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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Additional information

4,4’-Methylenedicyclohexyl diisocyanate hydrolyses rapidly in the presence of water. A half-life for 4,4’‑methylenedicyclohexyl diisocyanate of approximately 2 hours was determined experimentally. Main hydrolysis product – beside a majority of oligomeric and polymeric ureas - is methylene bis(4-cyclohexylamine). Due to the rapid hydrolysis of 4,4’-methylenedicyclohexyl diisocyanate, equilibrium partitioning of the substance between environmental compartments is unlikely. Consequently, a calculation of the Henry’s Law Constant and of the distribution between the environmental compartments according to the Mackay fugacity model level 1 is not suitable.

4,4’-Methylenedicyclohexyl diisocyanate degrades relatively rapidly in the atmosphere by reaction with hydroxyl radicals (half-life, 15 hrs), and may also undergo hydrolysis. The photochemically induced half life of the hydrolysis product methylene bis(4-cyclohexyldiamine) is 3hours. Both half-lives correspond to an OH concentration of 0.5 x 106 OH radicals/cm³, which is a typical 24 hour-mean in Central Europe.