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Physical & Chemical properties

Flammability

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Endpoint:
substances / mixtures which in contact with water emit flammable gases
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is known to be soluble in water to form a stable mixture
Endpoint:
flammable solids
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Endpoint:
pyrophoric solids
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied

Description of key information

Strontium oxide is not classified as highly flammable, has no pyrophoric properties and does not emit flammable gases in contact with water.

Key value for chemical safety assessment

Flammability:
not classified

Additional information

Flammability of solids

Testing of flammability is not considered to be required for metal oxides in which (i) the cation is in its highest possible oxidation state (e.g. Sr2+) and which therefore is incapable of further reaction with oxygen, and (ii) the anionic component is similarly not capable of further reaction with oxygen. This substance can thus be designated as non-flammable. (Guidance on information requirements and chemical safety assessment Chapter R.7a: Endpoint specific guidance, section R.7.1.10.3)

Pyrophoric properties

Testing for pyrophoric properties is not considered to be required, since strontium oxide is stable at ambient temperature. It does not contain any chemical groups that might lead to spontaneous ignition a short time after coming in contact with air at room temperature (ca. 20 °C) . Furthermore, long-term industrial experience in handling shows that strontium oxide does not ignite in contact with air (in accordance with Regulation (EC) No 1907/2006, Annex XI, Section 1).

Flammability in contact with water

The study does not need to be conducted because the substance is known to be soluble in water to form a stable mixture. Strontium oxide dissolves in water under formation of a stable hydroxide.

Justification for classification or non-classification