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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:
1996-12-02 to 1997-01-19
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
other: 92/69/EWG, A.1 (DSC)
Version / remarks:
1992
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
99 °C
Atm. press.:
101.325 Pa
Decomposition:
yes
Decomp. temp.:
160 °C
Remarks on result:
other: probably due to impurities melting at about 79 °C.

The melting temperature of the test item was determined to be 99 °C (372 K). Probably because of some impurities the melting process started at lower temperatures of about 79 °C (352 K). The test substance probably is not stable (in an air atmosphere) at a temperatures above about 160 °C.

Conclusions:
The melting temperature of the test item was determined to be 99 °C, probably caused by impurities with lower melting points. The test substance is not stable at a temperatures above about 160 °C.
Executive summary:

The determination of the melting temperature was based on the following guideline: European Economic Community (EEC), EEC-Directive 92/69 EEC, Part A, Methods for the determination of physico-chemical properties, A.1 „ Melting/Freezing temperature“, EEC Publication No. L883, December 1992.

Using a differential scanning calorimeter (DSC), both, the test substance and a reference were heated, using one single heat source. The difference between the enthalpy changes which occurs was recorded.

From the resultant curve, the melting temperature of the test item was determined.

 

The melting temperature of the test item was determined to be 99 °C (372 K). Probably because of some impurities the melting process started at lower temperatures of about 79 °C (352 K). The test substance probably is not stable (in an air atmosphere) at a temperatures above about 160 °C (433 K).

Description of key information

The melting temperature of the test item was determined to be 99 °C. The substance decomposes above 160°C (reference 4.2 -1)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
99 °C

Additional information

The determination of the melting temperature was based on the following guideline: European Economic Community (EEC), EEC-Directive 92/69 EEC, Part A, Methods for the determination of physico-chemical properties, A.1 „ Melting/Freezing temperature“, EEC Publication No. L883, December 1992.

Using a differential scanning calorimeter (DSC), both, the test substance and a reference were heated, using one single heat source. The difference between the enthalpy changes which occurs was recorded.

From the resultant curve, the melting temperature of the test item was determined.

 

The melting temperature of the test item was determined to be 99 °C (372 K). Probably because of some impurities the melting process started at lower temperatures of about 79 °C (352 K). The test substance probably is not stable (in an air atmosphere) at a temperatures above about 160 °C (433 K).