Expanded perlite is recommended as a carrier for pesticides, feed concentrates, herbicides, and other similar applications. As a carrier for feed concentrates, perlite will readily adsorb the concentrate while remaining free flowing (anti caking), and chemically resistant to microbiological degradation. The perlite also permits quick liquid movement between the carrier surface and the recipient of the feed concentrate.
Perlite has been approved in the past by organizations like the Association of American Feed Control Officials. It also has been approved to be used in the processing and filtration of both animal and human food, and is included in the Food Chemicals Codex 2nd Edition, Second Supplement. In the Food Chemicals Codex, perlite was approved for use as a filter aid or pressing aid in the processing of foods and feed ingredients, and also as an anti-caking agent.