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SIO-2 PRNI Black Stoneware Ceramic Pottery Clay | 4 lb, Cone 5-6 | High Fire Kiln-Fired Clay

<ul><li>HIGH FIRE: With a firing range of Cone 5-6 (1200ºC to 1240ºC), this stoneware clay with 40% impalpable grog is the perfect choice for potters seeking a stable and secure formula.</li><li>HIGHLY VERSATILE: This stunning black ceramic clay is valued for its smoothness, plasticity, stability and consistency. Can be thrown on a wheel or used for hand-building &amp; modelling.</li><li>PREMIUM QUALITY: All SIO-2 clays have been rigorously tested through strict quality standards, making them the ideal choice for both professional and amateurs alike.</li><li>IDEAL FOR GLAZES: It is recommended to use zinc-free (Zn-free) ceramic glazes to avoid unexpected reactions. We recommend consulting your glaze supplier to ensure proper suitability with this ceramic clay body.</li><li>MANUFACTURED SINCE 1874: Made in Spain by Ceramica Collet S.A., with ACMI non-toxic AP-Certification.</li></ul>

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Black stoneware clay with 40% impalpable grog 0-0.2 mm (up to 80 Mesh). Formulated for artistic ceramics, it is ideal for wheel-throwing and modelling smooth pieces with fine details. The high content of grog confers an excellent behaviour during drying and firing. Its beautiful and intense black firing colour in oxidising atmosphere is very exclusive of PRN range and becomes an ideal artistic mean of expression. In reducing atmosphere, metallic effects with shades of blue are obtained. Suitable for tableware (food-safe), according to ISO 6486. Available in extruded body (moist form). Firing range: 1200-1240ºC / Cone 5-6 Biscuit temperature: 1000ºC / Cone 06 Water content: 21% Plasticity (IP Atterberg): 19 Carbonate content (CaCO3): 0% Drying shrinkage: 8.2% Firing shrinkage 1240ºC: 5.4% Porosity (water absorption) 1240ºC: 4.0% Dry bending strength: 5.9 N/mm2 Fired bending strength 1240ºC: 51.4 N/mm2 Thermal coefficient 1240ºC (25-500ºC): 63.8x10^-7ºC^-1 Recommendations for use with glazes: Use zinc-free (Zn-free) glazes to prevent from unexpected reactions such as bubbling or color changes. Other elements that can react are zirconium (Zr) and tin (Sn). We recommend consulting your usual glaze supplier to ensure proper suitability with this ceramic clay body. Storage: Protect ceramic clay bodies from direct sunlight, avoiding excessive temperature changes and protect from frost. Use: Technical details are available with information on the characteristics of each product and its use. It is recommended to test clay body prior to large scale use in order to verify suitability in both the ceramic process (shaping, drying, firing and decoration) and the final application that is expected to be obtained. Safety: All SIO-2® clay bodies are certified by the Art & Creative Materials Institute (ACMI) and conform to ASTM D-4236 safety guidelines.