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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

DCPD is considered to be P but not vP.

Additional information

Exxon Biomedical Sciences (2004) is a GLP compliant, ready biodegradability study on DCPD/Codimer Concentrate, which has been read across to DCPD. The study, which follows OECD guideline 301F, showed 0% biodegradation in 28 days and therefore DCPD is considered to be not readily biodegradable.

This is supported by the results of a MITI study, used in the OECD SIDS but not available for review. The SIDS Initial assessment (1997) identified a MITI report which indicated that under aerobic conditions dicyclopentadiene (DCPD) showed 0% degradation after 2 weeks and classed the substance as not readily biodegradable.

For DCPD the Biowin 3 prediction of ultimate degradation time is 2.90 and the probabilities of fast degradation under Biowin 2 and 6 are 0.76 and 0.23 respectively, with an overall prediction of not readily biodegradable. BioHCwin V1.01 predicts the half life of dicyclopentadiene to be 21.4 days.

The results from both QSAR indicate that DCPD is expected not to be readily biodegradable. On the basis of the available data and the QSAR prediction, DCPD is considered to be P but not vP.