|Monthly Tech-Tip |
No longer available. When looking for a substitute, note how high KNaO content in this. It is much higher than Minspar or Custer. G200 HP, although having a different ratio of K2O/Na2O shares the high KNaO content (and other oxides levels are very similar).
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.
The most common source of fluxes for high and medium temperature glazes and bodies.