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Environmental fate & pathways

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4,4’-Methylenedicyclohexyl diisocyanate hydrolyses rapidly in the presence of water. Hydrolysis product -, beside oligomeric and polymeric ureas - is methylene bis(4-cyclohexylamine). In water, a hydrolysis half-life for 4,4’‑methylenedicyclohexyl diisocyanate of approximately 2 hours was determined experimentally. 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.