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Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
other: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Study period:
2014
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The complete read across justification is detailed in section 13. Source study has reliability 1.
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
yes
Type of method:
thermal analysis
Remarks:
Differential Scanning Calorimetry
Decomposition:
yes
Decomp. temp.:
> 230 °C

The test item had no melting temperature between -20 °C and begin of decomposition not higher than 230 °C.

Observed thermic processes

A broad endotherme starting at about 100 °C was observed. This can be attributed to vaporization of parts of the test item. The vaporization is confirmed by the TG/DTA-measurement (non-GLP), where a weight loss of 7.3 % was found at 151 °C.

Most likely starting at about 200 °C, where the endothermic signal becomes smaller, but latest at 230 °C, where obviously an exothermic heat flow can be observed, the test item is not stable any more.

After the measurement with a final temperature of 320 °C, a weight loss of 14.9 % could be stated, but the test item did not show any visual change and it was as powdery as before. This is a clear indication, that the test item was not molten up to this temperature. Therefore, the broad endotherme with a maximum temperature of 203 °C cannot be taken as the melting of the test item.

Conclusions:
The test substance decomposes at T > 230°C before melting.
Executive summary:

Method

OECD guideline 102. Thermal analysis by DSC.

Results

Decomposition before melting at T above 230 °C.

Endpoint:
melting point/freezing point
Type of information:
other: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Remarks:
The complete read across justification is detailed in section 13. Test substance is an isomer of the substance under registration; structural difference is not expected to significantly impact physicochemical properties. Source study has reliability 2: only limited information available from a migrated NONS file, as per Article 25(3) request.
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Principles of method if other than guideline:
No information on the method used during the test is available.
GLP compliance:
yes
Type of method:
other: no available information
Melting / freezing pt.:
> 360 °C
Conclusions:
Melting point > 360 °C.
Executive summary:

Method

The test has been conducted according to EU method A.1. No other information on method is available.

Available information derives from a migrated NONS file, as per Article 25(3) request, and permission to refer is granted by ECHA.

Results

Melting point > 360 °C.

Description of key information

No melting up to T above 300 °C.  

Key value for chemical safety assessment

Additional information