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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Bioaccumulation: aquatic / sediment

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Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

BCF (aquatic species):
2.4 dimensionless

Additional information

The log Kow of hexahydro-4 methylphthalic anhidride (4-MHHPA), determined experimentally according to the OECD 117 (HPLC method) is 2.09

The log Kow (log D) of 1,2-Cyclohexanedicarboxylic acid, 4-methyl- (4-MHHPAc), estimated at pH= 8 (environment, river) is -3.96.

All these values lie below the trigger of 3.0 and both 4-MHHPA and 4-MHHPAc are therefore expected not to exhibit significant bioconcentration or bioaccumulation tendencies.

This is supported by experimental data on the acid degradation product which indicates a low BCF of up to 2.4.