Architectural Coatings / Exterior / 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

Coarse Fine
product Grade D50 Name Grade D50 D90 OA
[µm] [µm] [µm] [g/ 100 g]
Silica sand M31 370 Silverbond 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 Silverbond, Silica Sand



Quartz will provide:


  • Dirt pick-up resistance: the presence of quartz improve the coating’s resistance to dirt (from the  atmosphere, for example).
  • Ease of tinting: due to the combination of refractive index, brightness and color, paints including fine quartz flour will give excellent reproducible colour results when working with tinting systems;.
  • Texture effect: usage of coarse quartz grades will ensure texture to the surface of the coating.
  • Tint retention: paints including fine quartz flour show improved tint retention over other minerals when subjected to natural weathering.
  • UV resistance and weatherability: due to its inertness, quartz supports good UV and weatherability performance to exterior architectural coatings.

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