PRNG Black Sculpture 12.5kg

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).

• 40% Coarse Grog
• 12.5kg
• Firing range: 1200-1260ºC/ Cone 5-7
• Biscuit temperature: 1000ºC
• Water content: 20%
• Plasticity (IP Atterberg): 22
• Carbonate content (CaCO3): 0%
• Drying shrinkage: 6.5%
• Firing shrinkage (1260ºC): 4.4%
• Porosity (water absorption at 1260ºC): 7.8%
• Dry bending strength: 3.0 N/mm2
• Fired bending strength (1260ºC): 17.7 N/mm2
• Thermal coefficient (25-500ºC): 51.3x10^-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.