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The Aerosol Dispensers Regulations 2009

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[F1Chemical Heat of CombustionE+W+S

This section has no associated Explanatory Memorandum

1.10.  The chemical heat of combustion ΔHc shall be either determined by:

(a)acknowledged rules of technology, described e.g. in standards such as ASTM D 240, ISO 13943 86.1 to 86.3 and NFPA 30B, or found in the scientifically established literature; or

(b)applying the following calculation method:

The chemical heat of combustion (ΔHc), in kilojoules per gram (kJ/g), can be calculated as the product of the theoretical heat of combustion (ΔHcomb), and a combustion efficiency, usually less than 1,0 (a typical combustion efficiency is 0,95 or 95%).

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:

where:

  • ΔHc = chemical heat of combustion (kJ/g) of the product;

  • wi% = mass fraction of component i in the product;

  • ΔHc(i) = specific heat of combustion (kJ/g) of component i in the product.

The person responsible for the marketing of the aerosol dispenser has to describe the method used for determining the chemical heat of combustion in a document to be made readily available in English at the address specified on the label in accordance with regulation 3(8)(a)(i), if the chemical heat of combustion is used as a parameter for assessing the flammability of aerosols, according to the provisions of these Regulations.]

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