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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

There is some data available for Methylcyclopentane. Data is also available for Hydrocarbons, C6, isoalkanes, <5% n-hexane; hexane; Hydrocarbons, C5-C7, n-alkanes, isoalkanes, n-hexane rich; and Hydrocarbons, C6, n-alkanes, isoalkanes, cyclics, n-hexane rich. This data is used for read across to Methylcyclopentane.


The aquatic toxicity was estimated using the Petrotox computer model (v. 3.04), which combines a partitioning model used to calculate the aqueous concentration of hydrocarbon components as a function of substance loading with the Target Lipid Model used to calculate acute and chronic toxicity of non-polar narcotic chemicals. Petrotox computes toxicity based on the summation of the aqueous-phase concentrations of hydrocarbon block(s) that represent a hydrocarbon substance and membrane-water partitioning coefficients (KMW) that describe the partitioning of the hydrocarbons between the water and organism.


Short-term toxicity to fish:

The estimated freshwater fish 96 hour LL50 is 18.27mg/L based on mortality, for Hydrocarbons, C6, isoalkanes, <5% n-hexane.


Short-term toxicity to aquatic invertebrates:

The calculated aquatic invertebrate 48-hour LC50 for Methylcyclopentane is 4.450 mg/L.


Toxicity to aquatic algae and cyanobacteria:

The calculated green algae 96-hour EC50 for Methylcyclopentane is 5.048 mg/L.


Toxicity to microorganisms:

The estimated protozoan,Tetrahymena pyriformis, 48-hr EL50 value for iso-hexane is 70.68 mg/L based on growth inhibition and the 48-hr NOEL is 15.81 mg/L for Hydrocarbons, C6, isoalkanes, <5% n-hexane.

Additional information