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Physical & Chemical properties

Oxidising properties

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Description of key information

Read-across from lead tetroxide:

The read-across approach used falls under RAAF Scenario 2: analogue approach for which the hypothesis is based on different compounds with the same type of effect.

The absence of effects obtained in a study conducted with the source substance, lead tetroxide, is used to predict the same absence of effects that would be observed in a study with the target substance if it were to be conducted.

Key value for chemical safety assessment

Oxidising properties:
non oxidising

Additional information

On the basis of read-across from lead tetroxide, together with long-term industrial handling experience, testing of lead oxide sulfate is not required, in accordance with Regulation (EC) No 1907/2006, Annex XI, Section 1.5: read-across of results and conclusion on classification for lead tetroxide to lead oxide sulfate is justifiable, under RAAF scenario 2.

Justification for classification or non-classification

Lead oxide sulfate does not require classification for oxidising properties based on a comparison of the intrinsic chemistry of the substance compared to a tested substance, orange lead, which was concluded "non oxidising". This "non oxidising" conclusion for lead oxide sulfate is is also supported by long-term industrial handling experience of the substance.

In the sense of classification for supply and transport an oxidising solid is a solid which, while in itself not necessarily combustible, may - generally by yielding oxygen - cause or contribute to the combustion of other material. An oxidising agent is therefore normally found in one of its higher possible oxidation states.

A test according to EU Method A.17 was carried out on lead tetroxide (orange lead; Pb3O4) in 2005. From the test results it was concluded that orange lead does not exhibit oxidising properties.

In the test substance, the lead is present in two oxidation states +II and +IV. However, the lead in lead oxide sulfate is only in the oxidation state +II and is thus intrinsically less oxidising. Lead oxide sulfate also contains sulfur in the form of the sulfate ion, which is known to be only very weak as an oxidising agent, owing to the stability of the sulfur-oxygen bonds and the stability of the sulfate entity.

Based on the intrinsic chemistry of the substance and compared to the tested substance, lead tetroxide, it appears scientifically implausible that lead oxide sulfate would exhibit oxidising properties which would be sufficient for classification.

Furthermore, no oxidising properties have been observed throughout long-term industrial handling of the substance, and it is not classified for oxidising properties according to UN Transport regulations. Further testing is not required, in accordance with Regulation (EC) No 1907/2006, Annex VII, Section 7.13, Column 2 and Annex XI, Section 1.5.