2-ethoxy-, acetate

111-15-9

1172

10

9.10

A

Propylene

115-07-1

1077

1

4.50

E

Dimethyl ether

115-10-6

1033

1

4.50

E

2-Methylpropene

115-11-7

1055

1

4.50

E

Tetrafluoroethylene

116-14-3

1081

1

4.50

E

1,2-Benzenediol

120-80-9

2811

10

4.50

A

1,4-Benzenediol

123-31-9

2662

10

0.22

A

Crotonaldehyde, (E)-

123-73-9

1143

10

9.10

I

1,4-Dioxane

123-91-1

1165

1

9.10

I

Dimethylamine

124-40-3

1032 & 1160

1

4.50

E

Phosphoric acid, tributyl ester

126-73-8

2810

10

4.50

A

Methylacrylonitrile

126-98-7

3079

10

4.50

I

Tetrachloroethylene

127-18-4

1897

10

1.13

A

Ethyleneimine

151-56-4

1185

10

4.50

I

Hydrazine

302-01-2

2029

10

6.80

I

Boron trifluoride dimethyl etherate

353-42-4

2965

10

6.80

I

Nickel acetate

373-02-4

No number

10

0.22

A

Cyanogen

460-19-5

1026

1

4.50

E

Propadiene

463-49-0

2200

1

4.50

E

Ketene

463-51-4

No number

1

0.22

I

Carbonyl sulfide

463-58-1

2204

1

4.50

E

2,2-Dimethylpropane

463-82-1

2044

1

4.50

E

1,3-Pentadiene

504-60-9

No number

1

4.50

E

Cyanogen bromide

506-68-3

1889

10

4.50

I

Cyanogen chloride

506-77-4

1589

10

4.50

I

Tetranitromethane

509-14-8

1510

10

4.50

I

Bis(chloromethyl) ether

542-88-1

2249

1

0.45

I

Methyl thiocyanate

556-64-9

No number

10

9.10

I

2-Chloropropene

557-98-2

2456

1

4.50

E

3-Methyl-1-butene

563-45-1

2561

1

4.50

E

2-Methyl-1-butene

563-46-2

2459

1

4.50

E

Toluene-2,4-diisocyanate

584-84-9

2078

10

4.50

I

2-Butene, (Z)-

590-18-1

1055

1

4.50

E

1-Chloropropene

590-21-6

No number

1

4.50

E

Perchloromethyl mercaptan

594-42-3

1670

10

4.50

I

Bromotrifluoroethylene

598-73-2

2419

1

4.50

E

2-Butene, (E)-

624-64-6

1055

1

4.50

E

Methyl isocyanate

624-83-9

2480

10

4.50

I

2-Pentene, (Z)-

627-20-3

No number

1

4.50

E

Carbon monoxide

630-08-0

1016

10

6.80

I

2-Pentene, (E)-

646-04-8

No number

1

4.50

E

1-Buten-3-yne

689-97-4

No number

1

4.50

E

Phenol, 2,4,6-tris(1,1-dimethylethyl)-

732-26-3

No number

10

0.22

A

Acryloyl chloride

814-68-6

No number

10

2.27

I

Arsenic pentoxide

1303-28-2

1559

10

0.22

A

Cadmium oxide

1306-19-0

No number

10

0.22

A

Cadmium sulfide

1306-23-6

No number

10

0.22

A

Nickel oxide

1313-99-1

No number

10

0.22

A

Vanadium pentoxide

1314-62-1

2862

10

0.22

A

Arsenic trioxide

1327-53-3

1561

10

0.22

A

Xylenes

1330-20-7

1307

1

8000

C

Hydrogen

1333-74-0

1966

1

4.50

E

Chromium trioxide

1333-82-0

1463 & 1755

10

0.22

A

Sulfur hexafluoride

2551-62-4

1080

10

9.10

I

Dichlorosilane

4109-96-0

2189

1

4.50

E

Crotonaldehyde

4170-30-3

1143

10

9.10

I

Ammonium nitrate, solid

6484-52-2

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

