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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:
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
Endpoint:
flammable solids
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

Calcium molybdate is not a flammable solid. It does not exhibit pyrophoric properties, nor does it react with water under formation of flammable reaction products (see justification for classification or non-classification).

Key value for chemical safety assessment

Flammability:
not classified

Additional information

Justification for classification or non-classification

No classification required. Calcium molybdate is not a flammable solid. It does not exhibit pyrophoric properties, nor does it react with water under formation of flammable reaction products.

Flammability is not considered to be relevant for this inorganic compound in which the metal is in its highest possible oxidation state (+VI for Mo, +II for Ca), and which therefore are incapable of further reaction with oxygen. Upon heating, calcium molybdate melts at 1520 °C. No ignition is observed. 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, Dezember 2016). Further, an experimental study on the flammability of molybdenum metal powder has shown that molybdenum is not flammable in the elemental state. In conclusion, flammability cannot be expected for calcium molybdate. Pyrophoric properties are not expected, since calcium molybdate is stable at ambient temperature. This substance also does not contain any chemical groups that might lead to spontaneous ignition a short time after coming in contact with air at room temperature. Furthermore, long-term industrial experience in handling shows that calcium molybdate does not show any pyrophoric properties.

Flammability in contact with water is not considered to be relevant, because the substance 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, recent experimental testing for water solubility has also not reported any formation of gases. In contrast, calcium molybdate is only slightly soluble in water (water solubility 39.6 mg/L at 20 °C).