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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
2002-06-06 to 2002-07-16
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Key result
Atm. press.:
998.2 hPa
Remarks on result:
other: In a DSC study carried out between -150°C and 300°C, no melting point was observed; a glass transition was reported at -129°C.
Melting / freezing pt.:
< -30 °C
Remarks on result:
other: In the same study report, melting point of <-30°C was reported for the substance. Information on atmospheric pressure was not stated.

The measurements were performed a total number of four times. Two of the tests were abolished because of obvious hydrolysis. The other two were used for evaluation. After cooling down, there were no residues of the test item in the sample holders. The substance was completely evaporated.

Interpretation of results:

There was no melting point detected. Between -130°C to -126°C, the test item exhibits a glass transition (Tg = -129°C). The DSC thermograms are attached

Conclusions:
In a DSC study carried out between -150°C and 300°C, no melting point was observed; a glass transition was reported at -129°C using an appropriate test method. The result is considered reliable. Also, limit melting point of <-30°C was reported in the same study report.
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
weight of evidence
Study period:
2015-05-13
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted in accordance with relevant test method and in compliance with a known quality system ISO 9001:2008
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
< -100 °C
Atm. press.:
1 013 hPa
Key result
Melting / freezing pt.:
< 173 K
Atm. press.:
1 013 hPa

Results:

Test

Melting/Freezing temperature

1

<-100°C

2

<-100°C

Mean value

<-100°C, <173 K

 

Approximate accuracy of the instrument: ± 0.5 K (up to 600K)

The values in Kelvin (K) are calculated regarding the following relation: 0°C = 273.2 K

For DSC measurement the liquid test substance is cooled with liquid nitrogen. The measurement is carried out in an atmosphere of nitrogen (30 ml/min). During the cooling step the registration of the measurement starts at +25°C with a rate of 5 K/min down to –130°C (red line) followed by heating from -130°C up to +25°C (blue line). The DSC diagrams (attached) show no melting- / freezing temperature above -100°C.

Conclusions:
A melting point value of <-100°C at 1013 hPa was determined for the substance using a relevant test method and in compliance with a known quality system (ISO 9001:2008). The result is considered to be reliable.

Description of key information

Melting point: <-20°C (EU Method A.1)

Key value for chemical safety assessment

Additional information

Two measured melting/freezing point studies are available for the registered substance. In a differential scanning calorimetry (DSC) study carried out between -150°C and 300°C, no melting point was observed; a glass transition was reported at -129°C. In addition, in a second DSC study conducted for the substance, a melting/freezing point value of <-100°C was determined for the substance in accordance with a known quality system (ISO 9001:2008). The results are used to indicate that the melting/freezing point of the registered substance is expected to be <-20°C and are thus used as weight of evidence.