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 Minex S

Product Grade D50

[µm]

R457

[%]

OA

[g/ 100 g]

pH

[-]

Moisture

[%]

Minex S-4 9.2 81.5 21 10.1 0.1
S-6 5.1 84.4 22 10.2 0.2
S-7 4.3 85.4 23 10.4 0.2
S-10 1.9 85.6 31 10.4 0.4

 

Mining locations Minex S

 

 

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.


Warning: Use of undefined constant php - assumed 'php' (this will throw an Error in a future version of PHP) in /home/sibelcot/sites/coatings/wp-content/themes/sibelco/template-parts/functionalitiesSubMineral.php on line 66

Sibelco © 2020