# Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006 (Text with EEA relevance), Division 2.2.2.1: A flammable gas is classified in Category 1A, 1B or 2 in accordance with Table 2.2.1. Flammable gases that are pyrophoric and/or chemically unstable are always classified in Category 1A.

Extent: E+W+S+N.I.

Table 2.2.1
Criteria for categorisation of flammable gases
Category
Criteria
1A
Flammable gas
Gases, which at 20 °C and a standard pressure of 101,3 kPa are:
(a)ignitable when in a mixture of 13 % or less by volume in air; or
(b)have a flammable range with air of at least 12 percentage points regardless of the lower flammability limit
unless data show they meet the criteria for Category 1B
Pyrophoric gas
Flammable gases that ignite spontaneously in air at a temperature of 54 °C or below
Chemically unstable gas
A
Flammable gases which are chemically unstable at 20 °C and a standard pressure of 101,3 kPa
B
Flammable gases which are chemically unstable at a temperature greater than 20 °C and/or a pressure greater than 101,3 kPa
1B
Flammable gas
Gases which meet the flammability criteria for Category 1A, but which are not pyrophoric, nor chemically unstable, and which have at least either:
(a)a lower flammability limit of more than 6 % by volume in air; or
(b)a fundamental burning velocity of less than 10 cm/s;
2
Flammable gas
Gases, other than those of Category 1A or 1B, which, at 20 °C and a standard pressure of 101,3 kPa, have a flammable range while mixed in air.
NOTE 1: Aerosols shall not be classified as flammable gases. See Section 2.3.
NOTE 2: In the absence of data allowing classification into Category 1B, a flammable gas that meets the criteria for Category 1A is classified by default in Category 1A.
NOTE 3: Spontaneous ignition for pyrophoric gases is not always immediate, and there may be a delay.
NOTE 4: In the absence of data on its pyrophoricity, a flammable gas mixture shall be classified as a pyrophoric gas if it contains more than 1 % (by volume) of pyrophoric component(s).

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Source: https://www.legislation.gov.uk/eur/2008/1272/annex/I/division/2/division/2.2/division/2.2.2/division/2.2.2.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2008-1272/annex-I/division-2/division-2.2/division-2.2.2/division-2.2.2.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.