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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2009-11-16 to 2009-12-11
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2008
Deviations:
no
Principles of method if other than guideline:
NA
GLP compliance:
yes (incl. certificate)
Type of method:
capillary method
Key result
Melting / freezing pt.:
> -66.6 - < -66.2 °C
Atm. press.:
1 013.25 hPa

No remarks

Conclusions:
The melting range of tert.-Butylperoxy- 2-ethylhexanoat was determined with -67.6 to -66.2 °C (205.7 to 207.0 K). These values are the mean of two independent determinations.
Executive summary:

The mean between both determinations gives the following value for the melting point:

Melting point

-67.6 to -66.2 °C (205.7 to 207.0 K)

Standard deviation

0.49 (begin); 0.14 (end)

Estimated accuracy

± 0.7oC

The validity criterion “difference between duplicate determinations” was not met. The test item tert.-Butylperoxy- 2-ethylhexanoat showed a melting range, no melting point. Because of the very low melting point, start of melting was difficult to observe, as the block starts to warm up as soon as it is taken out of the deep freezer. Therefore, the difference between duplicate determinations was too high, regarding the begin of the melting range. For assessment of the test item’s behaviour in the environment, this difference is regarded as not relevant. No observations were made which might cause doubts on the validity of the study out-come. Therefore, the result of the study is considered valid. The melting range of tert.-Butylperoxy- 2-ethylhexanoat was determined with -67.6 to -66.2 °C (205.7 to 207.0 K). These values are the mean of two independent determinations.

Description of key information

Following EU-Method A.1, the melting range of tert.-Butylperoxy- 2-ethylhexanoat  was determined to be - 67.3 °C (206 K). The value represents the mean of two independent determinations.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-67.3 °C

Additional information