They do not impart taste, odor or color and are listed in the U.S. Food Chemicals Codex published by the National Academy of Sciences. This publication, which is a source of information on the quality and purity of food grade substances, is officially recognized by the U. S. Food and Drug Administration and has been adopted by many government agencies throughout the world. A unique benefit to manufacturers using perlite filter aids in food processing is that spent filter cake is used as a component in animal feed in many countries throughout the world. This reduces spent filter cake disposal costs. Worldwide Availability Perlite filter aids are available throughout the world.
Any manufacturer desiring to use the product can usually obtain it packaged in bags or in bulk.
In the past 30 years, perlite filter aids have gained acceptance in almost every industry concerned with the separation of liquids and solids. The following list, although not all-inclusive, should give an indication of the many applications where perlite filter aids are being used.