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Nepheline Syenite

Nepheline Syenite is an anhydrous sodium potassium aluminium silicate. This material has a big advantage over feldspar: It does not contain quartz.

Nepheline Syenite has been a standard in the ceramic industry for many years, and is very popular for the whiteness it imparts to clay bodies. Nepheline syenite melts lower than feldspars.

Like feldspar, nepheline syenite is used as a flux in tile, sanitary ware, porcelain, vitreous and semi-vitreous bodies. It contributes high alumina without associated free silica in its raw form and fluxes to form silicates with free silica in bodies without contributing free silica itself. This stabilizes the expansion curve of the fired body. It is an excellent tile filler and melter, especially for fast firing. Nepheline syenite is valuable in glass batches to achieve the lowest melting temperature while acting as a source of alumina.

Nepheline Syenite

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