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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:
29 June, 2009 - 6 August, 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study has been performed according to OECD and/or EC guidelines, and according to GLP principles.
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
other: Differential Scanning Calorimetry
Melting / freezing pt.:
283 K
Atm. press.:
101.1 kPa
Decomposition:
no

Preliminary test:

From 175°C upwards the weight of the sample decreased significantly. At 226°C the sample weight has decreased by 25%. After the experiment, there was no residue onserved in the sample container. The test substance had evaporated from the sample container.

Main study:

First experiment:

During cooling (not reported on detail), no effects were observed which were due to crystallization of the test substance. During heating, a glass transition at approximately -75 °C and an endothermic peak between 175 °C and 250°C was observed. The extrapolated onset temperature of the latter peak was 228.43°C. This effect was attributed to boiling of the test substance. After the experiment it was observed that the test substance has evaporated from the sample container.

Second experiment:

During cooling (not reported on detail), no effects were observed which were due to crystallization of the test substance. During heating, a glass transition was observed at approximately -75°C as well as an exothermic peak between -50°C and -25°C and two endothermic peaks. The first endothermic peak was observed between 0°C and 25°C. The extrapolated onset temperature of the peak was 9.12°C. Melting of the test substance caused this effect. A second ensothermic peak was observed between 175°C and 250°C. The extrapolated onset temperature of this peak was 229.04°C. This effect was caused by boiling of the test substance. After the experiment it was observed that the etst substance has evaporated from the sample container.

Third experiment:

During cooling (not reported on detail), no effects were observed which were due to crystallization of the test substance. During heating, a glass transition was observed at approximately -75°C as well as an exothermic peak between -50°C and -25°C and an endothermic peak between 0°C and 25°C. The exothermic effect was caused by crystallization of the test substance. The endothermic peak with an extrapolated onset temperature of 9.96°C was caused by melting of the test substance. After the experiment, a colourless celar liquid residue remained in the sample container.

Conclusions:
Using DSC the melting temperature of 2-sec-butylphenol was determined to be 10°C (283 K) at 101.1 kPa.
Executive summary:

The melting point of 2 -sec-butylphenol was determined using differential scanning calorimetry (DSC). The study followed OECD Guideline 102 (Melting Point/Melting range) and EU Method A.1 (Melting / Freezing Temperature). As a safety precaution for the DSC cell, a preliminary test was performed using a thermogravimetric analyzer (TGA). In the main study, three tests were performed. According to the DSC curves obtained, the melting temperature of the test substance was 10°C (283 K) at 101.1 kPa.

Description of key information

melting point: 10°C (283 K) at 101.1 kPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
10 °C

Additional information

The melting point of 2 -sec-butylphenol was determined using differential scanning calorimetry (DSC). The study followed OECD Guideline 102 (Melting Point/Melting range) and EU Method A.1 (Melting / Freezing Temperature). As a safety precaution for the DSC cell, a preliminary test was performed using a thermogravimetric analyzer (TGA). In the main study, three tests were performed. According to the DSC curves obtained, the melting temperature of the test substance was 10°C (283 K) at 101.1 kPa.