Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Flammability

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

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

Ammonium heptamolybdate (tetrahydrate) 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.Ammonium heptamolybdate (tetrahydrate) 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), and which therefore are incapable of further reaction with oxygen, in accordance with section 1 of REACH Annex XI . 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 ammonium heptamolybdate.

Pyrophoric properties are not plausible, since ammonium heptamolybdate is stable at ambient temperature (decomposition temperature of ammonium heptamolybdate tetrahydrate ca. 90 °C). 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 ammonium heptamolybdate 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, ammonium heptamolybdate tetrahydrate dissolves readily in water at over 200 g/L.