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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolyses fast in water at pH 4, 7 and 9

Key value for chemical safety assessment

Half-life for hydrolysis:
25.5 min
at the temperature of:
25 °C

Additional information

Like other acid anhydrides, methacrylic anhydride was found to be hydrolytically unstable in water at pH 4, 7 and 9. The half lives (DT50) were found to be 56.4 min at pH 4 (25 °C), 25.5 min at pH 7 (25 °C) respectively 10.3 min at 37 °C and 2.29 min at pH 9. The initial hydrolysis product is methacrylic acid (Noack 2012).

This is supported by a second study, which found 92,5 % hydrolysis after 24 h at pH 1.2 and complete hydrolysis at all other pH values (pH 4, 7 and 9; Defitraces 2007).