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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:
From 2018-12-24 to 2019-03-22
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study performed to current OECD guidelines with no significant deviations and run in OECD GLP certified lab.
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Purity: 99.7%
Batch No.: 80031745a
Key result
Decomposition:
yes
Decomp. temp.:
> 250 °C
Remarks on result:
other: the test item has no boiling temperature

Preliminary Test

Starting at 250°C, the weight of the sample decreased significantly. At 320°C, the sample weight had decreased by 25%.

After the experiment, a black molten residue remained in the sample container (original colour:off-whitebased on visual observation of a technician). The change of the colour indicated reaction and/or decomposition of the test item.

Main Study

An endothermic effect was observed between 100°C and 150°C followed by an endothermic effect starting at 250°C. The extrapolated onset temperature of the first effect was 124.513°C. The endothermic effect was most likely obtained due to melting of the test item. The second endothermic effect was probably obtained due to reaction and/or decomposition of the test item.

After the experiment, a dark brown molten residue remained in the sample container (original colour: off white based on visual observation of a technician). The change of the colour indicated reaction and/or decomposition of the test item. Based on this visual observation, it was found that the test item had molten and the change of the colour demonstrated reaction and/or decomposition of the test item.

In order to investigate the endothermic effect, Experiment 2 was stopped directly after the melting effect. The extrapolated onset temperature was 124.609°C. After the experiment, a white molten residue remained in the sample container (original colour: off white based on visual observation of a technician). It demonstrated that melting was the reason for the endothermic effect.

The melting temperature was determined as the mean melting temperature of Experiment 1 (124.513°C) and Experiment 2 (124.609°C).

Conclusions:
Reaction and/or decomposition of the test item was observed during DSC experiment at temperatures of > 250°C (> 523K). 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.
Executive summary:

The boiling temperature of the test item were determined by DSC.

Reaction and/or decomposition of the test item was observed during DSC experiment at temperatures of > 250°C (> 523K). 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

Reaction and/or decomposition of the test item was observed during DSC experiment at temperatures of > 250°C (> 523K).  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.

Key value for chemical safety assessment

Additional information

The boiling temperature of the test item were determined by DSC.

Reaction and/or decomposition of the test item was observed during DSC experiment at temperatures of > 250°C (> 523K). 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.