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These two Plainsman M370 test mugs were fired at cone 6, the left one with G2934 matte glaze, the right one with G2934Y4 matte. They look and feel identical in the hand. The two glazes have the same chemistry. But they employ different materials to source that chemistry. The secret of of the matteness is high MgO (magnesia content). In the glaze on the left MgO is sourced by dolomite, a lot of it. The glaze on the right sources it from a special frit, Ferro 3249. The impact of this difference is visible in the melt fluidity tester, the fritted one is melting and flowing much better. On other clays, especially stonewares, the G2934 can have a dry surface that cutlery marks. Thicker applications make it worse. But the Y version exhibits no such issues. Its mattness, durability, cleanability and hardness are so good that it is being used in floor tile.
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This is a 3D rendering of our melt fluidity tester. We have promoted this device for many years as an effective way to compare fired glaze properties (e.g. melt fluidity, surface tension, bubble retention, crystal growth, transparency, melting range, etc). Download the 3MF format file, open it in your slicer software and 3D print it. Then fill it will plaster and you have a working mold to slip cast these testers. With 0.8mm thick walls, it 3D prints quickly and is easy to remove from the plaster using a heat gun. The halves interlock using natches (requiring out embeds and related parts). The mold halves can also be lined up by the outer edges before clamping them together (thus not requiring natches).
URLs |
https://insight-live.com/insight/share.php?z=y9rvvqsPy4
G2934Y variations for fired hardness, COE adjustment, less crawling, etc G2934Y is a popular recipe used worldwide in industry and by potters and hobbyist. This page shows it, and four variations, that adjust for different purposes. All have the same chemistry, but source the needed oxides from different materials. |
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Glossary |
Melt Fluidity
Ceramic glazes melt and flow according to their chemistry, particle size and mineralogy. Observing and measuring the nature and amount of flow is important in understanding them. |
Recipes |
G2934Y - Cone 6 Magnesia Matte Low LOI Version
The same chemistry as the widely used G2934 but the MgO is sourced from a frit and talc instead of dolomite. It has a finer surface, less cutlery marking and staining. |
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