SYMPOSIA PAPER Published: 01 December 2011

WG and WP Formulations of Captan with Polymeric Surfactants


Water-dispersible Granules (WGs) and Wettable Powder (WP) are two important types of agrochemical formulations. The combined shares of WG and WP formulations by volume were 30 % among all the agrochemical formulation types in 2007. WG formulation is continuously increasing in share as a safer and greener formulation type. Both formulation compositions and formulation process affect the performance of WG and WP. This research demonstrated a concise and systematic approach to develop WG via low pressure extrusion process and WP blade-mixer blending process in the laboratory. Specifically, Captan technical as a model active ingredient was formulated together with polymeric dispersants, alkyl sodium sulfosucci-nate wetting agents, and Kaolin clay diluents under controlled process conditions. The formulated samples were investigated in suspension stability, disintegration behavior, particle size, and granule morphology, and their composition-structure-performance relationships were discussed.

Author Information

Hu, Qiang
Croda, Inc., New Castle, DE, US
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Developed by Committee: E35
Pages: 72–91
DOI: 10.1520/STP153720120006
ISBN-EB: 978-0-8031-9013-9
ISBN-13: 978-0-8031-7523-5