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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:
2013-07-01
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Decomposition:
yes
Remarks:
test item colour changes to almost black
Decomp. temp.:
> 290 - < 400 °C

Two measurements in aluminium crucibles with a hole showed a first endothermic effect (melting) in the temperature range of 70 - 90 °C, a second endothermic effect (presumably phase transition) in the temperature range of 190 - 230 °C and a third endothermic effect (presumably boiling) in the temperature range 290 °C - 400 °C. In order to clarify the results of the DSC measurements an additional measurement with the capillary method was performed.

From the set point at 280 °C to a temperature of 316 °C the test item is a clear colourless liquid. During further increase of the sample temperature single air bubbles emerged from the boiling capillary and additionally a change of the colour of the test item from colourless over yellow and amber into brown and at around 360 °C into almost black was observed. The test item has no boiling temperature as during the increase of the temperature the test item emerges single air bubbles but no rapidly continuous flow of air bubbles. The change of the colour while heating from colorless into almost black indicates a decomposition of the test item before achieving the boiling point.

Conclusions:
The test item has no boiling temperature as during the increase of the temperature the test item emerges single air bubbles but no rapidly continuous flow of air bubbles. The change of the colour while heating from colorless into almost black indicates a decomposition of the test item before achieving the boiling point.
Executive summary:

A study was conducted according to OECD test guideline 103 and Regulation (EC) No 440/2008 method A.2 to determine the boiling point of the test item using differential scanning calorimetry and additionally a capillary tube in a metal block.

Two measurements in aluminium crucibles with a hole showed a first endothermic effect (melting) in the temperature range of 70 - 90 °C, a second endothermic effect (presumably phase transition) in the temperature range of 190 - 230 °C and a third endothermic effect (presumably boiling) in the temperature range 290 °C - 400 °C. In order to clarify the results of the DSC measurements an additional measurement with the capillary method was performed.

From the set point at 280 °C to a temperature of 316 °C the test item is a clear colourless liquid. During further increase of the sample temperature single air bubbles emerged from the boiling capillary and additionally a change of the colour of the test item from colourless over yellow and amber into brown and at around 360 °C into almost black was observed. The test item has no boiling temperature as during the increase of the temperature the test item emerges single air bubbles but no rapidly continuous flow of air bubbles. The change of the colour while heating from colorless into almost black indicates a decomposition of the test item before achieving the boiling point.

Description of key information

According to the results of the DSC measurements and the capillary method the test item has no boiling point under atmospheric conditions. The test item decomposes before achieving the boiling point.

Key value for chemical safety assessment

Additional information

A study was conducted according to OECD test guideline 103 and Regulation (EC) No 440/2008 method A.2 to determine the boiling point of the test item using differential scanning calorimetry and additionally a capillary tube in a metal block.

Two measurements in aluminium crucibles with a hole showed a first endothermic effect (melting) in the temperature range of 70 - 90 °C, a second endothermic effect (presumably phase transition) in the temperature range of 190 - 230 °C and a third endothermic effect (presumably boiling) in the temperature range 290 °C - 400 °C. In order to clarify the results of the DSC measurements an additional measurement with the capillary method was performed.

From the set point at 280 °C to a temperature of 316 °C the test item is a clear colourless liquid. During further increase of the sample temperature single air bubbles emerged from the boiling capillary and additionally a change of the colour of the test item from colourless over yellow and amber into brown and at around 360 °C into almost black was observed. The test item has no boiling temperature as during the increase of the temperature the test item emerges single air bubbles but no rapidly continuous flow of air bubbles. The change of the colour while heating from colorless into almost black indicates a decomposition of the test item before achieving the boiling point.