Architectural Coatings / Exterior / Nepheline Syenite

Nepheline Syenite

Nepheline syenite (silicate, naturally occurring blend of albite, microcline and nepheline) is a feldspatic mineral mined in Canada and Norway.


Nepheline syenite can be characterised by:

  • High purity
  • Absence free crystalline silica (free of labelling)
  • Brightness
  • Relatively low refractive index, making it a transparent filler in various binders
  • High inertness in various media
  • Easy wetting
  • Transparency for UV-radiation (ie. suitable for UV-curing processes).

 

Basic properties

Property Value Unit
Hardness (Mohs) 6 [-]
Refractive index 1.51 – 1.53 [-]
Density 2.6 [kg/ dm3]

 

 

 

Product overview

Product overview Minex

Product Grade D50

[µm]

Tappi

[-]

OA

[g/ 100 g]

pH

[-]

Moisture

[%]

Minex 2 13.6 85.5 26.5 10.3 0.09
3 11.0 88.0 27.0 10.3 0.09
4 7.6 88.7 30.0 10.4 0.10
7 3.5 90.0 33.0 10.4 0.16
10 2.6 90.5 35.0 10.5 0.18
12 1.5 92.0 34 10.5 0.20

Production location Minex

 

 

Product overview Nepheline

Product Grade D50

[µm]

R457

[%]

OA

[g/ 100 g]

pH

[-]

Moisture

[%]

Nepheline S4 PO 9.2 81.5 21 10.1 0.1
S6 PO 5.1 84.4 22 10.2 0.2
S7 PO 4.3 85.4 23 10.4 0.2
S10 PO 1.9 85.6 31 10.4 0.4

 

Mining locations Nepheline

 

 

Application

Nepheline syenite will provide:

 

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

 

Advantage over quartz and cristobalite and certain feldspar grades: nepheline syenite grades are free of labelling, and can therefore be used as an alternative when labelled grades of other mineral fillers are no longer allowed or wanted.

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