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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:
from 2017-04-11 to 2017-04-12
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
1998
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
< -100 °C
Atm. press.:
>= 1 008 - <= 1 013 hPa
Decomposition:
no
Sublimation:
no

During the cooling and subsequent heating phase, no thermal effects were observed in the temperature range from -100 to 25 °C. It can be assumed that the test item has no melting or freezing point in this temperature range. Therefore the test item has no melting point down to a temperature of -100 °C.

Conclusions:
The test item has no melting point down to -100 °C at atmospheric pressure (1008 and 1013 hPa, respectively).
Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OPPTS test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry (2017). The test item was weighed out into an aluminium crucible under an inert atmosphere. Two tests with about 16 – 17 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The substance is a liquid at ambient conditions. Therefore the crucibles were cooled down from ambient temperature to -100 °C with a constant cooling rate of 0.25 K/min under an inert atmosphere. After a waiting period of 30 min at -100 °C, the temperature was increased up to 500 °C at a constant heating rate of 10 K/min. In the temperature range of 50 °C – 200 °C, an endothermic effect were observed, which can be assigned to the boiling of the test item. According to the results of the study, the test item has no melting point down to -100 °C at atmospheric pressure. No observations were made which cause doubt on the validity of the outcome of the study.

Description of key information

The melting point was determined to be < -100 °C at 1013.25 hPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-100 °C

Additional information

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1 and EPA OPPTS test guideline 830.7200 to determine the melting point of the test item using differential scanning calorimetry (2017). The test item was weighed out into an aluminium crucible under an inert atmosphere. Two tests with about 16 – 17 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The substance is a liquid at ambient conditions. Therefore the crucibles were cooled down from ambient temperature to -100 °C with a constant cooling rate of 0.25 K/min under an inert atmosphere. After a waiting period of 30 min at -100 °C, the temperature was increased up to 500 °C at a constant heating rate of 10 K/min. In the temperature range of 50 °C – 200 °C, an endothermic effect were observed, which can be assigned to the boiling of the test item. According to the results of the study, the test item has no melting point down to -100 °C at atmospheric pressure. No observations were made which cause doubt on the validity of the outcome of the study.