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Brand: SIO2 Ceramica Collet

Vulcan™ Black Stoneware (Medium) 164-VUM: 1200-1260C Vulcan Black Stoneware is unlike any othe...

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2.25 per unit) (Ex. VAT)


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Vulcan™ Black Stoneware (Medium) 164-VUM: 1200-1260C

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. Supplied in a 12.5kg bag.

  • Firing range: Cone 5-7 (1200º-1260ºC)
  • Biscuit: Cone 06 (1000ºC)
  • 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

    A note about manganese

    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%.  

    Glazing Vulcan bodies

    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 glaze 'milkiness' issues caused by outgassing from black bodies.

    Volumetric weight:1.000