Cimbar Performance Minerals medium grind series Polyfill alumina trihydrate products are specially produced for thermoset plastic and CASE applications that require high loading levels with increased surface area for improved flow and surface finish properties. The increased loading levels with use of medium 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.