Architectural Coatings / Interior / 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:

 

  • Block resistance: the use of nepheline syenite allows faster stacking of coated substrates with the substrates sticking to each other.
  • Burnish resistance: due to its hardness of 6 on Mohs scale, nepheline syenite 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 nepheline syenite will provide excellent reproducible 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 nepheline syenite.
  • Scrub resistance: due to its hardness of 6 on Mohs scale, nepheline syenite improves wet-scrub resistance of interior decorative paints.
  • Stain resistance: nepheline syenite acts as a supporting mineral filler in stain resistant 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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