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 (Unispar FF)
- Low fine crystalline silica fraction (no labelling) (Unispar PG (W))
- Whiteness (Unispar PG W).
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 Unispar
Feldspar will provide:
- Ease of tinting: due to the combination of refractive index, brightness and color, paints including feldspar will give excellent reproducible colour results when working with tinting systems.
- Texture effect: usage of coarse feldspar 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, feldspar supports good UV and weatherability performance to exterior architectural coatings.
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