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MC Na-200 Feldspar

Alternate Names: NA200, MC NA 200

Oxide Analysis Formula
SiO2 64.84% 5.55
Al2O3 20.71% 1.04
Fe2O3 0.06% 0.00
CaO 1.82% 0.17
Na2O 6.49% 0.54
K2O 5.20% 0.28
BaO 0.33% 0.01
Oxide Weight 511.38
Formula Weight 513.43


The company was introducing this January 2007 and claimed: "A high quality sodium/potassium/calcium aluminum silicate, ground to 200 mesh for ceramic applications. Carefully beneficiated and controlled for quality, it offers a high alkali content and low iron oxide content per unit of alumina."
Cone 11 fired flow tests beside MC K-325 show this to melt much better even though it is a larger particle size. It also melts much better than Custer or G-200 and the melt flow is whiter than G-200 and much whiter than Custer.

Related Information

Feldspars, the primary high temperature flux, melt less than you think.

A cone 8 comparative flow tests of Custer, G-200 and i-minerals high soda and high potassium feldspars. Notice how little the pure materials are moving (bottom), even though they are fired to cone 11. In addition, the sodium feldspars move better than the potassium ones. But feldspars do their real fluxing work when they can interact with other materials. Notice how well they flow with only 10% frit added (top), even though they are being fired three cones lower.


Materials Potash Feldspar
Materials Soda Feldspar
Typecodes Feldspar
The most common source of fluxes for high and medium temperature glazes and bodies.


Bulk Density lbs/cu. ft. (Packed)90
Sieve Analysis Dry+140 mesh: 0.5 max +200: 1.5 max +325: 10.0 max

By Tony Hansen

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