60

20

O

Mercury

7439-97-6

2809

N/A

1.00

I

Arsenic

7440-38-2

1558

10

0.22

A

Sulfur dioxide

7446-09-5

1079

10

2.27

I

Sulfur trioxide

7446-11-9

1829

10

4.50

I

Titanium tetrachloride

7550-45-0

1838

10

1.13

I

Perchloryl fluoride

7616-94-6

3083

10

6.80

I

Boron trifluoride

7637-07-2

1008

10

2.27

I

Cobalt chloride

7646-79-9

3288

10

0.22

A

Hydrogen chloride, anhydrous

7647-01-0

1789

10

2.27

I

Hydrogen fluoride, anhydrous

7664-39-3

1052

1

0.45

I

Ammonia, anhydrous

7664-41-7

2073 & 2672

10

4.50

I

Nickel chloride

7718-54-9

No number

10

0.22

A

Thionyl chloride

7719-09-7

1836

10

6.80

I

Phosphorus trichloride

7719-12-2

1809

10

6.80

I

Phosphorus

7723-14-0

2447

N/A

1.00

I

Bromine

7726-95-6

1744

10

4.50

I

Sodium chlorate

7775-09-9

1495

10

10

O

Sodium chromate

7775-11-3

No number

10

0.22

A

Sodium arsenate, dibasic

7778-43-0

1685

10

0.22

A

Fluorine

7782-41-4

1045

1

0.45

I

Chlorine

7782-50-5

1017

10

1.13

I

Hydrogen sulfide

7783-06-4

1053

10

4.50

I

Hydrogen selenide

7783-07-5

2202

1

0.22

I

Sulfur tetrafluoride

7783-60-0

2418

10

1.13

I

Arsenous trichloride

7784-34-1

1560

10

6.80

I

Arsine

7784-42-1

2188

1

0.45

I

Sodium arsenite

7784-46-5

1686 & 2027

10

0.22

A

Nickel(II) sulfate

7786-81-4

No number

10

0.22

A

Potassium chromate

7789-00-6

No number

10

0.22

A

Ammonium perchlorate

7790-98-9

1442

1

3.40

O

Dichlorine oxide

7791-21-1

No number

1

4.50

E

Phosphine

7803-51-2

2199

10

2.27

I

Stibine

7803-52-3

2676

10

2.27

I

Silane

7803-62-5

2203

1

4.50

E

Petroleum crude oil

8002-05-9

1267

1

2500

F

Liquefied natural gas

8006-14-2

1972

1

4.50

E

Unleaded gasoline

8006-61-9

1203

1

150

C

Sulfuric acid, fuming

8014-95-7

1831

N/A

4.50

I

Naphtha

8030-30-6

1268

1

50

C

Trichlorosilane

10025-78-2

1295

1

4.50

E

Phosphorus oxychloride

10025-87-3

1810

10

2.27

I

Hydrogen bromide

10035-10-6

1048 & 1788

10

1.13

I

Sodium arsenate, dibasic, heptahydrate

10048-95-0

1685

10

0.22

A

Chlorine dioxide

10049-04-4

No number

1

0.45

I

Nickel(II) sulfate, hexahydrate

10101-97

No number

10

0.22

A

Nitric oxide

10102-43-9

1660

10

4.50

I

Nitrogen dioxide

10102-44-0

1067

10

1.13

I

Cadmium chloride

10108-64-2

No number

10

0.22

A

Cadmium sulfate

10124-36-4

No number

10

0.22

A

Boron trichloride

10294-34-5

1741

10

2.27

I

Sodium dichromate

10588-01-9

No number

10

0.22

A

Nickel nitrate

13138-45-9

2725

10

0.22

A

Nickel carbonyl

13463-39-3

1259

1

0.45

I

Iron pentacarbonyl

13463-40-6

1994

10

1.13

I

Nickel(II) nitrate, hexahydrate

13478-00-7

2725

10

0.22

A

Nickel ammonium sulfate

15699-18-0

No number

