Feldspar (silicate, chemical formula Na(AlSi3O8), where Na can also be replaced by K) is one of the main constituents of the Earth’s crust. Feldspar can be characterised by:
- Relatively high Mohs hardness of 6
- Low electrical conductivity
- Easy to wet
- High inertness in various media.
And, depending on the grade:
- Low content of lamellar mica
- Low fine crystalline silica fraction (no labelling)
Note when using feldspar: depending on the particle size distribution of certain products, they can be labelled STOT RE 2. For more detailed information, visit www.safesilica.eu.
Sibelco feldspar quarry in Cine (Turkey)
|Hardness (Mohs)||6 (6.5)||[-]|
[g/ 100 g]
Production locations Feldspar
Feldspar will provide:
- Burnish resistance: due to its hardness of 6 on Mohs scale, feldspar 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 feldspar will provide excellent reproducable 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 feldspar.
- Scrub resistance: due to its hardness of 6 on Mohs scale, feldspar improves wet scrub resistance of interior decorative paints.
- Stain resistance: feldspar acts as a supporting mineral filler in stain resistant coatings.