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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:
1994-04-20 to 1994-06-02
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
The study was conducted according to an internationally recognised method, and under GLP. Purity is specified, however batch number is not identified, so the isomers composition could not be retrieved from the notifier. Therefore full validation cannot apply.
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. QA statement)
UK GLP compliance programme (inspected on 31 January 1994 / signed on 16 March 1994)
Type of method:
method to determine freezing temperature
Specific details on test material used for the study:
Storage condition of test material: metal canister at 4°C in the dark
Key result
Melting / freezing pt.:
< 251 K

No evidence of solidification or freezing of the test material was observed down to a temperature of 249 K (1st determination) or 251 K (2nd determination).

The lowest value for which two determinations were achieved was retained.

Accuracy is not specified.

No further testing is required (< -20°C).
Executive summary:

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

Two runs were performed. No solidification or freezing was observed down to a temperature of 251 K (-22°C).

Description of key information

Freezing point < -22 °C

No further testing is required.

Key value for chemical safety assessment

Additional information

A reliable experimental study, conducted according to a recognized EC method and under GLP, is available. Despite restrictions due to substance identification (isomers composition unknown), it is considered as a key study. As no solidification or freezing was observed down to -22°C, the result is expressed as a limit value, and cannot be retained as key data for purpose of CSA.