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Physical & Chemical properties

Flammability

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Description of key information

Waiving for flammability in contact with water and pyrophoricity; read-across used for flammable solids, from lead metal powder (testing according to EU Method A.10).

Key value for chemical safety assessment

Flammability:
not classified

Additional information

Justification for classification or non-classification

No classification required.

Flammable solids - read-across: the source substance, lead metal powder, could not be ignited with a flame and was thus deemed "not classified" under Regulation 1272/2008. Since lead oxide sulfate represents a further oxidised form of lead and is thus intrinsically less combustible than lead itself, a test conducted according to the same method can not reasonably be expected to yield any result other than "not flammable". Testing of lead oxide sulfate is not required in accordance with REACH Annex XI, Section 1.5 (read-across). Furthermore, during several decades of manufacture, marketing and downstream use, the substance has never been reported to exhibit flammability.

Pyrophoricity - waiver: Lead oxide sulfate does not contain any components that might lead to spontaneous ignition a short time after coming in contact with air at room temperature (circa 20°C). It represents a further oxidised form of lead and is thus intrinsically less combustible than lead itself, which is deemed non-pyrophoric. Furthermore, despite several decades of industrial handling, the substance has never been reported to exhibit pyrophoric properties.

Flammability in contact with water - waiver: Lead oxide sulfate 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 experimental testing for water solubility has not reported formation of any gas.