Nepheline Syenite

Nepheline syenite has three main areas of application;
- Ceramics
- Functional fillers
- Glass production

It is a naturally occurring, silica-free, anhydrous sodium-potassium alumina silicate, that delivers improved product performance and is accordant with modern environmental and industrial hygiene standards.

Nepheline syenite is a composed of three primary minerals: the albite form (sodium) of feldspar, the microcline form (potassium) of feldspar and nepheline (feldspathoid).

The existence of nepheline and the absence of crystalline silica is what sets this uniquely occurring rock apart from feldspar fillers, which contain just albite and microcline.

Like feldspar, it provides alkalis that act as a flux in the manufacture of glass and ceramics. In glass production, alumina acts as a matrix of stabilizer, enhancing the workability of molten glass, and increasing the resistance for scratching, breaking and chemical protection.

Ceramic Grade

AP Cer is our ceramic-grade nepheline syenite product, which are naturally occurring, quartz-free, alkaline alumina silicate.
In ceramic application, nepheline syenite primarily serves as an excellent fluxing agent and has the following functions:
‣ significantly lowers melting point, and speeds up firing process
‣ increases body vitrification over a wide range of firing temperature
‣ improves absorption and moisture expansion improves mechanical strength
‣ increases thermal expansion and reduces variations of thermal expansion during production


Chemical Properties

AP Cer
SiO2~ 61.00%
Al2O3~ 21.00%
Fe2O3~ 0.11%
TiO2~ 0.05%
Na2O~ 10.00%
K2O~ 6.00%
CaO~ 1.00%
MgO~ 0.05%
L.O.I.~ 2.10%

Particle Size Distribution

+45µm (325 Mesh)< 5.00%
D50 (µm)~15.0µ
Moisture< 0.3%
Fused Whiteness~46
Melting Point~1200℃

Please note, other grades and specifications are available upon request.

Download Spec. Sheet