# 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 2.3.4.1: The chemical heat of combustion (ΔΗ c ), in kilojoules per gram (kJ/g), is the product of the theoretical heat of combustion (ΔΗ comb ), and a combustion efficiency, usually less than 1,0 (a typical combustion efficiency is 0,95 or 95 %).

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

For a composite aerosol formulation, the chemical heat of combustion is the summation of the weighted heats of combustion for the individual components, as follows:
ΔH c product = ∑ i n w i % × ΔH c i
where:
ΔΗ c chemical heat of combustion (kJ/g);
w i % mass fraction of component i in the product;
ΔΗ c(i) specific heat of combustion (kJ/g)of component i in the product.
The chemical heats of combustion can be found in the literature, calculated or determined by tests (see ASTM D 240 as amended — Standard Test Methods for Heat of Combustion of Liquid Hydrocarbon Fuels by Bomb Calorimeter, EN/ISO 13943 as amended, 86.l to 86.3 — Fire safety — Vocabulary, and NFPA 30B as amended — Code for the Manufacture and Storage of Aerosol Products).

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Source: https://www.legislation.gov.uk/eur/2008/1272/annex/I/division/2/division/2.3/division/2.3.4/division/2.3.4.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2008-1272/annex-I/division-2/division-2.3/division-2.3.4/division-2.3.4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.