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  • Potclays Vulcan Black medium 12.5kg

Vulcan Black medium 12.5kg

Article number: 164-VUM
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Vulcan Black medium 1200-1260˚C 12.5kg

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Vulcan Black Stoneware is unlike any other on the market, providing an unusual intense brown-black colour when fired in an oxidising atmosphere. In a reducing atmosphere a metallic finish with shades of blue are obtained. Containing a medium grog (up to 35 mesh) Vulcan Black Stoneware Medium has been formulated especially for artistic ceramics. It behaves excellently during drying/firing and its high plasticity makes it ideal for modelling. It is widely used for murals and sculpture and is ideal for handbuilding.



Firing range: Cone 5-7 (1207˚-1260ºC)


Biscuit: Cone 06 (1012ºC)


Water content: 21%


Plasticity (IP Atterberg): 22


Carbonate content (CaCO3): 0%


Drying shrinkage: 7.0%


Firing shrinkage at Cone 7: 4.5%


Porosity (water absorption) at Cone 7: 9.4%


Dry bending strength: 2.0 N/mm2


Fired bending strength at Cone 7: 27.5 N/mm2


Thermal coefficient (a25-500ºC): 55.8x10-7ºC-1


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