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EC number: 200-609-3 | CAS number: 65-45-2
Estimated errors at 95% confidence interval. Only the monoclinic structure was observed.
138.7±0.5°C, OECD 102, DSC, Nordström 2006140.88°C, OECD 102, DSC, Weissenfeld 2010140.9°C, similar to OECD 102, DSC, Grady 1973142°C, no guideline, hotstage, sublimation observed, McCrone 1953
A very large body of experimental data exists in the literature for melting point, which is not reproduced here (see literature search). The range of melting points observed likely reflects experimental error, as well as the larger effect of different purities. Of the available literature data, a subset was selected based on the best documented reports.
A recent study conducted to ascertain the boiling point also reported the melting point, although under sub-optimal experimental conditions (Weissenfeld, 2010). This was in close agreement with an older study reporting the melting points of various pharmaceutical standards (Grady, 1973). The highest reported value (McCrone, 1953) was by the least precise technique; a hotstage measurement. The most precise (although not necessarily most accurate) measurement was that conducted by Nordström et al (Nordström, 2006), which was based on the average of 13 replicate DSC scans. This is the value (rounded) which is selected and carried forward for risk assessment, classification and labelling.
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