Feldspars are used as fluxing agents, to form a glassy phase at low temperatures, and as a source of alkalies and alumina in glazes. They improve the strength, toughness, and durability of the ceramic body crystalline phase of other ingredients, softening, melting and wetting other batch constituents.
In the flooring sector, feldspar is the main constituent in the body composition. It is used as a flux, lowering the vitrifying temperature of a ceramic body during firing and forming a glassy phase. Surface tension pull the remaining solid particles together, giving a densification of the ceramic body.
tableware, feldspar gives a good fusibility for a product without defects.
sanitaryware , the use of feldspar within vitreous ceramic bodies is used here to illustrate this optimisation process.