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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
21 August 2017 to 22 November 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes
Type of method:
capillary method
Key result
Decomposition:
yes
Decomp. temp.:
333 °C
Remarks on result:
other:

- The Test Material showed no definite stages of melting during the 1K/minute temperature rise, and instead appeared to decompose starting at ~333°C. Therefore, no melting point determination was made for the test material.

The following is a summary of the sample behaviour observed in both replicates during testing:

- Initially at ~330°C the sample was light brown in colour

- At ~333°C the bottom if the sample turned a darker brown.

- At ~344°C the sample turned dark brown in colour and no further physical changes were observed in the sample.

Conclusions:
Under the conditions of this study, the test material showed no definite stages of melting during the 1K/minute temperature rise, and instead appeared to decompose starting at ~333°C.
Executive summary:

The melting point of the test material was investigated in accordance with the standardised guideline OECD 102, under GLP conditions.

The melting point was determined in duplicate using digital melting point apparatus. The test material was placed into a capillary tube for analysis. Phenanthrene was used as the reference material with known melting point to verify the procedure.

Initially at ~330°C the sample was light brown in colour, at ~333°C the bottom if the sample turned a darker brown and at ~344°C the sample turned dark brown in colour and no further physical changes were observed in the sample.

Under the conditions of this study, the test material showed no definite stages of melting during the 1K/minute temperature rise, and instead appeared to decompose starting at ~333°C.

Description of key information

Under the conditions of this study, the test material showed no definite stages of melting during the 1K/minute temperature rise, and instead appeared to decompose starting at ~333°C.

Key value for chemical safety assessment

Additional information

The melting point of the test material was investigated in accordance with the standardised guideline OECD 102, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The melting point was determined in duplicate using digital melting point apparatus. The test material was placed into a capillary tube for analysis. Phenanthrene was used as the reference material with known melting point to verify the procedure.

Initially at ~330 °C the sample was light brown in colour, at ~333°C the bottom if the sample turned a darker brown and at ~344°C the sample turned dark brown in colour and no further physical changes were observed in the sample.

Under the conditions of this study, the test material showed no definite stages of melting during the 1K/minute temperature rise, and instead appeared to decompose starting at ~333°C.