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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 in the range 14.5 s - 43 s over 100 mm (highest burning rate: 6.9 mm/s). 
The substance as granulate (bulk density > 400 g/L) is non flammable: burning time 55-83 s over 100 mm.
The substance is non-pyrophoric. No flammable gases are liberated on contact with water.

Key value for chemical safety assessment

Additional information

In a number of tests performed with the substance according to either EU Method A.10 or UN Test N.1, 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.

In addition, in two studies it was demonstrated that the wetted zone did not stop the fire for > 4 min.

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 characterized by the bulk density < 400 g/L is considered to be a flammable solid, Category 1, because the burning rate exceeds the value of 2.2 mm/s, and the wetted zone does not stop the fire for 4 minutes. The substance in a form characterized by the bulk density > 400 g/L is non-flammable.

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