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Auto flammability

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relative self-ignition temperature (solids)
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
Justification for type of information:
According to Column 2 of REACH Annex VII, section 7.12., the study to determine the self-ignition temperature does not need to be conducted for solids if preliminary results exclude self-heating of the substance up to 400 °C. In the course of the determination of the melting point of the test item no self-heating has been observed up to a temperature of 400 °C (see IUCLID section 4.2 of this technical dossier). Furthermore, according to the CLP Regulation Annex I, section 2.11, the following definition is provided: a self-heating solid substance, other than a pyrophoric liquid or solid, which, by reaction with air and without energy supply, is liable to self-heat; this substance ....differs from a pyrophoric liquid or solid in that it will ignite only when in large amounts (kilograms) and after long periods of time (hours or days). The test item is an inorganic material that is manufactured from the underlying metal oxides by the Czochralski technique. As starting materials the underlying metal oxides of Lu, Y, Si and Ce are used. All oxides of the metals are present in their highest and most stable oxidation state resulting in the fact that long-time exposure to air will not result to an exothermic reaction. Based on these intrinsic properties it can be concluded that conducting a study to determine the auto-flammability is considered as scientifically not necessary under REACH.

Description of key information

According to a Column 2 adaption of REACH Annex VII, section 7.12., this study does not need to be conducted as preliminary results exclude self-heating of the test item up to 400 °C.

Key value for chemical safety assessment

Additional information