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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:
2017
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:
In accordance with EU A1 Regulation (EC) No 440/2008, Annex, Official Journal of the European Union L142/1, melting point was measured by the Differential Scanning Calorimetry method (OECD Guidelines for The Testing of Chemicals, 102, July 27 1995).
Deviations:
no
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Sample:
Chemical Name Lauryl betaine
Physical State liquid - The sample was dried under a nitrogen purge to remove water prior to analysis.
CAS # 683-10-3
EU # 211-669-5
Manufacturer Colonial Chemical
Batch/lot # 53715J16
Received on November 22, 2016
Tested on January 31, 2017
Key result
Melting / freezing pt.:
>= -43.8 - <= -28.2 °C
Decomposition:
no

A freezing point with an average of 245.0°K (-28.2°C) was evident in the sample. A melting point with an average onset of 229.4°K (-43.8°C) was evident on heating. The melting point did not repeat well with a span of approximately 8°C between the replicates. This may be caused by non-homogeneity of the dried sample.

Conclusions:
A freezing point with an average of 245.0°K (-28.2°C) was evident in the sample. A melting point with an average onset of 229.4°K (-43.8°C) was evident on heating.
The melting point did not repeat well with a span of approximately 8°C between the replicates. This may be caused by non-homogeneity of the dried sample.

Description of key information

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-35.5 °C

Additional information

DSC analysis of the material, which had been dried under nitrogen prior to analysis since it was presented as an aqueous liquid, showed a range of freezing / melting temperatures. Freezing occurred at -28C and re-melting occurred at -43C. The average has been taken for this result.