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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Description of key information

Koc constants:
- 1,2,3,6-tetrahydromethyl-3,6-methanophthalic anhydride (METH): Koc,n=25.52 L/Kg
- methylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (METHAc): Koc,i= 0.017 L/Kg

Key value for chemical safety assessment

Koc at 20 °C:

Additional information

The adsorption coefficients on soil of the registered substance (Koc,n: METH) and the corresponding acid (Koc,i: METHAc) were calculated according to the EPA model KOCWIN (v2.00).

It was verified, using the Log Kow method, that Koc,i < Koc,n.

According to the McCall classification scheme, both the anhydride and acid forms are very highly mobile (0 < Koc < 50) on soil.

The higher value of the anhydride form, Koc= 25.5 L/Kg, was selected with conservative approach for the environmental assessment.