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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2017
Reliability:
1 (reliable without restriction)
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Principles of method if other than guideline:
The melting range was determined according to “Capillary tube in a metal block - Apparatus with photocell detection” in OECD 102 - “Melting Point / Melting Range”. A capillary tube loaded the sample, is placed in a heated metal block. The temperature rise is adjusted at a suitable pre-selected linear rate. A beam of light is directed through the sample to a photocell. On melting of the sample, the intensity of the light reaching the photocell increases and a stop signal is sent to the digital indicator reading out the temperature of the heating chamber.
GLP compliance:
no
Type of method:
capillary method
Melting / freezing pt.:
>= 142.2 - <= 143.7 °C
Atm. press.:
ca. 101.325 kPa

The approximate melting point of the sample was determined to be about 145.0 °C, so the start temperature was set to be below 135.0 °C (135.0 °C actually).

Results of the melting range are shown below:

No. beginning temperatures final temperatures [ °C]

1 142.4 142.3

2 143.6 143.8

Mean 142.4 143.7

Conclusions:
Based on the test results, the melting range could be confirmed: 142.2°C~143.7°C

Description of key information

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
142.2 °C

Additional information