Cristobalite is synthetically produced for industrial purposes from pure quartz in a rotary kiln at a temperature of approx. 1,500°C. A fractured grain surface, a high degree of whiteness and a density reduction to 2.35 g/cm3 is achieved by the calcination. Like quartz, cristobalite is chemically inert and is therefore popular as a filler in a variety of processes and products. Application: emulsion-bound exterior paints and renders, dental impression composites, engineered stone, silicone sealant compounds, anti-blocking additive in PP and PE film, road markings.