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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:
2018-06-27 to 2018-08-02
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
1998
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Remarks:
and capillary method
Key result
Atm. press.:
1 013 hPa
Decomposition:
yes
Decomp. temp.:
> 250 °C
Sublimation:
no

The test item shows three endothermic effects in the temperature ranges of 250 °C - 280 °C, 320 °C - 360 °C and 380 °C - 450 °C in the DSC runs.

Due to the fact that none of the observed endothermic effects can be clearly associated with a melting of the test item further measurements were carried out with the capillary method.

Capillary Method

For verification of the results the test item was additionally tested three times according to the capillary method. In the three tests, the test item started to liquefy and changed its colour to brown at a temperature of approx. 340 °C. At a temperature of 350 °C, the test item was completely liquid and turned black. At a temperature of 360 °C, the test item started to climb in the capillary. At a temperature of 400 °C the test was ended.

The measurement carried out with the capillary method showed that none of the endothermic effects observed in the DSC measurements can be assigned to a melting point of the test item. Due to this result, the test item has no point.

Conclusions:
The test item TA-1 has no melting point up to its decomposition starting at approx. 250 °C as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).

Description of key information

The test item TA-1 has no melting point up to its decomposition starting at approx. 250 °C as determined by differential scanning calorimetry and capillary method according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).

Key value for chemical safety assessment

Additional information