1200-1260˚C

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