G2934Y
DraftDescription
G2934Y is a cone 6 magnesia matte base glaze formulated as a higher-fluidity, lower-LOI alternative to the dolomite-based G2934. By sourcing MgO from Ferro Frit 3249 and talc, the recipe achieves supe
Original Author
Tony Hansen
Usage Instructions
G2934Y is a cone 6 magnesia matte base glaze formulated as a higher-fluidity, lower-LOI alternative to the dolomite-based G2934. By sourcing MgO from Ferro Frit 3249 and talc, the recipe achieves superior melt fluidity and a smoother surface with reduced micro-bubble populations. It is a highly effective host for pigments and stains, though high MgO levels may cause crawling in concave areas or at thick application points. To manage crawling, ensure consistent, thin application, rapid drying, and optimal slurry rheology through flocculation. The glaze exhibits low thermal expansion and generally resists crazing. Its matteness is sensitive to cooling rates: fast cooling produces a silky finish, while slow cooling promotes a drier, stony surface prone to cutlery marking. If cutlery marking persists, blend in a small percentage (10–20%) of a transparent glossy base like G2926B. Mix instructions: Aim for a cream-like consistency; typical usage is 1000g powder to 1100g water, adjusted to a specific gravity of 1.43–1.44. Use a mixture of calcined and raw kaolin to balance drying shrinkage and hardness; replace raw kaolin with bentonite if improved suspension is required. The recipe is an ideal base for most stains, excluding purples, though excessive stain or opacifier levels may require formula adjustments to prevent crawling or surface defects.