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Boiling point

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boiling point
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 which decomposes before boiling

Description of key information

The study does not need to be conducted because the substance decomposes before boiling.

Key value for chemical safety assessment

Temperature of decomposition (state purity):
300 °C

Additional information

The main supporting study (BASF, 1983) was performed equivalent to OECD Guideline 103 using differential thermal analysis (DTA) and was classified as Klimisch 2. Hence, the results can be considered as reliable. However, the nature of the test method does not allow to differentiate between boiling point and decomposition temperature, so cannot be clearly determined whether the subsequent exothermal reaction with a maximum at 300 °C (starting at 250 °C) is attributed to boiling or decomposing. Hence, two additional supporting values were taken from peer-reviewed databases. Here, it is stated clearly that the compound decomposes at 302-305 °C (GESTIS, 2013) resp. 305 °C (HSDB 2013 / Lide DR, 1994), which allow to draw the conclusion that the examined exothermal reaction was attributed to decomposition rather than boiling.

All three additional supporting studies were classified as Klimisch 2, and the results can be generally considered to be reliable. Furthermore, all values are in the same small range (300 °C – 305 °C), which can be easily explained by the possible presence of minor impurities, differences due to different determination methods or generally by a certain margin of error accompanying all experimental determinations.

Hence, the results are consistent and only the decomposition temperature could be determined and denoted in IUCLID, but not the boiling point. This in in congruence with REACH Annex VII section 7.3 Column 2 stating that the boiling point does not need to be determined if the substance decomposes before boiling. So, no datagaps were determined, no further testing is required and the decomposition temperature of ca. 300 °C can be used for risk assessment.