Registration Dossier
Registration Dossier
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EC number: 207-954-9 | CAS number: 502-97-6
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
melting point: 85.4°C, handbook data, no GLP, no OECD, RL2
melting point: not determinable due to solid/solid conversion/partial melting at 48°C and at 85°C, OECD Guideline 102; GLP, RL1
Key value for chemical safety assessment
Additional information
The melting point of 1,4 -Dioxane-2,5 -dione according to CRC Handbook of Chemistry and Physics (84th Ed) is 85.4°C. In a new conducted study according to OECD test guideline 102, GLP-compliant, the melting point of the test item could not be established using differential scanning calorimetry due to the appearance of two endothermic peaks. These peaks occurred at approx. 48°C and at 85°C. It was assumed that the substance undergoes biphasic melting presumably simultaneously with solid/solid conversions. The peak at 85°C was higher than that occurring at the lower temperature supporting the older measurement reported in the CRC handbook. However, since two defined peaks were detected the melting point could not be exactly determined.
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