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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Literature reference with study details. Study well documented, meets generally accepted scientific principles, acceptable for assessment.
Qualifier:
no guideline available
Principles of method if other than guideline:
Samples placed in melting point tubes (soft glass) and the tubes were four times evacuated to about 1 mmHg pressure and flushed with nitrogen. The tubes were then sealed off, bound to a 76 mm HG immersion thermometer and placed in a pre-heated silicone oil-bath (estimated accuracy of +-0.3) equipped with mechanical agitation.
GLP compliance:
not specified
Type of method:
capillary method
Melting / freezing pt.:
>= 189.6 - <= 190.2 °C
Atm. press.:
ca. 1 mm Hg
Decomposition:
yes
Decomp. temp.:
ca. 306 °C
Sublimation:
yes
Subl. temp.:
ca. 110 °C
Remarks on result:
other: sublimed @ 0.3 mmHg without decomposition
Melting / freezing pt.:
>= 189.8 - ca. 190.6 °C
Atm. press.:
1 mm Hg
Decomposition:
yes
Decomp. temp.:
ca. 306 °C
Sublimation:
yes
Subl. temp.:
ca. 110 °C
Remarks on result:
other: sublimed at 0.3 mm HG without decomposition
Melting / freezing pt.:
>= 191 - <= 192 °C
Decomposition:
no
Remarks:
visible signs of decomposition
Remarks on result:
other: uncorrected
Conclusions:
Melting point is 189.6 to 190.2 C.

Description of key information

Melting point from key study is 189.6 to 190.2 C at ca. 1 mm Hg. Decomposition at ca 306 C and sublimated at ca. 110 °C without decomposition.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
189.6 °C

Additional information

One key study and three supporting studies included with consistent range of melting points.