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:
- Dirt pick-up resistance: the presence of cristobalite improves the coating’s resistance to dirt (from the atmosphere, for example).
- Ease of tinting: due to the combination of refractive index, brightness and color, paints including cristobalite will give excellent reproducible colour results when working with tinting systems.
- Texture effect: usage of coarse cristobalite grades will ensure texture to the surface of the coating.
- Tint retention: paints including cristobalite show improved tint retention over other minerals when subjected to natural weathering
- UV resistance and weatherability: due to its inertness, cristobalite supports good UV and weatherability performance to exterior architectural coatings.
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