10

0.22

A

Phenol, 2,6-bis(1,1-dimethylethyl)-4-(1-methylpropyl)-

17540-75-9

No number

10

0.22

A

Diborane

19287-45-7

1911

10

1.13

I

Osmium tetroxide

20816-12-0

2471

1

0.22

I

Nonylphenol

25154-52-3

No number

10

1.13

A

Butene

25167-67-3

1012

1

4.50

E

Toluene diisocyanate

26471-62-5

2078

10

4.50

I

Decanedioic acid, bis(1,2,2,6,6-pentamethyl-4-piperidinyl) ester

41556-26-7

No number

10

1.13

A

Natural gas condensates, petroleum

64741-47-5

1268

1

340

C

Natural gas, petroleum, raw liquid mix

64741-48-6

1268

1

4.50

E

Distillates, petroleum, sweetened middle

64741-86-2

1268

1

2500

F

Naphtha, petroleum, sweetened

64741-87-3

1268

1

4.50

E

Distillates, petroleum, hydrodesulfurized middle

64742-80-9

1268

1

2500

F

Fuels, diesel

68334-30-5

1202

1

2500

F

Fuel oil, No. 2

68476-30-2

1202

1

2500

F

Fuel oil, No. 4

68476-31-3

1202

1

2500

F

Fuel oil, residual

68476-33-5

1202

1

2500

F

Fuels, diesel, No. 2

68476-34-6

1202

1

2500

F

Naphtha, petroleum, full-range alkylate, butane-containing

68527-27-5

1268

1

80

C

Fuel oil, No. 6

68553-00-4

1202

1

2500

F

Natural gas condensates

68919-39-1

1268

1

45

C

Methylium, [4-(dimethylamino)phenyl]bis[4-(ethylamino)-3-methylphenyl]-, acetate

72102-55-7

No number

10

0.22

A

Tributyl tetradecyl phosphonium chloride

81741-28-8

No number

10

0.22

A

4-Nonylphenol, branched

84852-15-3

No number

10

1.13

A

Gasoline (motor fuel)

86290-81-5

1203

1

150

C

Distillates, petroleum, hydrodesulfurized full-range middle

101316-57-8

1268

1

2500

F

Crude oil, oil sand

128683-25-0

1267

1

2500

F

Part 2 - Substances that are solutions

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

Formaldehyde, solution

50-00-0

1198 & 2209

10

6.80

I

Acetic acid

64-19-7

2789 & 2790

95

6.80

I

Hydrocyanic acid

74-90-8

1051, 1613 & 1614

10

1.13

I

Peracetic acid

79-21-0

3107

10

4.50

I

Ammonium hydroxide

1336-21-6

2672, 2073 & 3318

20

9.10

I

Ammonium nitrate, solution

6484-52-2

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

81

20

O

Hydrochloric acid

7647-01-0

1789

30

6.80

I

Hydrofluoric acid

7664-39-3

1790

50

0.45

I

Ammonia solution

7664-41-7

2073 & 2672

20

9.10

I

Nitric acid

7697-37-2

2031 & 2032

80

6.80

I

Hydrogen peroxide

7722-84-1

2015

52

3.40

O

Chromic acid

7738-94-5

1463 & 1755

10

0.22

A

Arsenic acid

7778-39-4

1553 & 1554

10

0.22

A

Chlorosulfuric acid

7790-94-5

1754

10

2.27

I

Hydrobromic acid

10035-10-6

1048 & 1788

10

1.13

I

Legend:

A = aquatically toxic

C = combustible

E = likely to explode

F = pool fire hazard

I = inhalation hazard

O = oxidizer that may explode

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