Black Sculpture Clay (PRNG) 12.5kg

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About this product

Black sculpture clay with 40% very coarse grog 1-3 mm (from 18 to 7 Mesh). Formulated for artistic ceramics, it is ideal for extra large sculptural work and for pieces with high artistic expression. The big content of grog confers an interesting high rugged texture 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 Water content: 21% Plasticity (IP Atterberg): 19 Carbonate content (CaCO3): 0% Drying shrinkage: 7.6% Firing shrinkage 1260ºC: 2.5% Porosity (water absorption) 1260ºC: 9.3% Dry bending strength: 2.7 N/mm2 Fired bending strength 1260ºC: 13.4 N/mm2 Thermal coefficient 1260ºC (25-500ºC): 51.1x10^-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 sup

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