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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:
2014-03-18 to 2014-06-11
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP Guideline study
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Decomposition:
yes
Decomp. temp.:
186 °C
Remarks on result:
other: The test item has been determined to decompose from approximately 186°C (459K) at 99.8 to 101.9 kPa

See Thermograms attached.

Onset of decomposition from approximately 186°C (459K)

After heating to 400°C the samples had lost approximately 87% for determinations 1 and 2 and approximately 100% for determination 3 and 4 of the original sample weight.

There was no visible residue remaining in the crucibles for all four determinations.

It can be observed from the thermograms that the profile was not consistent between determinations. It was therefore considered that the initial major thermal event was the onset of decomposition; partly because it was an exotherm but also because from the representative structure of the test item it would not have been expected to boil at this temperature. The thermal event continued but changed to endothermic; this was considered to have been due to the decomposition product volatilising but decomposition may also have continued. By 400°C, the visual absence of a residue suggested that nearly all the test item had volatilised.

Conclusions:
The test item has been determined to decompose from approximately 186°C (459K) at 99.8 to 101.9 kPa
Executive summary:

Test Guidance

The determination was carried out by differential scanning calorimetry, using a procedure determined to be compatible with EC Method A2 and OECD Guideline 103.

Results

Onset of decomposition from approximately 186°C (459K)

After heating to 400°C the samples had lost approximately 87% for determinations 1 and 2 and approximately 100% for determination 3 and 4 of the original sample weight.

There was no visible residue remaining in the crucibles for all four determinations.

It can be observed from the thermograms that the profile was not consistent between determinations. It was therefore considered that the initial major thermal event was the onset of decomposition; partly because it was an exotherm but also because from the representative structure of the test item it would not have been expected to boil at this temperature. The thermal event continued but changed to endothermic; this was considered to have been due to the decomposition product volatilising but decomposition may also have continued. By 400°C, the visual absence of a residue suggested that nearly all the test item had volatilised.

Conclusion

The test item has been determined to decompose from approximately 186°C (459K) at 99.8 to 101.9 kPa

Description of key information

The test item has been determined to decompose from approximately 186°C (459K) at 99.8 to 101.9 kPa

Key value for chemical safety assessment

Additional information

The test item has been determined to decompose from approximately 186°C (459K) at 99.8 to 101.9 kPa