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EC number: 215-252-9 | CAS number: 1315-01-1
Boiling point
Administrative data
Link to relevant study record(s)
- 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
- Guideline:
- other: OECD 102
- Deviations:
- yes
- Remarks:
- only minor
- Qualifier:
- according to guideline
- 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.
- 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.
Reference
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.
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.
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