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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 is obtained (Note: Too-heavy reduction will cause bloating).
Containing 40% fine grog (up to 80 mesh), Vulcan Black Stoneware Fine has been formulated 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 detailed work. Supplied in a 12.5kg bag.
Vulcan Black Stoneware (Fine) 164-VUF is suitable for tableware (food-safe), according to ISO 6486 when fired as recommended (less than 3% porosity).
Firing range: Cone 5-6 (1208º-1242ºC)
Biscuit: Cone 06 (1012ºF)
Water content: 21%
Plasticity (IP Atterberg): 22
Carbonate content (CaCO3): 0%
Drying shrinkage: 7.0%
Firing shrinkage at Cone 6: 7.1%
Porosity (water absorption) at Cone 6: 1.3%
Dry bending strength: 4.6 N/mm2
Fired bending strength at Cone 6: 33.3 N/mm2
Thermal coefficient (a25-500ºC): 51.1x10-7ºC-1