Anglo Pacific Minerals Nepheline Syenite - Glass Grade APGlas 20

• Nepheline Syenite 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 syenites a composed of three primary minerals: the albite form (sodium) of feldspar, the microcline form (potassium) of feld,spar 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.

In glass application, nepheline syenite primarily serves as an excellent fluxing agent and has the following advantages:

• Higher alumina content which improves matrix formation, stabilization and physical resistance
• Higher alkali volume and improves fluxing, which lowers the melting temperature of the batch and reduces the quantity of high cost soda ash to be added
• Higher alkali/alumina ratio and lower fusion, which increase savings in raw materials handling, storages and energy used in production
• No free silica

Glass