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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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


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Administrative data

Link to relevant study record(s)

Description of key information

As the substance reacts with water the hydrolysis study was not performed. 
Based on a weight of evidence, the half-life of XDI in water is considered to be significantly less than 12 hours.

Key value for chemical safety assessment

Additional information

As the substance XDI is a diisocyanate, it reacts with water. Isocyanates hydrolyze readily in water to yield a carbamic acid, which decarboxylates to produce CO2 and an amine (XDA); the latter can immediately react with more isocyanate to yield a disubstituted urea. The hydrolysis rate increases with electron-withdrawing substituents. Steric hindrance also influences hydrolysis rate. Even at low pHs, hydrolysis Half-Life < 10 minutes (25 deg C) have been found for isocyanates (from Ullmann's Encyclopedia).