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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

PACM (4,4’-methylenebis(cyclohexylamine) is soluble in water (12.3 g/L) and is poorly degraded in water (neither readily biodegradable nor inherently biodegradable). It undergoes rapid photo transformation in the atmosphere (half-life of 3.3 h; at 0.5E-06 molecules OH/cm³, 24 h daylight).


The substance will not evaporate into the atmosphere from the water surface based on the pH-corrected Henry's Law constant of 3.65E-8 Pa m³/mol at pH 7 (range pH 5 to 9: 3.65E-10 to 3.63E-06 Pa m³/mol; BASF, 2012).


 


The Koc for PACM was calculated for the environmentally relevant pH range according to Franco and Trapp (2008, 2009, 2010). This resulted in a log Koc of 4.25 at pH 5 to 8 (Koc = 17958 at pH 5 to Koc = 17781 at pH 8). Therefore, adsorption to solid soil phase is expected.


 


The BCF value indicates that PACM has a low potential for bioaccumulation in aquatic and terrestrial habitats; the bioconcentration factor was estimated as BCF <100. 


According to a Mackay Level I (static equilibrium) fugacity calculation, the main target compartments for PACM (as uncharged molecule) will be the hydrosphere (98.3 %), followed by sediment and soil (0.85 % each) and air (0.032 %). Assuming equal emissions to the air, water and soil compartments, a Mackay Level III (dynamic steady-state) fugacity calculation predicted a distribution of 80.5 %, 19.1 %, 0.3 % and 0.06 % to the soil, water, sediment and air compartments, respectively.