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Boiling point

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boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1999-06-14 to 1999-08-07
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
The study was conducted according to an internationally recognised method, and under GLP. Purity and isomers composition are available from the notifier. Therefore full validation applies.
according to
EU Method A.2 (Boiling Temperature)
according to
other: ASTM E537-86
GLP compliance:
yes (incl. certificate)
UK GLP compliance programme (inspected on 23rd March 1998/ signed on 21st July 1998)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Storage condition of test material: room temperature, in the dark, under nitrogen.
Key result
Boiling pt.:
572 K
Atm. press.:
100.7 kPa
Remarks on result:
other: +/- 1 K

An endotherm, interpreted as the boiling temperature, was observed at 298.0°C (571.2 K) under 100.78 kPa, and 299.5°C (572.7 K) under 100.63 kPa, respectively for determinations 1 and 2.

Thermographic data acquired in an air atmosphere showed an exotherm formed prior to boiling. This was significantly reduced by use of a nitrogen atmosphere, indicating that the test item undergoes primarily oxidative decomposition.

Executive summary:

The boiling range of the test substance was measured under GLP according to ASTM E537-86, DSC method (listed in EU A2 guideline).

The result retained was the mean of the two runs.

The boiling point of the test substance is 298.8°C under nitrogen. The substance undergoes primarily oxidative decomposition in air.

Description of key information

Boiling point = 298.8°C (under 100.7 kPa and nitrogen atmosphere)

The substance undergoes primarily oxidative decomposition in air.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
298.8 °C

Additional information

A fully reliable experimental study, conducted according to a recognized EC method and under GLP, is available. Therefore, it is considered as a key study, and the result is retained as key value for purpose of CSA.