Filtration is the separation of solids from liquids by forcing the liquid to flow through a porous medium and depositing the solids on the medium. A filter aid is a finely divided material which, when added to the liquor to be filtered, helps control flow and solids removal.
Dicaperl is a family of lightweight, hollow glass bubble fillers produced and marketed worldwide by Grefco, Inc. Available in a variety of particle size ranges, with or without surface modifications, Dicaperl is a very cost effective density reducing filler for any resin/binder system.
Chemrock Cryogenics is an international manufacturer of Expanded Perlite products.