Test methods pursuant to EC A.17. (Regulation (EC) No 440/2008 Annex “Part A: Methods for the determination of physicochemical properties, A.17 Oxidizing properties (solids)”

Oxidizing solids are solid substances or mixtures which, although not necessarily combustible themselves, may generally cause or support a fire in other materials by releasing oxygen.

This test is used to determine the oxidizing properties of solid substances and mixtures as a criterion for evaluation from a safety perspective or for classification in hazard classes and packing groups within the framework of relevant regulations, in particular pursuant to Regulation (EC) No 440/2008 Annex “Part A: Methods for the determination of physicochemical properties, A.17. Oxidizing properties (solids)”.

The test and reference substances are mixed in various weight ratios with a defined combustible substance (cellulose). Each mixture is then formed into a pile and these piles are ignited at one end. The maximum burning rate determined is compared with the maximum burning rate of the reference mixture.

A test substance is to be considered oxidizing if:

• in the preliminary test, there is a vigorous reaction;
• in the full test procedure, the maximum burning rate of the mixtures tested is higher than or equal to the maximum burning rate of the reference mixture of cellulose and barium nitrate.

Figure: Mould and accessories for the production of the pile from Regulation (EC) No 440-/2008 (page 121)