Nepheline Syenite
Mineral: Nepheline syenite (silicate, naturally occurring blend of albite, microcline and nepheline).
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 (i.e. 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 Nepheline
Product | Grade | D50
[µm] |
R457
[%] |
OA
[g/ 100 g] |
pH
[-] |
Moisture
[%] |
Nepheline | S7 PO | 4.3 | 85.4 | 23 | 10.4 | 0.2 |
S10 PO | 1.9 | 85.6 | 31 | 10.4 | 0.4 |
Production location: Stjernoy (NO)
Application
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.
Functionalities: Mechanical reinforcement, Durability