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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:
22.10. - 06.12.2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
Guideline compliant well documented study. The melting point was determined using one measurement only.
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
yes
Remarks:
one measurement only, atmospheric pressure not provided
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
yes
Remarks:
one measurement only, atmospheric pressure not provided
Principles of method if other than guideline:
The test was performed with one measurement only. The atmospheric pressure was not provided.
GLP compliance:
no
Type of method:
thermal analysis
Key result
Melting / freezing pt.:
> 1 109 - < 1 150 °C
Decomposition:
yes
Decomp. temp.:
> 940 °C
Sublimation:
yes
Subl. temp.:
> 940 °C
Remarks on result:
other: decomposition and/or sublimation was observed.

The DSC measurement was combined with a thermogravimetric (TG) measurement. The heat flow curves show a small endothermic phase change between 136 and 139 °C. Upon further heating an endothermic effect is registered starting at 1109/1129 °C (extrapolated onset), with a peak maximum temperature at 1139/1150 °C. The peak profile, however, is not reproducible and not typical for melting. Simultaneously to the endothermic heat flow a significant mass loss is observed. After cooling down, the sample crucible is covered with a black precipitation (inside and partially outside). Therefore the endothermic peak cannot only be related to melting, but also to simultaneous decomposition and/or sublimation which started at about 940 to 950 °C.

Conclusions:
The melting point is >1109°C.
Executive summary:

The melting point of Tribotecc® Ferrostar was determined with the DSC method combined with the TG method according to EU method A.1 and OECD 102 to be between 1109 and 1150°C. At about 940 to 950°C decomposition and/or sublimation started. For the risk assessment the most conservative melting point value, i.e., 1109 °C, will be used.

This melting temperature is considered to be relevant and reliable for the further risk assessment.

Description of key information

> 1109°C, decomposition and/or sublimation starts at 940°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
1 109 °C

Additional information

In the non-GLP Klimisch 1 key study (Paß 2011), the melting point of Tribotecc® Ferrostar was determined with the DSC method combined with the TG method according to EU method A.1 and OECD 102 to be between 1109 and 1150°C. At about 940 to 950°C decomposition and/or sublimation started. For the risk assessment the most conservative value, i.e., 1109 °C, will be used.

This melting temperature is considered to be relevant and reliable for the further risk assessment.