Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


Hydrolysis is a reaction in which a water molecule or hydroxide ion substitutes for another atom or group of atoms present in a chemical, resulting in a structural change of that chemical. Potentially hydrolyzable groups include alkyl halides, amides, carbamates, carboxylic acid esters, lactones, epoxides, phosphate esters, and sulfonic acid esters (Neely, 1985). The lack of a suitable cleaving group renders compounds resistant to hydrolysis.


Methylcyclopentane consists entirely of carbon and hydrogen and does not contain any hydrolyzable groups. As such, it has a very low potential to hydrolyse. Therefore this degradative process will not contribute to the removal of this substance from the environment.



There is no key data available for Methylcyclopentane. Key read across data is available for a structural analogue 2-methylpentane. Additionally, supporting QSAR data for methylcyclopentane.


An OECD Guideline 301 C (Ready Biodegradability: Modified MITI) test was conducted using 2-methylpentane.The test substance was 93-94% degraded at the end of 28 days and is therefore considered to be readily biodegradable as per the strict guidelines of the OECD test. Supporting this positive results, the QSAR predictions for Methylcyclopentane also determined it to be readily biodegradable.


Adsorption / Desorption:

There is no data available for Methylcyclopentane. Based on a category-approach data are read-across to n-Hexane.


The log Koc of n-hexane was calculated to be 3.34.


Distribution Modelling:

The distribution of Methylcyclopentane in the environmental compartments, air, water, soil and sediment, has been calculated using the PETRORISK Model, version 7.04. Distribution modelling results are included in the 'Multimedia distribution modelling results' tab in the PETRORISK spreadsheet attached to Section 13 of the dossier.

Additional information