SYMPOSIA PAPER Published: 01 January 1997

Stable Formulation of Easy Hydrolizing Actives Based on Specialty Silicas Shown on Malathion as a Modelling Substance.


There are some active ingredients (a.i.) such as phosphoresters which can be hydrolyzed by even the small amount of water available from the surface of natural carriers or synthetic silica carriers. Dry formulations, i.e. wettable powders (WP) and dispersible granules (WG), cannot be formulated with these compounds (Ferch et al. 1990). It has been shown, that the controlled hydrophobicity of the surface of a new type of carrier silica can improve the stability of such a.i., thus, enabling the formulator to produce and apply stable WP and WG.

Author Information

Oelmüller, R
Degussa AG, Hanau, Germany
Müller, A
Degussa AG, Hanau, Germany
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Developed by Committee: E35
Pages: 53–59
DOI: 10.1520/STP13833S
ISBN-EB: 978-0-8031-5378-3
ISBN-13: 978-0-8031-2469-1