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Onyx Black Porcelain takes on a beautiful black/graphite colour when fired as recommended to the upper part of its firing range. It is highly plastic making it ideal for wheel-throwing and modelling alike. Suitable for tableware. Supplied in a 5kg pack.
Onyx Black Porcelain is suitable for tableware (food-safe), according to ISO 6486.
Firing range: Cone 6-7 (1242º-1260ºC
Biscuit: Cone 06 (1012ºC)
Water content: 20%
Plasticity (IP Atterberg): 11
Carbonate content (CaCO3): 0%
Drying shrinkage: 5.4%
Firing shrinkage at Cone 6: 10.3%
Porosity (water absorption) at Cone 6: 0.0%
Fired bending strength at Cone 6: 39.8 N/mm2
Thermal coefficient (a25-500ºC): 54.3x10-7ºC-1"