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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Reference
Endpoint:
melting point/freezing point
Type of information:
other: Database
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Information taken from factual databases and/or handbooks.
Qualifier:
no guideline followed
Principles of method if other than guideline:
Not applicable: handbook and database data
Type of method:
other: no data
Melting / freezing pt.:
313 °C
Remarks on result:
other: claudetite
Melting / freezing pt.:
274 °C
Remarks on result:
other: arsenolite
Conclusions:
Arsenic trioxide, in the mineral form of claudetite, is cited to have a melting point of 313°C. In the mineral form of arsenolite, the melting point is cited to be 274°C.

Description of key information

Arsenic trioxide, in the mineral form of claudetite, is cited to have a melting point of 313°C. In the mineral form of arsenolite, the melting point is cited to be 274°C. 

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
313 °C

Additional information