Ultrox 500W Zirconium Silicate Powder – 1 Micron Ceramic Glaze Opacifier Ultrox 500W is a premium-grade zirconium silicate powder engineered for high-performance ceramic glazing. With a finely milled 1-micron particle size, it offers exceptional whitening power and smooth, even coverage, making it an ideal opacifier for both white and colored glazes. Formulated with 65% ZrO₂ and 35% SiO₂, this professional-grade material matches the quality and performance of industry standards like Zircopax Plus and Superpax. It enhances chemical resistance, reduces glaze crazing by controlling thermal expansion, and supports consistent results across a range of firing temperatures. Whether used on sanitary ware, dinnerware, wall tiles, glazed brick, structural tile, or stoneware, Ultrox 500W delivers reliable, high-quality finishes, making it a must-have for ceramicists aiming for professional-quality results.