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Physical & Chemical properties

Flammability

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Description of key information

Highly flammable (test results, EU A.10 and ADR 2.2.41.1.8 methods)- equivalent to Cat. 1 Flam. Solid (H228) under CLP.

In the test according to ADR, the burning was not stopped by a moistened zone. The burning rate was between 2.4 and 3 mm/s.

Key value for chemical safety assessment

Flammability:
flammable

Additional information

Justification for classification or non-classification

Classified as highly flammable, based on test results (EU A.10 and ADR 2.2.41.1.8 methods). In the test according to ADR, the burning was not stopped by a moistened zone. The burning rate was between 2.4 and 3 mm/s. In accordance with the classification criteria laid down in regulation (EC) No 1272/2008, dibasic lead phosphite required classification as a flammable solid category 1. Note that this is a self-classification which is in addition to the existing EU harmonised classification (which is based on a group entry). The studies considered for this self-classification of dibasic lead phosphite were not yet available at the time of adoption of the EU harmonised classification.

Whereas the need for classification is given based on "flammability in contact with a flame" (A.10 study), dibasic lead phosphite 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 dibasic lead phosphite.

Dibasic lead phosphite also 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.