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Diss Factsheets

Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
experimental dates: 15-16 October 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method with no deviation, and under GLP. The substance is considered to be adequately characterised, with isomers composition. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
Version / remarks:
27 July 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Version / remarks:
Commission Regulation No 440/2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed on 15 Nov. 2018
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Storage conditions of test material: Stored refrigerated (2-8°C) in aluminium bottle. An injection of nitrogen conditions gas is performed into the bottle after each sampling to keep the test item under nitrogen atmosphere during the storage period.
Key result
Boiling pt.:
268.2 °C
Atm. press.:
101.3 kPa
Decomposition:
no

Pre-study

Peak assigned to the boiling of the substance was observed and measurement was stopped at 325°C.

Boiling was recorded as two sharp and mixed peaks; the initial boiling point of the substance was observed at 264.4°C, as the onset of the 1st peak.

Temperatures corresponding to these peaks were used to create the following temperature program:

 Initial temperature  Final Temperature  Heating rate  Duration  Furnace atmosphere  Gas flow
 -120°C  330°C  10°C/min  40 min  Helium  60 mL/min

First Determination

Initial boiling point was observed at 266.7°C (onset temperature of the 1st peak related to boiling) and a corresponding mass loss was observed on the TG curve, showing that all the substance was evaporated at the end of the study.

The crucible was visually checked after the determination: By opening the crucible, no test item left in the crucible and no sign of decomposition was observed.

Atmospheric pressure: 98.0 kPa.

Second Determination

Initial boiling point was observed at 266.6°C (onset temperature of the 1st peak related to boiling) and a corresponding mass loss was observed on the TG curve, showing that all the substance was evaporated at the end of the study.

The crucible was visually checked after the determination: By opening the crucible, no test item left in the crucible and no sign of decomposition was observed.

Atmospheric pressure: 98.0 kPa.

The corrected values following Sidney-Young equation were determined to be 268.2°C (mean of 268.2°C at 101.3 kPa for the first determination and 268.1°C at 101.3 kPa for the second determination).

Executive summary:

The boiling point of the test substance was determined under GLP according to OECD 102 / EU A1 guideline, using DSC method.

Boiling was recorded as two sharp and mixed peaks, therefore the onset temperature of the 1st peak was retained as the initial boiling point.

Two main runs were performed, under helium; measurements were corrected for normal atmospheric pressure, and the mean final temperature was retained.

The initial boiling temperature of test substance has been determined to be 268.2°C, under normal atmP and inert atmosphere.

Description of key information

Experimental boiling point = 268.2°C (as corrected to normal atmP and under inert atmosphere).

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
268.2 °C

Additional information

A fully reliable experimental study, conducted according to a recognized EC method and under GLP, is available. It is considered as key study, and the result is retained as key data.