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Physical & Chemical properties

Flammability

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Description of key information

flammable as dry pulverized substance (shortest burning time: 32 s, burning rate: 3.1 mm/s)
no pyrophoricity
no flammability on contact with water

Key value for chemical safety assessment

Additional information

The dried substance is flammable as determined in the test according to EU Method A.10., however the substance is marketed solely in the high water content states (paste or aqueous solution). According to 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 does not liberate flammable gases on contact with water as determined in the test according to EU Method A.12. Based on experience in handling and use and the chemical structure, flammability on contact with water is not to be expected.

Justification for classification or non-classification

According to Regulation (EC) No 1272/2008 on classification, labelling and packaging (CLP) of substances and mixtures, the dry substance, characterized by bulk density < 400 g/L, is considered to be a flammable solid, Category 1, and as R11 according to Directive 67/548/EEC. However, the substance is marketed only in the high water content states (paste or aqueous solution), and no risk of flammability is expected. Based on the experimental result, the substance is non-pyrophoric. Based on the chemical structure and experience in handling and use, flammability on contact with water is not expected.