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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:
06 Nov 2017 - 25 Mar 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7220 (Boiling Point / Boiling Range)
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Decomposition:
ambiguous
Remarks:
reaction and/or decomposition of test item
Decomp. temp.:
> 225 °C

Preliminary Test

Starting at 150 °C, the weight of the sample decreased significantly. At 268 °C, the sample weight had decreased by 25%. After the experiment, a black molten residue remained in the sample container (original colour: off-white). The change of the colour indicated reaction and/or decomposition of the test item.

 

Main Study

An endothermic peak was observed between 100 °C and 150 °C. The extrapolated onset temperature of the peak was 129.863 °C. The endothermic effect was most likely obtained due to melting of the test item. An endothermic peak was observed starting at 225 °C. The endothermic effect was due to reaction and/or decomposition of the test item.

After the experiment, a brown/black molten residue remained in the sample container.

In order to investigate the melting peak, Experiment 2 was stopped directly after the melting peak. The extrapolated onset temperature was 129.649 °C. After the experiment, a colourless molten residue remained in the sample container. It demonstrated that melting was the reason for the endothermic effect. The melting temperature was determined as the mean melting temperature of Experiment 1 (129.863 °C) and Experiment 2 (129.649 °C).

 

Conclusion

The melting temperature of the test item was 129.8 °C (402.9K). Reaction and/or decomposition of the test item was observed during DSC experiments at temperatures of > 225 °C (> 498K). Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.

Description of key information

No boiling point, only reaction and/or decomposition at > 225 ºC (OECD 103, DSC method).

Key value for chemical safety assessment

Additional information