# The Control of Major Accident Hazards Regulations 2015, Part 2: Named Dangerous Substances


Column 1
CAS number (see note 22)
Column 2
Column 3
Qualifying quantity in tonnes of dangerous substances for the application of:
Dangerous substances
Lower tier requirements
Upper tier requirements
1. Ammonium nitrate (see note 13)
-
5,000
10,000
2. Ammonium nitrate (see note 14)
-
1,250
5,000
3. Ammonium nitrate (see note 15)
-
350
2,500
4. Ammonium nitrate (see note 16)
-
10
50
5. Potassium nitrate (see note 17)
-
5,000
10,000
6. Potassium nitrate (see note 18)
-
1,250
5,000
7. Arsenic pentoxide, arsenic (V) acid and/or salts
1303-28-2
1
2
8. Arsenic trioxide, arsenious (III) acid and/or salts
1327-53-3
0.1
9. Bromine
7726-95-6
20
100
10. Chlorine
7782-50-5
10
25
11. Nickel compounds in inhalable powder form: nickel monoxide, nickel dioxide, nickel sulphide, trinickel disulphide, dinickel trioxide
-
1
12. Ethyleneimine
151-56-4
10
20
13. Fluorine
7782-41-4
10
20
14. Formaldehyde (concentration ≥ 90 %)
50-00-0
5
50
15. Hydrogen
1333-74-0
5
50
16. Hydrogen chloride (liquefied gas)
7647-01-0
25
250
17. Lead alkyls
-
5
50
18. Liquefied flammable gases, Category 1 or 2 (including LPG) and natural gas (see note 19)
-
50
200
19. Acetylene
74-86-2
5
50
20. Ethylene oxide
75-21-8
5
50
21. Propylene oxide
75-56-9
5
50
22. Methanol
67-56-1
500
5,000
23. 4, 4′-Methylene bis (2-chloraniline) and/or salts, in powder form
101-14-4
0.01
24. Methylisocyanate
624-83-9
0.15
25. Oxygen
7782-44-7
200
2,000
26. 2,4 -Toluene diisocyanate
2,6 -Toluene diisocyanate
584-84-9
91-08-7
10
100
27. Carbonyl dichloride (phosgene)
75-44-5
0.3
0.75
28. Arsine (arsenic trihydride)
7784-42-1
0.2
1
29. Phosphine (phosphorus trihydride)
7803-51-2
0.2
1
30. Sulphur dichloride
10545-99-0
1
31. Sulphur trioxide
7446-11-9
15
75
32. Polychlorodibenzofurans and polychlorodibenzodioxins (including TCDD), calculated in TCDD equivalent (see note 20)
-
0.001
33. The following CARCINOGENS or the mixtures containing the following carcinogens at concentrations above 5% by weight: 4-Aminobiphenyl and/or its salts, Benzotrichloride, Benzidine and/or salts, Bis (chloromethyl) ether, Chloromethyl methyl ether, 1,2-Dibromoethane, Diethyl sulphate, Dimethyl sulphate, Dimethylcarbamoyl chloride, 1,2-Dibromo-3-chloropropane, 1,2-Dimethylhydrazine, Dimethylnitrosamine, Hexamethylphosphoric triamide, Hydrazine, 2- Naphthylamine and/or salts, 4-Nitrodiphenyl, and 1,3 Propanesultone
-
0.5
2
34. Petroleum products and alternative fuels
(a) gasolines and naphthas,
(b) kerosenes (including jet fuels),
(c) gas oils (including diesel fuels, home heating oils and gas oil blending streams),
(d) heavy fuel oils,
(e) alternative fuels serving the same purposes and with similar properties as regards flammability and environmental hazards as the products referred to in points (a) to (d)
-
2,500
25,000
35. Anhydrous ammonia
7664-41-7
50
200
36. Boron trifluoride
7637-07-2
5
20
37. Hydrogen sulphide
7783-06-4
5
20
38. Piperidine
110-89-4
50
200
39. Bis(2-dimethylaminoethyl) (methyl)amine
3030-47-5
50
200
40. 3-(2-Ethylhexyloxy)propylamine
5397-31-9
50
200
41. Mixtures of sodium hypochlorite classified as Aquatic Acute Category 1 [H400] containing less than 5% active chlorine and not classified under any of the other hazard categories in Part 1 of this Schedule, provided that the mixture in the absence of sodium hypochlorite would not be classified as Aquatic Acute Category 1 [H400].
-
200
500
42. Propylamine (see note 21)
107-10-8
500
2,000
43. Tert-butyl acrylate (see note 21)
1663-39-4
200
500
44. 2-Methyl-3-butenenitrile (see note 21)
16529-56-9
500
2,000
45. Tetrahydro-3,5-dimethyl-1,3,5-thiadiazine-2-thione (Dazomet) (see note 21)
533-74-4
100
200
46. Methyl acrylate (see note 21)
96-33-3
500
2,000
47. 3-Methylpyridine (see note 21)
108-99-6
500
2,000
48. 1-Bromo-3-chloropropane (see note 21)
109-70-6
500
2,000

---
Source: https://www.legislation.gov.uk/uksi/2015/483/schedule/1/part/2 (the official version)
Page: https://openlegislation.uk/control-of-major-accident-hazards-regulations-2015/schedule-1/part-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.