# The Control of Major Accident Hazards Regulations 2015, Part 1: Categories of Dangerous Substances


Column 1
Column 2
Column 3
Hazard categories in accordance with the CLP Regulation
Qualifying quantity in tonnes of dangerous substances for the application of:
Lower tier requirements
Upper tier requirements
Section ‘H’ – HEALTH HAZARDS
H1 ACUTE TOXIC Category 1, all exposure routes
5
20
H2 ACUTE TOXIC
— Category 2, all exposure routes
— Category 3, inhalation exposure route (see note 7)
50
200
H3 STOT SPECIFIC TARGET ORGAN TOXICITY – SINGLE EXPOSURE STOT SE Category 1
50
200
Section ‘P’ – PHYSICAL HAZARDS
P1a EXPLOSIVES (see note 8)
— Unstable explosives or
— Explosives, Division 1.1, 1.2, 1.3, 1.5 or 1.6, or — Substances or mixtures which have explosive properties according to method A.14 of Regulation (EC) No. 440/2008 of 30 May 2008 laying down test methods pursuant to Regulation (EC) No. 1907/2006 of the European Parliament and of the Council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) (see note 9) and do not belong to the hazard classes Organic peroxides or Self-reactive substances and mixtures
10
50
P1b EXPLOSIVES (see note 8)
Explosives, Division 1.4 (see note 10)
50
200
P2 FLAMMABLE GASES
Flammable gases, Category 1 or 2
10
50
P3a FLAMMABLE AEROSOLS (see note 11(1))
‘Flammable’ aerosols Category 1 or 2, containing flammable gases Category 1 or 2 or flammable liquids Category 1
150 (net)
500 (net)
P3b FLAMMABLE AEROSOLS (see note 11(1))
‘Flammable’ aerosols Category 1 or 2, not containing flammable gases Category 1 or 2 nor flammable liquids category 1 (see note 11(2))
5,000 (net)
50,000 (net)
P4 OXIDISING GASES
Oxidising gases, Category 1
50
200
P5a FLAMMABLE LIQUIDS
— Flammable liquids, Category 1, or
— Flammable liquids Category 2 or 3 maintained at a temperature above their boiling point, or
— Other liquids with a flash point ≤ 60°C, maintained at a temperature above their boiling point (see note 12)
10
50
P5b FLAMMABLE LIQUIDS
— Flammable liquids Category 2 or 3 where particular processing conditions, such as high pressure or high temperature, may create major accident hazards, or
— Other liquids with a flash point ≤ 60°C where particular processing conditions, such as high pressure or high temperature, may create major accident hazards (see note 12)
50
200
P5c FLAMMABLE LIQUIDS
Flammable liquids, Categories 2 or 3 not covered by P5a and P5b
5,000
50,000
P6a SELF-REACTIVE SUBSTANCES AND MIXTURES and ORGANIC PEROXIDES
Self-reactive substances and mixtures, Type A or B or organic peroxides, Type A or B
10
50
P6b SELF-REACTIVE SUBSTANCES AND MIXTURES and ORGANIC PEROXIDES
Self-reactive substances and mixtures, Type C, D, E or F or organic peroxides, Type C, D, E, or F
50
200
P7 PYROPHORIC LIQUIDS AND SOLIDS
Pyrophoric liquids, Category 1
Pyrophoric solids, Category 1
50
200
P8 OXIDISING LIQUIDS AND SOLIDS
Oxidising Liquids, Category 1, 2 or 3, or
Oxidising Solids, Category 1, 2 or 3
50
200
Section ‘E’ – ENVIRONMENTAL HAZARDS
E1 Hazardous to the Aquatic Environment in Category Acute 1 or Chronic 1
100
200
E2 Hazardous to the Aquatic Environment in Category Chronic 2
200
500
Section ‘O’ – OTHER HAZARDS
O1 Substances or mixtures with hazard statement EUH014
100
500
O2 Substances and mixtures which in contact with water emit flammable gases, Category 1
100
500
O3 Substances or mixtures with hazard statement EUH029
50
200

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