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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:
2015-07-20
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted according to an appropriate OECD test guideline and under the quality standard of ISO 9001:2008
Qualifier:
according to guideline
Guideline:
other: ISO 3016 Pour point
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
EC test guideline A.1 / 1.4.5 / 1.6.5 Pour point
Principles of method if other than guideline:
The pour point is the lowest temperature at which movement of the test substance is still observed. The valid temperature range of the pour point is 223 K (-50°C) to 323 K (+50°C) with an accuracy of ± 3.0 K.
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
pour point
Key result
Melting / freezing pt.:
-24 °C
Atm. press.:
1 013 hPa
Decomposition:
no
Key result
Melting / freezing pt.:
249.2 K
Atm. press.:
1 013 hPa
Decomposition:
no

Result:–24 °C, 249.2 K

Time [min]

Sample Temperature[°C]

Observations

0 (start)

25

clear liquid

5

15

clear liquid

10

10

clear liquid

15

5

clear liquid

20

0

clear liquid

25

-5

clear liquid

35

-10

clear liquid

40

-15

clear liquid

50

-20

slightly viscous

55

-22.5

very much viscous

60

-25

nearly solid

70

-27

solid (no movement)

 

Conclusions:
The melting point according to EC test guideline A.1 / 1.4.5 / 1.6.5, ISO 3016 Pour point test was -24 °C.
Executive summary:

The melting point according to EC test guideline A.1 / 1.4.5 / 1.6.5, ISO 3016 Pour point test was -24 °C.

Description of key information

Melting point: -24°C at 1013 hPa (ISO 3016)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-24 °C

Additional information

Two melting/freezing point studies were performed for the submission substance. In the study conducted using a Differential Scanning Calorimetry (DSC) method, no clear freezing/melting point was detected for the substance. In the second study using a pour point method in accordance with ISO 3016 Test method and in compliance with a known quality system (ISO 9001:2008), a freezing temperature of -24°C at 1013 hPa was determined for the submission substance. This result is considered to be reliable and is selected as key study.

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