G2931K
DraftDescription
G2931K is a lead-free, all-fritted transparent clear glaze formulated for cone 03, optimized for use on Zero3 stoneware and porcelain. It is engineered to provide superior clarity, gloss, and fit, min
Original Author
Tony Hansen
Usage Instructions
G2931K is a lead-free, all-fritted transparent clear glaze formulated for cone 03, optimized for use on Zero3 stoneware and porcelain. It is engineered to provide superior clarity, gloss, and fit, minimizing boron-blue clouding and micro-bubbling through a balanced Al2O3:SiO2 ratio and controlled CaO levels. Application: Dipping is recommended for optimal consistency. Maintain a specific gravity of 1.43. If thixotropy is insufficient, add Epsom salts to reach a creamy, brushable, or dip-ready viscosity. Firing: A drop-and-hold schedule (e.g., cone 03, 1950°F/1065°C) is required to ensure full vitrification and to clear micro-bubbles. Thermal Expansion: This glaze is designed for bodies with mid-range thermal expansion. It may craze on zero-talc porous bodies and shiver on high-talc bodies. Expansion can be modified by adjusting alkali flux (KNaO) ratios or through the addition of stains and Zircopax (2–3% addition of Zircopax is recommended with stains to prevent surface defects like orange peeling or bubbling). Preparation: For dipping, use a water-to-powder ratio of 4.5 kg water to 5 kg glaze powder. For brushing, incorporate 1.5% CMC gum and 1.5% Veegum. Safety/Stability: Ensure uniform application thickness; excessive accumulation in recessed areas may trap air. G2931K is not intended for firing ranges below cone 04.