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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

melting point/freezing point
Type of information:
experimental study
Adequacy of study:
weight of evidence
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Data from peer-reviewed handbook or collection of data.
Reason / purpose for cross-reference:
reference to same study
Principles of method if other than guideline:
Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor was the experimental method.
GLP compliance:
Key result
Decomp. temp.:
> 300 °C
Remarks on result:
other: Upon heating to 300-800 °C, ammonia and water are evolved. The decomposition becomes more complete as temperature and duration of heating are increased.
On heating ammonium paratungstate to 300-800 °C, ammonia and water are evolved.

Description of key information

Ammonium paratungstate decomposes at temperatures above 300°C.

Key value for chemical safety assessment

Additional information