Cristobalite (silica, chemical formula SiO2) is the result of the calcination of quartz at a temperature of 1500°C:
Cristobalite can be characterised by:
- High brightness
- Relatively high Mohs hardness of 6.5
- Relatively low refractive index, making it a transparent filler in various binders
- Easy wetting
- High inertness in various media
- Transparency for UV-radiation (ie. suitable for UV-curing processes).
Note when using cristobalite: depending on the particle size distribution of the product, it can be labelled (STOT RE 2 or STOT RE 1). For more detailed information, visit www.safesilica.eu.
|Colour (D65/ 10°) L*||98||[-]|
(1): Tamisé: > 500 µm = < 1%
Production locations Sibelite
Cristobalite will provide:
- Burnish resistance: due to its hardness of 6.5 on Mohs scale, cirstobalite provides good burnish resistance (low tendency to become glossy when rubbed)
- Ease of tinting: due to the combination of refractive index, brightness and color, paints including cristobalite will provide excellent reproducible colour results when working with tinting systems.
- Gloss control: the gloss level of an interior coating can be influenced by selecting the appropriate grade of cristobalite
- Scrub resistance: due to its hardness of 6.5 on Mohs scale, cristobalite improves wet-scrub resistance of interior decorative paints
- Stain resistance: cristobalite acts as a supporting mineral filler in stain resistant coatings.