Vulcan Black Stoneware - Potclays (NEW)

1061 - 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.

Caution
Vulcan Black Stoneware (Fine) can be sensitive to too-fast cooling. It is recommended not to open the kiln until it has reached room temperature to avoid cooling breaks, especially in flat and thin pieces. Keep vent plugs in place during cooling. Do not open/crack open the kiln lid to rush the natural cooling process.

SIO2 Technical Data:

• Firing range: 1200-1240C / Cone 5-6 
• Texture 1-2 on our indicative texture scale, smooth1, coarse 10.
• Biscuit: Cone 06 (1855ºF)
• 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

(*) Firing range recommended for the clay to develop its best performance, both in terms of technical and safety characteristics, under conventional firing conditions. The colour samples may show temperatures outside the recommended range to provide a broader view, but these are pieces fired under controlled conditions.