PRAI White Stoneware Clay

White stoneware clay with 40% impalpable grog 0-0.2 mm (up to 80 Mesh). Formulated for artistic ceramics, it is ideal for throwing and modelling smooth pieces with fine details. The high content of grog confers an excellent behaviour during drying and firing. Its particular ivory colour after firing is much appreciated and provides an excellent ware for glazes and colouring oxides, which develop bright and intense tones. Suitable for tableware (food-safe), according to ISO 6486. Available in extruded body (moist form).

Firing range recommended for the clay to develop its best performance, both in terms of technical and safety characteristics, under conventional firing conditions. The colour samples may show temperatures outside the recommended range to provide a broader view, but these are pieces fired under controlled conditions. Cone equivalence according to Orton table for self-supporting cones, regular-SSB and 150ºC/hr heating rate

Specifications:

• Firing range: 1240-1300°C / Cone 6-10
• Biscuit temperature: 1000°C / Cone 06
• Water content: 19%
• Plasticity (IP Atterberg): 16
• Carbonate content (CaCO3): 0%
• Drying shrinkage: 5.9%
• Firing shrinkage 1300ºC: 7.0%
• Porosity (water absorption) at 1300°C: 0.0%
• Dry bending strength: 3.0 N/mm2
• Fired bending strength 1300°C: 51.0 N/mm2
• Thermal coefficient 1250°C (25-500°C): 60.4x10^-7ºC^-1
• Firing: Ceramic kiln high fire
• Grog: Impalpable grog
• State: Moist form (plastic body)
• Stiffness: 4 throwing and modelling