Since 1923, Composition Materials has supplied industries worldwide with recycled and bio-based fillers, extenders, abrasives, and non-skid additives. Specialty fillers include all-natural walnut shell products, recycled thermoset plastic fillers and aggregates, wood flour, corn cob, rice hulls, and rice hull ash. Composition Materials has been a leader in specialized fillers and abrasives and fillers for over 100 years.