Architectural Coatings / Interior / Feldspar

Feldspar

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)
  • Whiteness

 

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)

 

Basic properties

Property Value Unit
Moisture < 0.5 [%]
Hardness (Mohs) 6 (6.5) [-]
Refractive index 1.53 [-]
L.O.I. 0.5 [%]
Density 2.6 [kg/ dm3]

 

Product overview

Product Grade D50

[µm]

D97

[µm]

OA

[g/ 100 g]

pH L*
Feldspar FF-20 6 n.d. 32 9.8
FF-30 8 n.d. 28 9.7
FF-60 19 n.d. 27 9.5
FF-150 23 n.d. 24 9.4
PG4 4 17 26 9.5 94.5
PG W7 7 25 27 8.0 97.0
PG W13 13 60 22 8.1 96.4
PG W20 20 80 19 8.2 96.2

Production locations Feldspar

 

Application

 

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.

 

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