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Physical & Chemical properties

Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
March to April 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
guideline compliant well documented study
Qualifier:
according to
Guideline:
other: OECD 102
Deviations:
yes
Remarks:
only minor
Qualifier:
according to
Guideline:
other: EU A.1
Deviations:
yes
Remarks:
only minor
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
> 515 °C
Atm. press.:
hPa
Decomposition:
yes
Remarks:
not distinguished between sublimation and decomposition
Decomp. temp.:
> 515 °C
Remarks on result:
other: Since the test material decomposed /sublimated before reaching the boiling point, no boiling point could be determined.

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. Due to the decompositon/sublimation, no boiling point could be determined.

Executive summary:

Tin disulfide decomposed/sublimated with noticeable weight loss above 515°C as observed in TGA-Analysis already before boiling and evaporating (DTG curve). Therefore a boiling point cannot be determined.

Description of key information

Due to decomposition/sublimation at temperatures > 515°C, the boiling point could not be determined.

Key value for chemical safety assessment

Additional information

In the Klimisch 1 key study, the melting point of tin disulfide was determined experimentally according to EU method A.1. The results obtained in TGA analysis demonstrated that tin disulfide decomposes/sublimates with noticeable weight loss above 515°C before melting and boiling.

Column 2 of REACH Annex VII section 7.3 states that the boiling point does not need to be measured "for solids which either melt above 300°C or decompose before boiling." Since tin disulfide decomposes/sublimites before reaching the boiling point, the boiling point was not determined.

The experiment demonstrated that the boiling point is > 515°C. For the risk assessment a worst case value of 515°C will be used.