Polyfil aluminum silicates or kaolin clays are high quality, very clean, water-washed non-black fillers used in elastomeric systems. They function as semi-reinforcers or extenders. The water-washing process produces clays with less variability in pH, particle size, brightness and 325 mesh sieve residue. This uniform consistency allows for smoother extrudates, less sticking to hot metal surfaces, higher tensile and tear resistance and other benefits in rubber articles. Also, this process virtually eliminates all crystalline silica producing environmentally superior clays compared to the air-floated varieties with less health hazards related to airborne dust issues. Fine particle, high brightness, delaminated and calcined grades are available.