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G200 Old Blend Feldspar

Alternate Names: MFEL S3470 Blend

Oxide Analysis Formula
Al2O3 18.20% 1.00
CaO 1.00% 0.10
Fe2O3 0.08% -
K2O 10.50% 0.63
Na2O 3.00% 0.27
SiO2 66.80% 6.26
LOI 0.20%n/a
Oxide Weight 560.45
Formula Weight 561.58


To be as similar as possible to the old G-200 feldspar, Laguna Clays blended 3 parts Minspar and 7 parts G-200 HP to produce this material.
However G-200HP was then discontinued so Laguna Clays began importing Mahavir Feldspar from India.

Related Information

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.


Materials G-200 Feldspar
Materials G200 HP Feldspar
Materials Mahavir Potash Feldspar
Materials G-200 EU Feldspar
Typecodes Feldspar
The most common source of fluxes for high and medium temperature glazes and bodies.
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