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Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
27 May 2010-15 July 2010
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
This study has been performed according to OECD and EC guidelines and according to GLP principles. Test substance is adequately characterised. Therefore full validation applies.
according to guideline
OECD Guideline 102 (Melting point / Melting Range)
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. QA statement)
Type of method:
thermal analysis
Differential Scanning Calorimetry + ThermoGravimetric Analysis
Melting / freezing pt.:
< -90 °C
Atm. press.:
1 010 hPa
Remarks on result:
other: Freezing of the test substance was not observed (under nitrogen).

Main Study

During initial experiments, aluminium sample pans were used. During these experiments exothermic effects were observed which are assigned to reaction of the test substance with the aluminium sample pan. Therefore golden pans were used in order to determine the melting point of the test substance.


During the first experiment, during cooling no effects were observed which were due to crystallization.


With the second experiment, essentially the same results as during the first experiment were obtained.

No further testing required.
Executive summary:

The freezing point of aluminium chloride basic (as aqueous solution) was investigated according to OECD/EC guidelines, DSC method. Two assays were performed under nitrogen. No freezing (i.e. transition to solid form) was observed down to -90°C.

Description of key information

Freezing point < -90 °C (aqueous solution as manufactured).

No further testing is 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. Therefore, it is considered as a key study. As no crystallisation was observed down to -90°C, the result is expressed as a limit value, and cannot be retained as key data for purpose of CSA.