Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Endpoint summary

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Description of key information

Additional information

Data on physical properties were obtained from a number of proprietary and secondary sources. The data in the secondary sources are based on a critical evaluation of peer-reviewed data and the selected values are considered to be reliable and representative of the property under investigation. Information on the review process was documented in the introduction of the source. The use of Klimisch codes (Klimisch et al. 1997) was extended to these secondary sources and a reliability code of (2) valid with restrictions was assigned when using the authoritative secondary source. The data in the proprietary sources are taken from non-GLP, company specific datasheets, either with or without test guidelines. Although there is limited data available, as the results have been taken from company pro-forma, they have been assigned a reliability code of (2) reliable with restrictions and are considered suitable for use as supporting studies for the physico-chemical endpoints.

High purity DCPD is a crystalline solid at ambient temperature, whilst commercial DCPD is a liquid. Therefore, physico-chemical data are presented, where available for both the pure (solid) and impure (liquid) forms of DCPD. The melting point of DCPD varies with the purity of the sample, with melting points of <0°C at <85% purity, rising to 10°C at >90% purity and >30°C at 100% purity.

For (eco)toxicity, since DCPD is dissolved in aqueous media or a hydrophobic vehicle such as corn oil, differences in test results between the two forms are not expected and observed. Additionally, it is expected that the mammalian hazards associated with DCPD would differ between the different forms of the substance. Most of the studies included in the dossier have been performed using a high-purity stream of DCPD. Exposure assessments have been performed with the substance as a liquid, as this is the most conservative approach.

DCPD is a liquid or low melting point solid, depending on the purity of the substance, and therefore the flammability classification has been based on the flash point of the substance in combination with its boiling point. DCPD has a harmonised classification as Flammable Liquid Category 2 under CLP. High purity DCPD has coincident melting and flash points at 32°C and a boiling point of 172°C. Commercial DCPD has a melting point of <0°C to >30°C depending on the purity, a flash point of >23°C and a boiling point of 80 -190°C. Therefore, as both high purity and commercial DCPD have flash points of between 23°C and 60°C, a self-classification of Flammable Liquid Category 2 Flammable liquid and vapour would be indicated by the CLP criteria.