Monthly Tech-Tip from Tony Hansen SignUp

No tracking! No ads!That's why this page loads quickly!

1-9 | A | B | C | D | E | F | Frits | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Mahavir Potash Feldspar

Alternate Names: PF-01 Potassium Feldspar, PF-01 Potash Feldspar, Mahavir Feldspar

Oxide Analysis Formula
MgO 0.15% 0.02
Fe2O3 0.08% 0.00
CaO 0.15% 0.02
Na2O 3.00% 0.27
K2O 11.50% 0.69
Al2O3 17.50% 0.97
SiO2 67.00% 6.30
Oxide Weight 561.90
Formula Weight 564.73


This feldspar is being imported by Laguna Clay into North America (from India). It will be marketed as the successor to G-200 feldspar and its temporary substitute, the MFEL S3470 blend (Minspar/G-200HP blend). The chemistry of this is very similar to G-200 (this has a little more K2O, a little less Al2O3 and a little more SiO2).

The manufacturers data sheet describes it as a selected white firing high grade potassium feldspar typically used in frits, ceramic glazes, sanitary ware, table ware, white glass, TV tubes etc. The data sheet calls it PF-01 Potassium Feldspar so there is some confusion about what it will be called.

The analysis supplied here has been rationalized from that supplied on the manfacturers data sheet. It specifies plus or minus values for oxides as follows:
SiO2 +/- 1%
Al2O3 +/- 0.5%
K2O +/- 1%
Na2O +/- 0.5%
CaO < 0.3%
Fe2O3 +/- 0.02%
MgO < 0.3%
TiO2 < 0.01%
LOI 1% max

Mineralogy: 65-75% Microcline
21-30% Albite
0.6% Anorthite
1% Kaolinite
10-15% Quartz

Melting temperature: 1220C (soaking time 30 minutes)
Particle size: 2% +63 microns (the data sheet lists others but this is the one being imported by Laguna Clay)

Related Information

Original container bag of Mahavir Feldspar

A nylon fabric bag with no safety markings.

Another new substitute for G-200 feldspar in North America will be importing this material from India. It will be called Mahavir Potash Feldspar. You can find it in the reference materials in your account. You might like to leave recipes as is (naming G-200 as the material) but insert "Mahavir Potash Feldspar" as the lookup so the chemistry will be correct.

Which common American/Canadian feldspars can substitute for each other?

After comparing the chemistries of an original feldspar and a tentative substitute, these melt flow tests are an excellent way to confirm physical similarity also. These were done at cone 6 (2200F). Each feldspar is mixed with 15% Ferro Frit 3195. Some things to note: Nepheline Syenite is the champion melter. Mahavir is very similar to G200. Kingman and Custer are very similar. Our Minspar substitute is very similar to Minspar itself.


Materials Potash Feldspar
Materials G-200 EU Feldspar
Materials Fortispar
Materials G200 Old Blend Feldspar
Materials G-200 Feldspar
Materials Custer Feldspar
Mahavir PF01 Feldspar Data Sheet
Typecodes Feldspar
The most common source of fluxes for high and medium temperature glazes and bodies.

By Tony Hansen

Tell Us How to Improve This Page

Or ask a question and we will alter this page to better answer it.

Email Address




CAPTCHA, All Rights Reserved
Privacy Policy