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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2 February 1997 to 19 March 1998
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
1992
Deviations:
no
Qualifier:
according to
Guideline:
other: ASTM E537-86
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Name: Molyvan® 855 (Oil-Free)
Description: Dark brown paste
Storage conditions: Room temperature in the dark
Boiling pt.:
> 633 K
Atm. press.:
102 kPa
Decomposition:
yes
Decomp. temp.:
365 K

As the test item decomposed prior to boiling, no value for the boiling temperature could be determined.

It is not possible to calculate a definitive boiling temperature from the data obtained in the vapour pressure study on the test item because only an estimate of the maximum vapour pressure was obtained. This is due to the test item being non-volatile and, as such, the vapour pressure study yielded a limit value. Based on these results and the chemical structure, the boiling temperature is estimated to be greater than 360 deg C (> 633 K).

A determination at reduced pressure was not performed as experience has shown that no further useful information is obtained for test materials of this nature which decompose prior to boiling at atmospheric pressure.

Data acquired by DSC:

Thermal event Temperature
Determination 1 Determination 2
deg C K deg C K
Onset of exotherm 91.4 365 98.3 371

Result: decomposed from approximately 365 K at 102 kPa, prior to any boiling.

Conclusions:
The test item decomposed from approximately 365 K at 102 kPa, prior to any boiling.
Executive summary:

In an EU Method A.2 study, conducted according to GLP, the test item decomposed from approximately 365 K at 102 kPa, prior to any boiling. Given the chemical structure(s) of the test item, the fact that the substance is non-volatile, and as such the vapour pressure study yielded a limit value, the boiling temperature is estimated to be greater than 360 deg C (> 633 K) (SafePharm Laboratories Limited, 1998).

Description of key information

Based on the chemical structure(s) of the test item, the fact that the substance is non-volatile, and as such the vapour pressure study yielded a limit value, the boiling temperature is estimated to be greater than 360 deg C (> 633 K).

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
360 °C

Additional information

In an EU Method A.2 study, conducted according to GLP, the test item decomposed from approximately 365 K at 102 kPa, prior to any boiling. Given the chemical structure(s) of the test item, the fact that the substance is non-volatile, and as such the vapour pressure study yielded a limit value, the boiling temperature is estimated to be greater than 360 deg C (> 633 K) (SafePharm Laboratories Limited, 1998).