Cristobalite is a high temperature modification of silica. In contrast to silica cristobalite is rarley existent in nature. Therefore cristobalite is made out of pure silica by heating it up to 1.500°C. Through this calcining-process the lattice is expanded and the density is reduced to 2.35 g/cm³. The thereby generated air bubbles lead to a negative refractive index and an outstanding brightness. Like silica cristobalite is chemically inert. Products from medium grain sizes from 300 µm down to micronized powders with only 1m are available.
Features
• hardness 6.5 (Mohs)
• density 2.35 g/cm³
• high brightness (Y > 94)
• high chemical resistance
• thermal expansion: 54*10-6/K ( at T 20-300°C)
Key applications:
• dispersion outdoor paints and plasters
• engineered stone made of PMMA, UP
• road markings
• antiblocking-additives in PP- and PE-films
• dental casting material
• silicone sealants
• precision casting
High Performance Fillers based on cristobalite:
SILBOND® / SIKRON® / SILMIKRON®