Kaolin clay material fact sheet

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Kaolin is a naturally occurring clay resulting from weathering of aluminous minerals such as feldspar with kaolinite as its principal constituent (ATTRA 2004). Kaolin is a common mineral, considered “generally regarded as safe” (GRAS) by the U.S. Food and Drug Administration. It is used as an anti-caking agent in processed foods and an additive to cosmetics, toiletries and health products. It is also used as an “inert” carrier in some pesticides, and enhances the performance of some microbial products (Rasad and Rangeshwaran 2000).

Kaolin is ground and processed further to reach a uniform particle size for application as a plant protectant. Applied in suspension in water, kaolin produces a dry white film layer of interlocking microscopic particles on the surface of leaves, stems and fruit after evaporation of the water.

Authors: 
Brian Caldwell
Authors: 
Emily Brown Rosen
Authors: 
Eric Sideman
Authors: 
Anthony M. Shelton
Authors: 
Christine D. Smart
Publisher: 
Cornell Cooperative Extension Publication
Year: 
2004