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Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 26 Sep 2007 to 04 Jan 2008

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

other: combination of thermal analysis and visual test

Melting / freezing pt.:

< -75 °C

Decomposition:

no

In the preliminary test, DIMETHYL 2-METHYL GLUTARATE was stored 24 hours at -20°C in a freezer. As the sample was not frozen after this time, the freezing temperature of DIMETHYL 2-METHYL GLUTARATE is below -20°C.

During the main tests, about 3 mL and 5 mL, respectively, of the test item placed in a small test tube were cooled down from room temperature to about -75°C using a dry ice and acetone mixture.

During both main tests, the test item increased in viscosity and became turbid but was still movable. Therefore, no clear freezing point could be determined within the temperature range between 20 °C and -75 °C.

Conclusions:

DIMETHYL 2-METHYL GLUTARATE did no freeze under the conditions of the test.

Executive summary:

The freezing point / freezing range of DIMETHYL 2-METHYL GLUTARATE was determined according to the method EEC Directive 92/69, Part A.1, to the OECD Guideline No. 102 and to the GLP.

During the main tests, about 3 mL and 5 mL, respectively, of the test item placed in a small test tube were cooled down from room temperature to about -75°C using a dry ice and acetone mixture.

During both main tests, the test item increased in viscosity and became turbid but was still movable. Therefore, no clear freezing point could be determined within the temperature range between 20 °C and –75 °C.

DIMETHYL 2-METHYL GLUTARATE did no freeze under the conditions of the test.

Description of key information

DIMETHYL 2 -METHYL GLUTARATE did no freeze under the conditions of the test (freezing point < -75°C).

Additional information

One experimental study, scored as Klimisch 1, is available (Weissenfeld M., 2008) and selected as a key study.