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Physical & Chemical properties

Stability: thermal, sunlight, metals

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Description of key information

In a thermal stability study, no exothermal event was observed below the decomposition temperature. Therefore the test item 4-Hydroxy TEMPO is classified to be thermally stable at room temperature. 

Additional information

The thermal stability of 4-Hydroxy TEMPO was determined according to the OECD TG 113. Samples of the test item were weighed into glass crucibles. All samples were exposed to a temperature/time-gradient while the thermal heat-flow was recorded. All tests showed an endothermic event (melting) with an mean onset temperature of 68 °C and an exothermal event (decomposition) starting at 150 °C and lasting over a wide temperature range up to approximately 300 °C. According to the OECD Guideline 113 an exothermic event is assumed to be a decomposition. None of the results showed an exothermal event starting below 150 °C. Therefore the test item 4-Hydroxy TEMPO is classified to be thermally stable at room temperature.

Justification for classification or non-classification

Based on the study results, the substance was considered to be thermally stable at room temperature. No classification with regard to thermal stability according to Directive 67/548/EEC (DSD) and Regulation (EC) No 1272/2008 (CLP) is required.