G2916F Transparent Cone 6 Glaze
This is an industrial tableware glaze recommended by tech support at Fusion Frits. It not only fires hard and crystal clear but has outstanding suspension and application properties. In addition, it works well with most stains.
The magic for the way this glaze fires and its hardness and durability lie in the variety of fluxes in contains and the very low boron content coupled with high SiO2 and Al2O3. The fluxes most likely to create micro-bubbles at this temperature are sourced in a frit. It has the traditional CaO and KNaO, but the talc adds MgO and the frit adds SrO plus a tiny bit of BaO. This mixed-oxide effect produces a very well melting glaze yet having excellent body (considering it has only 18% of a low-boron frit).
To prepare the transparent glaze for use mix equal weights of water and powder to produce a specific gravity of 1.45 (1 kg powder produces about 1.3 liters of glaze). If you have already mixed it or are topping up a previous mix, measure the specific gravity and adjust as needed. Screen through 80 mesh (there are tiny agglomerates that will not break down without screening). Add a flocculant (like vinegar or Epsom salts) to gel the glaze until it has a viscosity such that the motion of the slurry stops in about two seconds, after stopping vigorous stirring, and then bounces back slightly (that bounce back is called the thixotropy). At this gelled consistency you should be able to evenly glaze bisque or dry ware with a 1-2 second dip, it will hang on in an even layer without dripping. This will work whether bisque has been fired to cone 06, 04 or 02 (hotter bisques will dry slower of course).
The recipe of this glaze is not proprietary. We developed it and sell it premixed but if you want to batch it yourself, please feel free to do so. For more detailed information at the Digitalfire Reference Library (e.g. the recipe, mixing your own, more pictures) click here. The mechanism of the recipe is explained, this may empower you to adjust it to you needs.
Safety Data SheetClick here for web view (format adheres to Globally Harmonized System of Classification and Labelling of Chemicals - GHS)