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Physical & Chemical properties

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:
2012-09-20 - 2012-12-19
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study with certificated GLP compliance. No methodology deficiencies are reported.
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
yes (incl. certificate)
Remarks:
The Department of Health of the Government of The United Kingdom
Type of method:
pour point
Melting / freezing pt.:
< -20 °C
Remarks on result:
other: Pour point determination since the substance is a complex mixture in a carrier oil.

As the test substance is a complex mixture and contains a carrier oil, the pour point method was considered as the appropriate method. The test substance remained mobile down to -23 °C but gradually became more viscous as the temperature decreased.

Conclusions:
The study report describes a valid guideline study conducted under certificated GLP compliance. The pour point was determined to be < -20 °C.
Executive summary:

The pour point of magnesium sulfonate target substance (CAS 231297-75-9) was determined in accordance to OECD 102 / EU Method A.1 (Fox, 2012). This method was considered as most appropriate since the test substance is a complex mixture and contains a carrier oil. A test jar enclosed in a glass jacket was used for test performance. The sample was heated (up to 48 °C) and then stepwise cooled in air, an ice/water bath and an ice/acetone bath down to -18 °C. At intervals of 3 °C, the sample was tilted to a horizontal position for a period of 5 seconds, during which the sample was observed for signs of flow. The test substance remained mobile down to -23 °C but gradually became more viscous as the temperature decreased. Therefore, the pour point was determined to be < - 20 °C.

Description of key information

OECD 102/EU Method A.1_Pour point < - 20 °C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-20 °C

Additional information

The key value was determined using the pour point method according to OECD Guideline 102 / EU Method A.1 (Fox, 2013). Since the test substance is a complex mixture containing a carrier oil, the pour point method was considered as the most appropriate determination.