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Physical & Chemical properties

Flammability

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Description of key information

The substance as powder (bulk density < 400 g/L) is flammable with a burning time 31 s over 100 mm (burning rate: 3.2 mm/s) (EU A.10)
The substance as granulate (bulk density > 400 g/L) is non flammable: burning rate 1.9 mm/s (VDI 2263)
The substance is non-pyrophoric. No flammable gases are liberated on contact with water.

Key value for chemical safety assessment

Additional information

In two tests performed with the substance according to EU Method A.10, or VDI 2263, a clear dependence on the aggregate state was indicated. According to these data, as well as the manufacturer's experience, and available experimental evidence on a variety of alkyl sulfates, solid forms of bulk density < 400 g/L are flammable on ignition, whereas solid forms of higher bulk density > 400 g/L are non-flammable. In terms of aggregate state, this corresponds approximately to powders and granulates, respectively.

The substance has no pyrophoric properties and does not liberate flammable gases on contact with water.

Justification for classification or non-classification

According to Regulation (EC) No 1272/2008 on classification, labelling and packaging (CLP) of substances and mixtures, the substance is considered to be a flammable solid, Category 1, and as R11 according to Directive 67/548/EEC, if in powder form (bulk density < 400 g/L).

According to the experience in handling and use and molecular structure, the substance has no pyrophoric properties and does not liberate flammable gases on contact with water.