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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolysis half-life: 23 min at pH 7, 2 min at pH 4, 5 min at pH 9 and 25°C

Key value for chemical safety assessment

Half-life for hydrolysis:
0.38 d
at the temperature of:
298 K

Additional information

Hydrolysis half-lives and rate constants at pH 4, 7 and 9 and 10, 25 and 35°C were determined in a reliable study conducted according to OECD 111, and in compliance with GLP (SEHSC 2004)

The initial hydrolysis product is 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol.

The supporting study (Spivack 1994) determined that 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol hydrolyses to an equilibrium mixture in which dimethylsilanediol dominates at environmentally significant rates, even at concentrations orders of magnitude above those found in the environment.