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Custer Feldspar



This is unused Custer Feldspar 200 Mesh. 

Backstory:  "Damon, Do you have interest in 7 - 2,400 lb super sacks of of Custer Feldspar.  We used it for a test material and no longer need the rest." - Tab   

Status: Tab accepted our offer, and we now have the CusterFeldspar for sale.  

Location: Dallas


Quantity: 6- 2,435 lbs. Bulk Bags

Price: $243.50 per Bag ($0.10/ lb) 

MSDS: Below


Please Call Damon with Questions- 303-321-1471 

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.