Division 1.10 Chemical Heat of CombustionF1

The chemical heat of combustion ΔH _c shall be either determined by:

1. (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

2. (b)

   applying the following calculation method:

The chemical heat of combustion (ΔH _c ), in kilojoules per gram (kJ/g), can be calculated as the product of the theoretical heat of combustion (ΔH _comb ), 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:

${\mathrm{\Delta Н}}_c=\sum _i^n\left[w_i\%\times {\mathrm{\Delta Н}}_{c\left(i\right)}\right]$

where:

ΔH _c

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

w _i %

mass fraction of component i in the product;

ΔH _c(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 an official Community language at the address specified on the label in accordance with point (a) of Article 8(1), if the chemical heat of combustion is used as a parameter for assessing the flammability of aerosols according to the provisions of this Directive.