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:
- Abrasion and scratch resistance: due to its fairly high hardness of 6.5 on Mohs scale, cristobalite provides abrasion and scratch resistance to the coating.
- Chemical resistance: due to its inert nature, cristobalite will provide good chemical resistance compared to conventional fillers.
- Brightness: being one of the fillers with the highest brightness, cristobalite contributes to the visibility of road marking paints.
- Skid resistance: coarse cristobalite grades will give a roughness to the substrate, making it less slippery in general and in wet conditions, and providing better visibility in wet conditions.
- UV resistance: being insensitive to UV radiation, quartz will reduce the coating’s degradation.