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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:
experimental dates: July 02-04, 2008
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
The study was conducted according to an internationally recognized method, and under GLP. No deviation was reported. Test substance is adequately specified. Therefore full validation applies.
according to guideline
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
July 27, 1995
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
EEC Directive 92/69, December 1992
GLP compliance:
yes (incl. QA statement)
signed on 09 June 2008
Type of method:
method to determine freezing temperature
Key result
Melting / freezing pt.:
< -76 °C

During the main tests, the samples were cooled down from room temperature to about -76°C.

The test item increased in viscosity but was still movable. Therefore, no clear freezing point could be determined within the temperature range.

The freezing point must be below -76°C.

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

The freezing point of the test substance was determined under GLP according to OECD 102 / EU A1 guideline. The determination was carried out in duplicate.

The test item did not freeze during cooling down to -76°C. Viscosity increased, but the sample was still movable.

The freezing temperature of the test substance has been determined to be less than -76°C.

Description of key information

Freezing point < -76°C.

No further testing required.

Key value for chemical safety assessment

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. It is considered as a key study. As no crystallisation was observed down to -76°C, the result is expressed as a limit value, and cannot be retained as key data.