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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 ceramics, the alkalis in feldspar (calcium oxide, potassium oxide, and sodium oxide) act as a flux, lowering the melting temperature
of a mixture. Fluxes melt at an early stage in the firing process, forming a glassy matrix that bonds the other components of the system
together. In the US, about 66% of feldspar is consumed in glassmaking, including glass containers and glass fiber. Ceramics
including electrical insulators, sanitaryware, pottery, tableware, and tile) and other uses, such as fillers, accounted for the remainder.
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