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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

Experimental results were identified for the three trophic levels (algae, invertebrates, and fish) with variable reliability. Key studies and supporting studies are included in this report. A weight of evidence approach has been taken for both the short term toxicity to fish and short term toxicity to algae and cyanobacteria. The following sections detail the robust summaries prepared for these studies in the appropriate sections. The selected key study is also highlighted in the discussion.


The lowest acute result was for aquatic invertebrates. A new proprietary study conducted under GLP and to guideline has been used as the key study for this endpoint. The study gives a 48 hour EC50 value of 0.823 mg/L. Although a lower result is available for this endpoint, this is taken from a study with no analytical confirmation of the test concentrations and therefore the new proprietary study is considered more robust. The use of the lower result would not change the classification applied or the exposure assessment.


None of the studies evaluated exceed the acute LC50 toxicity (T) screening criteria of <0.1 mg/L. A further evaluation of the data on the basis of the available NOECs indicates that the criteria in Annex XIII of <0.01 mg/L for toxicity to aquatic organisms (fresh and marine) is not exceeded. These values indicate that the toxicity criteria stipulated in Annex XIII would not be met. Therefore, dicyclopentadiene is not considered to be T within the PBT assessment on the basis of the screening criterion and there is evidence that the criterion stipulated in Annex XIII is also not met.