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Minspar 200

Soda Feldspar

Oxide Weight566.36
Formula Weight568.06
If this formula is not unified correctly please contact us.

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

Old Blend Feldspar. What is that?

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.

Feldspar melts by itself to be a glaze? Hold on!

Feldspar melts by itself to be a glaze? Hold on!

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.

Out Bound Links

In Bound Links

By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Minspar 200" descrip="Soda Feldspar" searchkey="" loi="0.00" casnumber="12168-80-8"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="1.500" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="4.100" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="6.500" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="18.200" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="68.800" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.070" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="0.300" tolerance=""/> </volatiles> </material>

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