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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:
2008-06-30 till 2009-03-13
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
thermal analysis
Key result
Melting / freezing pt.:
>= 21.2 - <= 26.4 °C
Atm. press.:
ca. 1 atm
Decomposition:
no

 

Melting point (first peak)

Determination

To

Onset temperature

Tei

 

Initial extrapolated temperature

 

First melting with thermal past

Tp

 

Peak temperature

 

First melting with termal past

1

2

3

+8.4°C

+8.2°C

+9.7°C

+21.4°C

+21.1°C

+21.0°C

+27.0°C

+26.4°C

+25.9°C

Mean

Standard Deviation

+8.8°C

0.8°C

+21.2°C

0.3°C

+26.4°C

0.6°C

The result given represents the mean value of three independant runs. The standard deviation was 0.3°C for the lower limit of the melting point temperature range, and 0.6°C for the upper limit of the melting point temperature range.

As temperatures Tei and Tp differs from more than 0.5°C, they are both reported in the results.

Melting range:

Initial extrapolated temperature: Tei = +21.2°C

Peak temperature: Tp = +26.4°C

Conclusions:
The melting raneg for the test item 10-undecenoic acid was determined to be : 21.2-26.4 °C.
Executive summary:

The melting point was determined for the test item 10 -undecenoic acid according to a OECD Guideline 102 study, under GLP. The thermal analysis method was applied, using Differential Scanning Calorimetry (DSC). The initial extrapolated temperature is 21.2°C and the peak temperature is 26.4 °C thus the melting range of the substance is : 21.2 -26.4°C.

Description of key information

The melting range was determined to be 21.2-26.4 °C at normal atmospheric pressure.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
26.4 °C

Additional information

A OECD Guideline 102 study without deviations and under GLP is available. The thermal analysis method was applied, using Differential Scanning Calorimetry (DSC). The melting range was determined to be : 21.2-26.4°C. Key value for chemical safety assessment: 26.4°C (peak temperature).