MC 200K Feldspar

Alternate Names: MC 200-K Feldspar

Description: Feldspar

Oxide	Analysis	Formula
CaO	0.20%	0.02
K2O	12.80%	0.84
Na2O	1.40%	0.14
Al2O3	18.10%	1.10
SiO2	64.20%	6.59
Fe2O3	0.06%	-
LOI	0.56%	n/a
Oxide Weight		597.19
Formula Weight		600.55

Notes

Consider this as an alternative to G200 as a 200 mesh feldspar. It is very clean and exceptionally low in iron (due to their froth flotation process). 325 and even 625 mesh versions are also available, they have the same chemistry.

The company says: MC 200-K Feldspar is a high quality potassium/sodium/calcium aluminum silicate ground to 200 mesh for ceramic applications. Carefully beneficiated and controlled for quality, MC 200-K Feldspar offers high potash and low iron oxide
content per unit of alumina.

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.

Links

Typecodes	Feldspar The most common source of fluxes for high and medium temperature glazes and bodies.
Materials	Custer Feldspar The most common potash feldspar used in ceramics in North America. While having been a standard for many decades its supply appears in doubt in 2024.
Materials	G-200 Feldspar
URLs	http://www.imineralsinc.com/s/Feldspar.asp I-minerals feldspar data sheets

By Tony Hansen
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