Nepheline Syenite

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Product Benefits
Technical Details

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

 

Minex is the brand name for the nepheline syenite used in coating applications.

 

Benefits

 

  • Dirt pick-up resistance: the presence of nepheline syenite improves the resistance of the coating towards dirt (from the atmosphere, for example).
  • Ease of tinting: due to the combination of refractive index, brightness and colour, paints containing nepheline syenite provide excellent reproducible colour results when working with tinting systems.
  • Texture effect: usage of coarse grades will provide texture to the coating surface.
  • Tint retention: paints containing 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.
  • Block resistance: with its non-stick properties, the use of nepheline syenite allows for faster stacking of coated substrates as they won’t stick together.
  • Burnish resistance: due to its hardness of 6 on Mohs scale, nepheline syenite provides good burnish resistance (low tendency to become glossy when rubbed).
  • Gloss control: the gloss level of an interior coating can be regulated by selecting the appropriate grade of nepheline syenite.
  • Scrub resistance: due to its hardness of 6 on Mohs scale, nepheline syenite improves the wet-scrub resistance of interior decorative paints.
  • Stain blocking and stain resistance: nepheline syenite acts as a supporting mineral filler in stain blocking and stain resistant coatings.
  • Abrasion and scratch resistance: due to its fairly high hardness of 6 on Mohs scale, nepheline syenite provides abrasion and scratch resistance to the coating.
  • Chemical resistance: due to its inert nature, nepheline syenite provides good chemical resistance compared to conventional fillers.
  • Clarity: due to its fairly low refractive index, nepheline syenite becomes transparent when combined with certain binder systems.
  • UV-curing compatibility: being transparent for UV radiation, nepheline syenite does not block the curing mechanism.
  • IR reflection: nepheline syenite contributes to the IR reflection of roof coatings.
  • Pore and grain filling properties (sealer): with low impact on the viscosity, nepheline syenite can be used as a mineral filler in sealers to give them more body.

 

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