Onyx Black Porcelain 164-ONYX
COSHH Sheet
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Firing Range: 1230°C-1260°C
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.
For more information on this clay, please follow this link: Technical Data
- Texture - 1
- Fired Colour - Black
- % Total Shrinkage at 1100°C - N/A
- % Total Shrinkage at 1200°C - 10.3
Extra Info
- Firing range: Cone 6-7 (2269º-2295ºF)
- Biscuit: Cone 06 (1855ºF)
- 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%
- Dry bending strength: 3.1 N/mm2
- Fired bending strength at Cone 6: 39.8 N/mm2
- Thermal coefficient (a25-500ºC): 54.3x10-7ºC-1"
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