Black Earthenware Clay

Black manganese earthenware clay. Its black colour in oxidising atmosphere is a highlight in the range of low firing colours. Its fineness and plasticity make it an excellent choice for throwing and modelling. Very good behaviour with standard pottery glazes. Available in extruded body (moist form) in a wide range of water content depending on the shaping application: wheel-throwing, modelling and shaping processes.

Firing range: 970-1025ºC / Cone 06-05
Water content (throwing): 21%
Plasticity (IP Atterberg): 15
Carbonate content (CaCO3): 8%
Drying shrinkage: 5.4%
Firing shrinkage 1000ºC: 0.9%
Porosity (water absorption) at 1000ºC: 15.8%
Dry bending strength: 5.3 N/mm2
Fired bending strength 1000ºC: 28.9 N/mm2
Thermal coefficient 1000ºC (25-500ºC): 81.7x10^-7ºC^-1