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Minspar 200

Oxide Analysis Formula
CaO 1.50% 0.15
K2O 4.10% 0.25
Na2O 6.50% 0.60
Al2O3 18.20% 1.02
SiO2 68.80% 6.54
Fe2O3 0.07% 0.00
LOI0.30%
Oxide Weight 566.36
Formula Weight 568.06

Notes

Formerly called NC-4 Feldspar. Very similar chemistry to the no-longer-available F-4 feldspar.

A 200 mesh flotation-grade soda feldspar from Spruce Pine, NC. Used in the ceramic whiteware industry for sanitary ware, dinnerware, floor and wall tile, artware and glazes.

Physical Properties
===================
Refractive Index: 1.53
Mohs Hardness: 6.0-6.5
Mean Particle Size: 12 microns
Specific Surface Area (sq-m/g): 0.9-1.2
Dry Brightness: 94
Raw color: white
pH: 8.7
% Moisture Content: 0.1
Bulk Density (lb/cu. ft)
Loose: 44
Packed: 70
Bulk Density (kg/cu. meter)
Loose: 7.5
Packed: 1121

Particle Size: 100 140 170 200 325
% Retained tr tr 0.1 0.3 3.6
U.S. Sieve Series

*This is from a data sheet from Jan 2013

Related Information

Feldspar melts by itself to be a glaze, but crazes badly

Pure MinSpar feldspar fired at cone 6 on Plainsman M370 porcelain. Although it is melting, the crazing is extreme! And expected. Feldspars contain a high percentage of K2O and Na2O (KNaO), these two oxides have the highest thermal expansion of any other oxide. Thus, glazes high in feldspar (e.g. 50%) are likely to craze. Using a little glaze chemistry, it is often possible to substitute some of the KNaO for another fluxing oxide having a lower thermal expansion.

Old Blend Feldspar. What is that?

Laguna Clay sells a substitute for the no-longer-available G200 feldspar. G200 HP is higher in K2O and lower in CaO than G200, Minspar is an ideal addition since it's K2O is much lower and CaO much higher. A 7:3 G200HP:Minspar mix produces a chemistry that is remarkably close (on paper) to G200. They label this blend "Old Blend". They also list a product called "New Potash" in their pricelist, that is G200 HP.

Links

Materials G200 HP Feldspar
Materials G-200 Feldspar
Materials F-4 Feldspar
Materials NC-4 Feldspar
Materials Feldspar
Typecodes Feldspar
The most common source of fluxes for high and medium temperature glazes and bodies.

By Tony Hansen

Monthly Tech-Tip from Tony Hansen

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