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Diss Factsheets

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:
24 Oct. 2017 - 06 December 2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2008
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
inspected on 13 and 14 October 2014 / signed on 08 April 2015
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
29.06 °C
Atm. press.:
100 258 Pa

Results of Pre Test

The test item began to melt at 66°C. The temperature at which the test item was completely melted to a sticky liquid was hardly visible because the test item is very dark and high viscous.

After cooling down the test item was visual unchanged.

DSC measurements:

In the DSC runs one endothermic event was detected. Referring to the observations of the pre-test this event can be indicated as melting point.

First determination

Temperature[°C]

Energy

MeltingPoint

29.0 (Onset)

34.02[J/g]

Second determination

Temperature[°C]

Energy

MeltingPoint

29.12 (Onset)

34.68[J/g]

Observations crucibles

Mass test item

Mass crucible (before measurement):

Mass crucible (after measurement):

Observations

First

Measurement

2.30 mg

48.62 mg

46.88 mg

(weight loss = 75.7%)

The crucible was

visual unchanged and opened the test item was carbonized.

Second Measurement

 

4.62 mg

69.71 mg

66.12 mg

(weight loss = 77.7%)

 The test item had left the crucible through the perforation.

The ambient pressure was recorded with 100258 Pa.

Mean of two determinations = 29.06°C (302.21K)

Standard deviation = 0.08°C (0.08K)

As the deviation between the two independant determinations was below 0.5 K the result can be considered valid.

Executive summary:

The melting point of the test substance was determined under GLP according to OECD 102 / EU A1 guideline.

It was evaluated by the DSC method with the Onset function and determined under these circumstances as the endothermic event with 29.06 ± 0.08 °C (302.21 ± 0.08 K).

Description of key information

The melting point evaluated by the DSC method with the Onset function was determined under these circumstances as the endothermic event with:

29.06 ± 0.08 °C (302.21 ± 0.08 K)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
29.06 °C

Additional information

A reliable experimental study, conducted in accordance with conditions recommended in OECD guideline and under GLP, is available. It is considered as a key study. The result is retained as key data.