Registration Dossier

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

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.