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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:
20.06. - 06.12.06
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
> 87 - < 90 °C
Atm. press.:
1 013.3 hPa
Decomposition:
no
Sublimation:
no

Two DSC measurements with a heating range of 10 K/min showed an endothermal effect (melting in the temperature range of 60 - 105 °C with onset temperatures of 87.08 °C and 89.11 °C, respectively. The onset temperature (see Table 1) was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline.

 

Table 1: Melting point (DSC measurements)

Ident No.

Test item/ mg

Starting temperature / °C

Final test temperature / °C

Temperature range (melting) /°C

Onset / °C

Crucible

Observations after the measurement

35624

8.09

25

500

60 - 105

87.08

Aluminium with a hole

--

35626

10.22

25

150

65 - 100

89.11

Aluminium with a hole

Test item was a solidified clear melt

 

The test item had a melting range of 87 - 90 °C.

Conclusions:
The DSC measurements showed that the test item had a melting range of 87 - 90 °C.
Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1. The melting range was determined by differential scanning calorimetry (DSC 25 - 500 °C). The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded. The DSC measurements showed that the test item had a melting range of 87 - 90 °C under atmospheric conditions.

Description of key information

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1. The melting range was determined by differential scanning calorimetry (DSC 25 - 500 °C). The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded. The DSC measurements showed that the test item had a melting range of 87 - 90 °C under atmospheric conditions.

Key value for chemical safety assessment

Additional information