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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Remarks:
The study was conducted according to the test guidelines in effect at the time of study conduct.
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Remarks:
The study was conducted according to the test guidelines in effect at the time of study conduct.
GLP compliance:
yes
Type of method:
other: metal block method
Key result
Melting / freezing pt.:
>= 150 °C
Atm. press.:
1 013.25 mBar
Decomposition:
yes
Decomp. temp.:
> 150 °C
Sublimation:
no
Remarks on result:
other: The test item was determined to partially melt before decomposing at temperatures above approximately 150°C.

In the trial determination using the metal block method, the test substance partially melted between room temperature and approximately 50˚C, but was not fully molten by the time the sample appeared to decompose at approximately 150˚C as evidenced by rapid evolution of gas and expansion up the melting capillary.

From the DSC trace, a broad endotherm was observed below 100˚C, in agreement with the initial melting seen in the metal block test, and this was followed from approximately 150˚C by a series of exotherms indicating decomposition.

Conclusions:
This study and the conclusions which are drawn from it fulfil the quality criteria (validity, reliability, repeatability).
The test item was determined to partially melt before decomposing at temperatures above approximately 150˚C.
Executive summary:

A study was performed to determine the melting temperature of the test item according to EC Method A.1 and OECD Method 102. The melting temperature was determined using the metal block method and differential scanning calorimetry (DSC). The melting temperature was initially examined using the metal block method. The waxy test substance was ground in the presence of liquid nitrogen to facilitate packing into a capillary tube to a height of 3 mm. In a trial determination, the capillary tube was placed in the apparatus and heated at 10°C/minute. As the melting temperature was indeterminate using the metal block method, DSC was subsequently performed in a nitrogen atmosphere at a heating rate of 5°C/minute.

The test item was determined to partially melt before decomposing at temperatures above approximately 150°C.

Description of key information

Test substance partially melted before decomposing at temperatures above approximately 150°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
150 °C

Additional information

OECD Guideline 102

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