Skip to main content

Cristobalite—synthesized from quartz


Cristobalite is a high-temperature modification of quartz and, in contrast to quartz, its occurrence in nature is very seldom. For this reason, 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.


  • hardness of 6.5 (Mohs)
  • low density of 2.35 g/cm³
  • high degree of whiteness (colour value Y > 94)
  • high chemical resistance
  • fractured surface
  • thermal coefficient of expansion: 54*10-6K-1 (at a temp. of 20–300°C)

Main applications

  • emulsion-bound exterior paints and renders
  • dental impression composites
  • engineered stone made from PMMA, UP
  • silicone sealant compounds
  • anti-blocking additive in PP and PE film
  • road markings

Through non-ferrous milling and screening processes Quarzwerke is in a position of being able to make micronized cristobalite powders with a medium granularity of up to 1 µm.

Our cristobalite flours and powders are available uncoated under the trade name SIKRON®. The silanised types are available under the trade name SILBOND®.

We can therefore guarantee that we have the optimal solution for your application!