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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:
25.11. - 30.11.2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Guideline compliant well documented study 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:
In a measurement with differential scanning calorimetry a sample of the test item and a reference material (identical crucible without the test item) are subjected to the same controlled temperature program. The difference in the temperatures of the test item and the reference material is recorded and applying a calibration function converted to a heat flow signal. When the sample undergoes a transition involving a change in enthalpy (endothermic on melting), that change is indicated by a departure from the base line of the heat flow record.
The test ws performed with one measurement only and the atmospheric pressure not provided. These deviations are considered not relevant for the outcome of the study.
GLP compliance:
no
Type of method:
thermal analysis
Key result
Melting / freezing pt.:
> 515 °C
Decomposition:
yes
Decomp. temp.:
> 515 °C
Sublimation:
yes
Subl. temp.:
> 515 °C
Remarks on result:
other: It was not determined if decomposition and/or sublimation was observed.

The DSC measurement was combined with a thermogravimetric (TG) measurement. The heat flow curve shows a larger endothermic effect starting at 560 °C (extrapolated onset) with peak maxima temperatures at 623 and 677 °C. Simultaneously to the endothermic heat flow, however, a significant mass loss is observed. After cooling down, the sample holder, the reference crucible as well as the sample crucible are covered with a grey precipitation (sample crucible inside and outside). As residue remains a dark-grey powder. Therefore the endothermic peak cannot be related to melting, but to decomposition and/or sublimation. No melting point was determined prior to the decomposition and/or sublimation of the test item, starting at approx. 515 °C.

Conclusions:
The melting point is >515°C.
Executive summary:

The melting point of tin disulfide was determined with the DSC method combined with the TG method according to EU method A.1 and OECD 102 to be above 515°C. Above this temperature decomposition and/or sublimation was observed. For the risk assessment the most conservative value, i.e., 515 °C, will be used.

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

Description of key information

> 515°C, decomposition and/or sublimation starts at 515°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
515 °C

Additional information

In the non-GLP Klimisch 1 key study (Paß 2011), the melting point of tin disulfide was determined with the DSC method combined with the TG method according to EU method A.1 and OECD 102 to be above 515°C. Above this temperature decomposition and/or sublimation was observed. For the risk assessment the most conservative value, i.e., 515 °C, will be used.

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