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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 experience in production or handling shows that the substance does not react with water, e.g. the substance is manufactured with water or washed with water
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

Zinc difluoride can be designated as non-flammable, to have 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 inorganic metal salts (i.e., zinc difluoride) in which (i) the cation is in its highest possible (stable) oxidation state and which therefore is incapable of further reaction with oxygen, and (ii) the anionic component is similarly not capable of further reaction with oxygen. Zinc(2+) represent the highest possible oxidation state, the 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).

 

Flammability in contact with water

Zinc difluoride 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, long-term industrial experience in practical handling of the substance shows that it does not react with water (cf. section 1, Annex XI of Regulation (EC) 1907/2006).

 

Pyrophoric properties

Zinc difluoride does not contain any chemical groups that might lead to spontaneous ignition a short time after coming in contact with air at room temperature (circa 20 °C). The ionic and anionic compounds of zinc difluoride are present in stable oxidation states. Furthermore, long-term industrial experience in handling shows that the substance does not ignite in contact with air (cf. section 1, Annex XI of Regulation (EC) 1907/2006).

Justification for classification or non-classification

Zinc difluoride does not need to be classified according to CLP Regulation (EC) No 1272/2008 since it is not highly flammable