SIO-2 Clay

Terracotta Earthenware Clay

Traditional terracotta (calcareous) earthenware body. Its calcium carbonate content (19%) allows displaying an interesting palette of colours, from pink to straw colours,
depending on the firing temperature and atmosphere. Its coefficient of thermal expansion is ideal for standard glazes for pottery, in both once and twice firing processes. Its high resistance to frost and environmental degradation make it ideal for pieces exposed outdoors (garden pots, tiles, etc.).

Firing range: 990-1085ºC / Cone 06-03
Water content (throwing): 22%
Plasticity (IP Atterberg): 18
Carbonate content (CaCO3): 20%
Drying shrinkage: 6.9%
Firing shrinkage (1000ºC): 0.1%
Porosity (water absorption at 1000ºC): 15.4%
Dry bending strength: 8.5 N/mm2
Fired bending strength (1000ºC): 27.4 N/mm2
Thermal coefficient (25-500ºC): 74.1x10^-7ºC^-1