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Administrative data

Endpoint:
relative self-ignition temperature (solids)
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is a solid having a melting point <= 160°C
Cross-reference
Reason / purpose for cross-reference:
data waiving: supporting information
Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Melting / freezing pt.:
ca. 80 °C
Decomposition:
yes
Decomp. temp.:
> 80 °C

An endothermic peak was observed between 50°C and 125°C directly followed by another endothermic effect starting at 125°C.

In order to investigate the nature of the first endothermic effect peak, Experiment 2 was stopped directly after this peak. After the experiment, a grey powder residue remained in the sample container (original colour: white). The change of the colour indicated possible reaction and/or decomposition of the test item in addition to potential melting transition indicated by the endotherm.

Conclusions:
It was not possible to determine precise melting temperature of mercaptamine as the melting transition could not be adequately distinguighed by the decompostion of the substance.

Data source

Materials and methods

Results and discussion

Applicant's summary and conclusion