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Physical & Chemical properties

Flammability

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Description of key information

Waiving for pyrophoricity, flammability solids and flammability in contact with water.

Key value for chemical safety assessment

Flammability:
not classified

Additional information

Justification for classification or non-classification

No classification required.

Tribasic lead sulphate does not exhibit pyrophoric properties. In several decades of production, marketing and downstream use, none of the lead compounds have ever been reported to exhibit such properties. Furthermore, based upon a statement on the pyrophoric properties of the European Lead Stabiliser Association (ELSA, 2004), experimental handling over the last 50 years revealed no such properties for tribasic lead sulphate.

It does not contain groups that might lead to a reaction with water or damp air, leading to the development of dangerous amounts of gas or gases which may be highly flammable. Furthermore, experience in practical handling of the substance shows that it does not react with water, and recent experimental testing for water solubility has not reported formation of any gas or gases whatsoever in any of the lead compounds.

Testing of flammability was recently conducted for lead metal powder, yielding a result of “not flammable”. Since tribasic lead sulphate represents an inorganic salt containing lead in an oxidised status (2+) and an anion of an inorganic acid which is not susceptible to any form of oxidation, the substance is thus intrinsically less combustible than lead itself, and a test conducted according to the same method can not reasonably be expected to yield any other results.