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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 dibasic lead stearate 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 Dibasic lead stearate is justifiable, under RAAF scenario 2.

Justification for classification or non-classification

Dibasic lead stearate does not require classification for oxidising properties based on a comparison of the oxidation state and oxygen-to-lead ratio of lead monoxide to a tested substance, orange lead, which was concluded "non oxidising", and long-term industrial handling experience.

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.

Testing according to EU Method A.17 was carried out on lead tetroxide (orange lead; Pb3O4) in 2005. From the test results it is 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 Dibasic lead stearate is only in the oxidation state +II and is thus intrinsically less oxidising.

The long chain stearate group of this compound provides an increased electron density to the carboxylate moiety which would reduce the ability to accept electrons from other species. Furthermore, it forms a strong ionic bond to the lead atom, which increases the stability of the structure and decreases the likeliness of oxygen donation.

Testing of Dibasic lead stearate is not required, in accordance with Regulation (EC) No 1907/2006, Annex XI, Section 1.5: read-across of results and conclusion on classification from lead tetroxide to the target substance is justifiable, under RAAF scenario 2.