PM black 12.5kg

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*: 970-1040ºC / Cone 07-05
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

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

(*) 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.