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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:
08 May 2003
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.2 (Boiling Temperature)
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
- Batch: 8191-34
- Purity: 97.8% (expressed as primary amine, % of total)
Key result
Decomposition:
yes
Decomp. temp.:
>= 148 °C
Remarks on result:
other: Atmospheric pressure was not reported; ambient conditions are anticipated.

The DSC curves showed a small exothermic effect (onset at 148 - 150 °C) probably caused by a reaction or decomposition; the substance changed from clear colourless to light yellow.

Under further heating a sharp endothermic peak (onset at 260 - 270 °C) was observed, probably caused by evaporation of the substance. The extrapolated onset temperature (280 - 282 °C) could be concluded to be the boiling temperature; however as discoloration of the substance had already occurred at a lower temperature, this should be regarded as the boiling temperature of the reacted and/or decomposed substance.

A further significant exothermic reaction occurred immediately after the endothermic reaction indicating further reaction and / or decomposition which is confirmed by a loss of sample weight (85 - 98%) and a further coloration (to brown).

Conclusions:
The test substance starts to decompose at 148 °C under ambient conditions.

Description of key information

In a GLP study according to test methods EC A.2 and OECD 103 (differential scanning calorimetry), the substance was determined to decompose at and above 148°C (Van der Baan-Treur, 2003).

Key value for chemical safety assessment

Additional information

The substance was concluded to decompose before its boiling temperature.