Onyx Black porcelain

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.

 

5 kilos.

 

Onyx Black Porcelain is suitable for tableware (food-safe), according to ISO 6486.

 

1230-1260˚C

 

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"