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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
not reported
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Valid with restrictions. This is peer reviewed data where the test methodology and identity of the substance have been evaluated, and a reliable and representative value for the endpoint has been selected.
Remarks:
No information on GLP status or test guideline followed is available.
Qualifier:
no guideline available
Principles of method if other than guideline:
Literature does not specify the method. Data from peer reviewed source.
GLP compliance:
not specified
Type of method:
other: not specified
Melting / freezing pt.:
ca. 1 850 °C
Remarks on result:
other: Information on atm pressure not provided.
Remarks:
Assume the melting point relates to standard atm pressure.
Conclusions:
The melting point of the substance is reported to be ~1850 °C.
Executive summary:

According to the literature data, the melting point of the substance is ~1850 °C.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
not reported
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Valid with restrictions. This is peer reviewed data where the test methodology and identity of the substance have been evaluated, and a reliable and representative value for the endpoint has been selected.
Remarks:
No information on GLP status or test guideline followed is available.
Qualifier:
no guideline available
Principles of method if other than guideline:
Literature data does not specify the method. Data from peer reviewed source.
GLP compliance:
not specified
Type of method:
other: not reported
Melting / freezing pt.:
1 850 °C
Remarks on result:
other: Information on atm pressure not provided.
Remarks:
Assume the melting point relates to standard atm pressure.
Conclusions:
The melting point of the substance is reported to be 1850 °C.
Executive summary:

According to the literature data, the melting point of the substance is 1850 °C.

Description of key information

Melting point (Xiao et al., 2020):

According to the literature data, the melting point of the substance is 1850 °C.

Melting point (Arthur et al., 2013):

According to the literature data, the melting point of the substance is ~1850 °C. 

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
1 850 °C

Additional information

Two literature references reporting the melting point of the substance are available. Since both relate to peer reviewed literature papers, both have been assigned a

a reliability score of 2 in accordance with the criteria set forth by Klimisch et al. (1997). As such, each result is given an equal weight, though both values are in good agreement with each other. The paper by Xiao et al. reported a melting point for the substance of 1850 °C, while the paper by Arthur et al. reported a melting point of ~1850 °C.

The value taken forward for chemical safety assessment is therefore 1850 °C.