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Environmental fate & pathways

Hydrolysis

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Description of key information

Melam is rather stable in water at environmental temperatures. A half-time of hydrolysis at 25 °C of more than 1 year was obtained.

Key value for chemical safety assessment

Half-life for hydrolysis:
1 yr
at the temperature of:
25 °C

Additional information

Less than 1 % of melam is hydrolysed in saturated buffered solutions at pH 4, 7 and 9 at 50.0 °C within 5 days. This low hydrolysis rate is considered in the EU guideline to correspond to a half-time of hydrolysis at 25 °C of more than 1 year.

A small increase of the oxytriazines as the degradation products was noticed, slightly higher for pH 9 than at pH 4 or 7.