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EC number: 215-252-9
CAS number: 1315-01-1
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
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.
Due to decomposition/sublimation at temperatures > 515°C, the boiling point could not be determined.
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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