Cristobalite: Pure whiteness


Cristobalite is a high-temperature modification of quartz. Unlike quartz, it occurs only very rarely in nature. For this reason, cristobalite for industrial uses is manufactured synthetically by subjecting pure quartz to temperatures of approx. 1500°C in a rotary kiln. Calcination produces a jointed grain surface, a high degree of whiteness and a reduction in density to 2.35 g/cm3. Cristobalite, like quartz, is chemically inert.  Using a combination of iron-free grinding and optical technologies, Quarzwerke is capable of producing highly refined cristobalite powders with particle sizes of 1μm. 

• hardness of 6.5 (Mohs)
• low density of 2.35 g/cm3
• high brightness (Y-value > 94)
• high chemical resistance
• thermal expansion: 54*10-6 K-1 (at T 20-300°C)

Key applications
• dispersion paints and plasters
• dental casting material
• engineered stone made of PMMA, UP
• silicone sealants
• antiblocking-additives in PP- and PE-films
• road markings 

  • Vertrieb / Sales - HPF The Mineral Engineers
  • fon +49 (0) 2234 101-415