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)
- 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).
|Refractive index||1.51 – 1.53||[-]|
Product overview Minex
[g/ 100 g]
Production location Minex
Product overview Nepheline
[g/ 100 g]
Mining locations Nepheline
Nepheline syenite will provide:
- Chemical resistance: due to its inert nature, nepheline syenite provides good chemical resistance compared to conventional fillers.
- Abrasion resistance: due to its hardness of 6 on Mohs scale, nepheline syenite will increase the coating’s resistance to wear.
- 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.
- Gloss control: with the availability of ultrafine nepheline syenite (Minex 12, Minex S-10) and a product with an optimised particle size distribution (Minex EP-315), it is possible to apply coatings with a broad range of gloss levels.
- 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.
- Stain blocking and stain resistance: nepheline syenite acts as a supporting mineral filler in stain blocking and 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.