SIO-2 PRNF Black Sculpture Ceramic Pottery Clay - 27.6 lb

Black sculpture clay with 40% fine grog 0-0.5 mm (up to 35 Mesh). Formulated for artistic ceramics, it is ideal for sculpture. The high content of grog confers a beautiful textured surface and 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. Available in extruded body (moist form). Firing range: 1200-1260ºC / Cone 5-7 Biscuit temperature: 1000ºC / Cone 06 Water content: 21% Plasticity (IP Atterberg): 19 Carbonate content (CaCO3): 0% Drying shrinkage: 8.1% Firing shrinkage 1260ºC: 3.7% Porosity (water absorption) 1260ºC: 8.8% Dry bending strength: 5.7 N/mm2 Fired bending strength 1260ºC: 29.5 N/mm2 Thermal coefficient 1260ºC (25-500ºC): 50.8x10^-7ºC^-1 Recommendations for use with glazes: Use zinc-free (Zn-free) glazes to prevent from unexpected reactions such as bubbling or colour 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.