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:
- Abrasion resistance: due to its hardness of 6 on Mohs scale, feldspar will increase the coating’s resistance to wear.
- Chemical resistance: due to its inert nature, feldspar will provide good chemical resistance compared to conventional fillers.
- Brightness: being a filler with a high brightness, feldspar (Unispar PG W) contributes to the visibility of road marking paints.
- UV resistance: being insensitive to UV radiation, feldspar will reduce the coating’s degradation.
Advantage over quartz and cristobalite: several feldspar grades are free of labelling, and can therefore be used as an alternative when fine quartz or cristobalite grades are no longer allowed.