Vulcan Black Stoneware Clay Fine 164-VUF

Vulcan Black Stoneware Clay Fine 164-VUF

Item: 164-VUF

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Product Description

Vulcan™ Black Stoneware (Fine) 164-VUF: Recommended 1200-1240C

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 (2205º-2269ºF)
  • 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

Notes regarding Vulcan black stoneware bodies

Vulcan is not toxic according to European Rules (CLP) and also American Rules (ASTM D 4036). The manganese dioxide content in Vulcan bodies is lower than 5%: Under the CLP regulation, the manganese dioxide content required for classification as toxic must be greater than 25%. 

Use zinc-free (Zn-free) glazes to prevent unexpected reactions such as bubbling or colour changes. Other elements that can react are zirconium (Zr) and tin (Sn). We have found that Mayco zinc-free clear glaze is suitable for use with Vulcan bodies and does not seem to suffer from the usual problems caused by outgassing from the high oxide levels in black bodies.

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