Cimbar Performance Minerals coarse grind series Polyfill alumina trihydrate products are used in industrial applications that require maximum loading levels. With low surface area the maximum loading levels with use of coarse grind series Polyfill products increases flame retardancy and smoke suppression with more H2O molecules available. Polyfill/PolyJet alumina trihydrate products are tightly controlled by Cimbar Performance Minerals ISO 9001:2015 quality program.