Potclays Onyx Black porcelain 5kg

Article number: 164-ONYX
Availability: In stock (15)
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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"

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