SODIUM FELDSPAR

Sodium Feldspar, also known as Soda Feldspar, is generally a clean white mineral that sources sodium, alumina and silica along with some potassium and calcium. No actual materials have the ideal formula shown here, they all have some K2O and small amounts of other contaminants.

Sodium Feldspar is a common raw material used in Glassmaking, Ceramics, and to some extent as a filler and extender in Paint, Plastics, and Rubber in Glassmaking. Alumina from Feldspar improves product hardness, durability, and resistance to chemical corrosion.

In ceramic bodies, the main vitrifying (fluxing) agent is feldspar. The majority of whiteware bodies contain good proportions of feldspar. It acts as a flux. 

In the ceramic industry, the flux is defined as that portion of the body which develops the glass phase. It’s provided mostly by feldspar. 

The amount of flux in a ceramic body should be only in such a proportion as to develop the desired amount of vitrification. If excess flux is added, the fired body becomes very glassy and consequently, brittle.