Industrial Coatings / Wood Coatings / Quartz


Quartz (silica, SiO2) is the core mineral within the Sibelco group and can be found in a broad number of applications, such as glass, ceramics and coatings. Quartz can be characterised by:


  • Relatively high Mohs hardness of 7
  • Low electrical conductivity
  • Easy to wet
  • High inertness in various media
  • Shape (depending on the source, quartz particles can have an angular or more rounded shape).


Note when using quartz:

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


Basic properties

Property Value Unit
Moisture [%]
pH 7 [-]
Hardness (Mohs) 7 [-]
Refractive index 1.55 [-]
Colour (D65/ 10°) L* 93 – 96 [-]
L.O.I. < 0.3 [%]
Density 2.65 [kg/ dm3]


Product overview

product Grade D50 Grade D50 D90 OA
[µm] [µm] [µm] [g/ 100 g]
Silica sand M31 370 M6 30 95 16.5
M32 260 M10 23 60 17.5
M34 170 M300 17 40 19
M400 12 26 20
M500 4 10 23
M600 4 9 24
M800 1.8 4.1 32

Production locations Silica Sand



Quartz will provide:


  • Chemical resistance: due to its inert nature, quartz will provide good chemical resistance compared to conventional fillers.
  • Abrasion resistance: due to its hardness of 7 on Mohs scale, quartz will increase the coating’s resistance to wear.
  • Clarity: due to its fairly low refractive index, fine quartz products become transparent when combined with certain binder systems.
  • Gloss control: with the availability of ultrafine and medium size quartz flour grades, it is possible to apply coatings with a broad range of gloss levels.
  • Pore and grain filling properties (sealer): with low impact on the viscosity, quartz can be used as a mineral filler in sealers to give them more body.
  • Stain resistance: quartz acts as a supporting mineral filler in stain resistant coatings.


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