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Environmental fate & pathways

Hydrolysis

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Description of key information

As the substance reacts with water the hydrolysis study was not performed. Based on experience with isocyanates, 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).