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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:
7 Apr 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reference:
Composition 1
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Test material information:
Composition 1
Decomposition:
yes
Remarks:
heat of decompostion 226.3Jg-1
Decomp. temp.:
ca. 272.31 °C
Remarks on result:
other: Thioacid decomposes before it boils

The test was conducted in an open aluminium crucible. The sample was observed to undergo an endothermic event (melting) from 236.25°C which had a heat of melting of 165.52 J.g -1 . This was followed by an exothermic event at 272.31°C which and a heat of decomposition of 226.3 J.g -1 . No further significant energetic events were noted up to 500°C. The test results indicate that the material decomposes before it boils.

Conclusions:
The test results indicate that the material decomposes before it boils.
Executive summary:

The test is conducted to determine the temperature or temperature range of the phase transition from a liquid to a vapour. The test also determines if the sample undergoes exothermic decomposition.

A sample of Thio-Acid was charged to an open aluminium DSC crucible which was placed in the furnace. The sample was then ramped from 25C to 500C at 4 K.min-1.

The test was conducted in an open aluminium crucible. The sample was observed to undergo an endothermic event (melting) from 236.25°C which had a heat of melting of 165.52 J.g-1. This was followed by an exothermic event at 272.31°C which and a heat of decomposition of 226.3 J.g-1. No further significant energetic events were noted up to 500°C.

The test results indicate that the material decomposes before it boils.

See attached "Full Profile Graph"

Description of key information

The results of the test indicate that the material decomposes before it boils.

Key value for chemical safety assessment

Additional information

The test is conducted to determine the temperature or temperature range of the phase transition from a liquid to a vapour. The test also determines if the sample undergoes exothermic decomposition.

A sample of Thio-Acid was charged to an open aluminium DSC crucible which was placed in the furnace. The sample was then ramped from 25C to 500C at 4 K.min-1.

The test was conducted in an open aluminium crucible. The sample was observed to undergo an endothermic event (melting) from 236.25°C which had a heat of melting of 165.52 J.g-1. This was followed by an exothermic event at 272.31°C which and a heat of decomposition of 226.3 J.g-1. No further significant energetic events were noted up to 500°C.

The test results indicate that the material decomposes before it boils.