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Environmental fate & pathways

Hydrolysis

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Description of key information

Tetrahydromethylphthalic anhydride (MTHPA), of which 3-MTHPA D4 is an isomer, was found to hydrolyse fast in just a few minutes (calculated half-lives) at all three temperatures tested (5, 20, 25 degree C) at pH 4, pH 7 and pH 9.

Key value for chemical safety assessment

Half-life for hydrolysis:
0.06 h
at the temperature of:
293.2 K

Additional information

Tetrahydromethylphthalic anhydride (MTHPA), of which 3 -MTHPA D4 is an isomer, hydrolyses rapidly in water to form the corresponding di-acid. Half-lives at 20 degrees C were below 3.5 minutes at pH 4, 7 and 9.