Vulcan Black Clay Fine

Vulcan Black Stoneware, providing unusual intense brown-black colour when fired in an oxidising atmosphere. In a reducing atmosphere a metallic finish and shades of blue is obtained (Note: Too-heavy reduction will cause bloating). Containing 40% fine grog (up to 80 mesh), Vulcan has been formulated for artistic ceramics. During drying/firing its high plasticity makes it ideal for modelling. Supplied in a 12.5kg bag.

1. Firing range: 1200-1240C / Cone 5-6
2. Texture 1-2 on our indicative texture scale, smooth1, coarse 10.
3. Biscuit: Cone 06 (1855ºF)
4. Water content: 21%
5. Plasticity (IP Atterberg): 22
6. Carbonate content (CaCO3): 0%
7. Drying shrinkage: 7.0%
8. Firing shrinkage at Cone 6: 7.1%
9. Porosity (water absorption) at Cone 6: 1.3%
10. Dry bending strength: 4.6 N/mm2
11. Fired bending strength at Cone 6: 33.3 N/mm2
12. Thermal coefficient (a25-500ºC): 51.1x10-7ºC-1