|Monthly Tech-Tip |
This GLFL test compares the melt flow, at cone 6, of two glaze recipes containing the calcium carbonates (of which they make up 27%). Notice the amount of bubbles (due to the high LOI, or loss on ignition). The 3HX is flowing a little more. This could be because of a difference their proportions of dolomite and calcium carbonate minerals, the individual mineral purities or the particle size (or all three). Whatever the case, 3HX will make a glaze flow a slightly better.
Suspended micro-bubbles in ceramic glazes affect their transparency and depth. Sometimes they add to to aesthetics. Often not. What causes them and what to do to remove them.
Material substitutions in ceramic glaze and body recipes must consider their chemistry, mineralogy and physical properties