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Custer Feldspar (NaKO.Al2O3.6SiO2 ) is a one of the primary feldspars used in ceramics. It is used in both clay (up to 25%) and glaze (up to 100%) formulas and is made up of silica and alumina combined with sodium and potassium oxides. Feldspar custer is mined in Custer, South Dakota.
Custer feldspar is a widely-used potash, or potassium-bearing, feldspar. This means that the feldspar contains more potassium than sodium (as indicated by the so-called 'soda spars'). This inclusion of potassium means that Custer (along with other potash spars) melts at about 1200C, which is a bit higher than the melting temperature of soda spars. In glazing, this means that Custer feldspar is a popular choice for achieving matte glaze effects (over the glossy results one may get from soda spars).
Custer feldspar is used in many industries -- in industrial ceramics, you will find custer feldpsars used in floor and wall tile fabrication, in mass-produced dinenrware and pottery, and electrical porcelain; additionally, it is also used in the abrasives industry.
WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.