Registration Dossier

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

MDI MT is very unstable in aqueous media and reacts with water to form predominantly high molecular weight, inert polyurea. The Heimbach study gives supporting evidence that MDI accumulation through aquatic food chains is very unlikely to happen.

Although a log Pow of 7.7 for MDI MT (idealised structure) was calculated, that value is only of theoretical interest as MDI MT is very unstable in aqueous media. MDI MT reacts with water to form high molecular weight, inert polyurea and trace amounts of hydrolysis products which contain a free NH2 -function. These findings have been taken over by read-across from MDI:

For monomeric MDI a log Pow of 4.51 was measured. MDI is very unstable in aqueous media (Yakabe et al, 1994)

and reacts with water to form high molecular weight, inert polyurea and trace amounts of 4,4'-diamino-diphenylmethane (MDA). The latter has a log Pow value of 1.55 and its measured BCF was < 14 (at 0.2mg/l) in Cyprinus carpio (EU Risk Assessment Report: 4,4'-Methylenedianiline).