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Environmental fate & pathways

Hydrolysis

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Description of key information

Methylparaben is resistant to hydrolysis in hot and cold water.
Above pH7, appreciable hydrolysis occurs, producing p-hydroxy benzoic acid (PHBA) and methanol.
In strongly alkaline solutions, methylparaben hydrolyzes to the corresponding carboxylic acid, which then becomes ionized.
The rate of hydrolysis is pH-dependent.

Key value for chemical safety assessment

Additional information

According to the adaptation criteria specified in column 2 of annex VIII of the REGULATION (EC) No 1907/2006 Annex VIII, 9.2.2.1. (Hydrolysis as a function of pH) a study does not need to be conducted if the substance is readily biodegradable. This substance is readily biodegradable (see chapter 5.2.1) and therefore the study is not required.

However, available information from a literature source is provided.