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Preparing balls for a melt fluidity firing test
Here is how to prepare a melt-flow ball for the GBMF test or the GLFL test: Weigh 11g of the frit and 0.33 of Veegum (the latter plasticizes the frit and imparts dry hardness). Put them in a small ziplock bag. Zip it to entrap air, roll the zipper down to inflate it and shake well to mix the Veegum and frit. Stir the powder into plenty of water in a small bowl. A brush works best for quick delumping and cleaning out the bowl when pouring onto a plaster slab. It dewaters very quickly, after about 10 seconds, just as the water sheen is gone, peel it up with a rubber rib. Smear it back down and peel it up every few seconds until it is plastic and formable (not sticky). Roll it into a ball, label it and dry it under a heat lamp (could take an hour, the Veegum really holds on to the water). When dry use a sharp knife to cut off enough to bring it down to 10 grams. One caveat: The Veegum is a melting catalyst, when comparing melts both sample should contain the same percentage.
Related Pictures
Various frits fired at 1950F
These sixteen GBMF test balls have melted down onto a slab of grogged clay. Kiln fired at 108F/hr for the last 100 degrees F and held for 15 minutes. This demonstrates the comparison value of this test and how various frits compare in their melting character.
Make frit melt fluidity test balls using CMC gum as a binder
Traditionally we have made GBMF test balls of non-plastic materials (e.g. frit) using Veegum as the binder. However, Veegum interacts with materials enough to affect melting. CMC gum is better. I use 10g frit (the right amount for one ball), 0.1g CMC (1%) and ~3g of water. Of course, you need a scale accurate to 0.01g to be able to weigh out only 0.1g (otherwise consider doing 50g). The procedure that seems to work best is to shake the frit/CMC mix in a small bag, pour it into a bowl, pour in a tiny amount of water and stir and smear with a spoon. With the right amount of work and water the thickened material will become cohesive and can be formed by hand. Does cornstarch work? No, it does not gel like this and the mix is not plastic either. Psyllium? Yes, but it has a flakey texture and demands more water. For better formability use 1.5% CMC gum - however, the ball will dry slower and much harder. Other powders will behave differently (needing more or less water, forming better or poorer, dewatering slower or faster). You will need a plaster surface to absorb the excess water (which invariably happens).
Links
| Tests |
Glaze Melt Fluidity - Ball Test
A test where a 10-gram ball of dried glaze is fired on a porcelain tile to study its melt flow, surface character, bubble retention and surface tension. |
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| Tests |
Glaze Melt Flow - Runway Test
A method of comparing the melt fluidity of two ceramic materials or glazes by racing them down an inclined runway. |
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