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

Notes

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?

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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	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.

By Tony Hansen
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