# The Pressure Equipment (Safety) Regulations 2016, Paragraph 7


For the purposes of the classification referred to in paragraph (5), fluids shall be divided up into the following groups—
(a) group 1 consisting of substances and mixtures, as defined in points 7 and 8 of Article 2 of Regulation (EC) 1272/2008 of the European Parliament and of the Council of 16th December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EEC, and amending Regulation (EC) No 1907/2006, that are classified as hazardous in accordance with the following physical or health hazard classes laid down in Parts 2 and 3 of Annex 1 to that Regulation—
(i) unstable explosives or explosives of Divisions 1.1. 1.2. 1.3, 1.4 and 1.5;
(ii) flammable gases, category 1 and 2;
(iii) oxidising gases, category 1;
(iv) flammable liquids, categories 1 and 2;
(v) flammable liquids, category 3 where the maximum allowable temperature is above the flashpoint;
(vi) flammable solids, category 1 and 2;
(vii) self-reactive substances and mixtures, type A to F;
(viii) pyrophoric liquids, category 1;
(ix) pyrophoric solids, category 1;
(x) oxidising liquids, category 1, 2 and 3;
(xi) substances and mixtures which in contact with water emit flammable gases, category 1, 2 and 3;
(xii) oxidising liquids, category 1, 2 and 3;
(xiii) oxidising solids, category 1, 2 and 3;
(xiv) organic peroxides types A to F;
(xv) acute oral toxicity, category 1 and 2;
(xvi) acute dermal toxicity, category 1, 2 and 3;
(xvii) acute inhalation toxicity, category 1, 2 and 3;
(xviii) specific target organ toxicity – single exposure, category 1;
Group 1 also comprises substances and mixtures contained in pressure equipment with a maximum allowable temperature TS which exceeds the flashpoint of the fluid;
(b) group 2 consisting of substances and mixtures not referred to in point (a).

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Source: https://www.legislation.gov.uk/uksi/2016/1105/schedule/3/paragraph/7 (the official version)
Page: https://openlegislation.uk/pressure-equipment-safety-regulations-2016/schedule-3/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.