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Physical & Chemical properties

Melting point / freezing point

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Description of key information

The melting point of high purity DCPD is 32.2°C. The melting point of commercial DCPD is <20°C, with melting points of <0°C at <85% purity, rising to 10°C at >90% purity and >30°C at 100% purity.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
32.2 °C

Additional information

The Pocket Guide presents key information and data from the US Department of Health and Human Services and as such is a reliable governmental source of information and is considered a suitable key study source for this endpoint (NIOSH 2005). This is supported by a melting/ freezing point of between 32 and 34°C from WHO ICSC (2005). No information on the primary source of the data or the methods used is available. However, this information is taken from a reliable peer reviewed database and so can be considered reliable and suitable for use.

Information on the melting/ freezing points of commercial DCPD has been taken from company specific pro-forma. For the data from DOW (2016), there is no information on the GLP status or the methods used. The melting point of commercial (94%) DCPD from proprietary data from Shell (2016) was non-GLP but conducted according to guideline ASTM D1493. The results are considered suitable for use as supporting studies for this endpoint as they are taken from company specific datasheets.