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Physical & Chemical properties

Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1995-04-24 to 1995-04-25
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
The study was conducted according to an internationally recognised method, and under GLP. No deviation affected the quality of the study. Purity is specified in the report, and isomers composition is available from the notifier. Therefore full validation applies.
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
Commission Directive 92/69/EEC
GLP compliance:
yes (incl. QA statement)
Inspected on 31 January 1994. Signed on 16 March 1994
Type of method:
method to determine freezing temperature
Key result
Melting / freezing pt.:
< -20 °C

At the beggining of the test, the test material was a clear colourless liquid. Then, no change was observed down to 263 or 255K (respectively for determination 1 and 2), where the test material was more viscous. At lower temperatures, no change was observed again.

No solidification or freezing of the test material was observed down to a temperature of 253 K.

Accuracy: +/-0.5 K

No further testing is required.
Executive summary:

The freezing point of the test substance was measured under GLP according to EU A1 guideline.

An aliquot was placed in a cooling bath, stirred, and the temperature was recorded at regular intervals. Two runs were performed.

No solidification or freezing of the test material was observed down to a temperature of 253 K (-20°C).

Description of key information

Freezing point (exp.) < -20 °C.

No further testing is required.

Key value for chemical safety assessment

Additional information

A fully reliable experimental study, conducted according to a recognized EC method and under GLP, is available. Therefore, it is considered as a key study. As no crystallisation was observed down to -20°C, the result is expressed as a limit value, and cannot be retained as key data.