LUNA speckled stoneware 12.5kg

Speckled stoneware clay with impalpable grog 0-0.2 mm. Designed for artistic ceramics, it contains melting minerals that develop a seductive surface with dark spots of different sizes and shades that stand out in an ivory-white matrix. Its high grog content provides excellent behaviour during drying and firing. Decoration with transparent glazes is ideal to enhance the vividness of the speckled effect. Available in extruded body (moist form).

Firing range*: 1200-1260 ºC / Cone 5-7
Biscuit temperature: 1060 ºC / Cone 04
Water content: 19 %
Plasticity (IP Atterberg): 14
Carbonate content (CaCO3): 0 %
Drying shrinkage: 5.8 %
Firing shrinkage 1260 ºC: 5.3 %
Porosity (water absorption) at 1260 ºC: 0.0 %
Dry bending strength: 2.7 N/mm2
Fired bending strength 1260 ºC: 29.2 N/mm2
Thermal coefficient 1250 ºC (25-500 ºC): 61.1x10^-7 ºC^-1

Available in the United States and Canada. ACMI AP Seal. Conforms to ASTM D-4236

Firing recommendations
• The vivid mottling characteristic of the LUNA body is due to the presence of natural minerals that may contain traces of compounds susceptible to rehydration after low-temperature firing, which may cause chipping. To minimize this risk, it is recommended to carry out the bisque firing at higher temperatures (1050–1080 °C) and increase the soaking time. Alternatively, whenever possible, it is advisable to work in single firing, where this effect does not occur.
• Due to the presence of small fluxing minerals in the composition, the use of kiln shelf protection during firing is recommended.

(*) 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.