Vulcan Black Stoneware Clay Coarse 164-VUC
Description
Firing Range: 1200°C-1260°C
IMPROVED RECIPE: From batch number 2322 (week 23, 2022) recipe improvements have been made to improve the fired colour (darkness) and plasticity.
Caution
Vulcan Black Stoneware is sensitive to 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.
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 coarse grog (up to 12 mesh) Vulcan Black Stoneware Coarse 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 larger scale handbuilding.
Vulcan Black Stoneware (Coarse) is not recommended for tableware. However, Vulcan Black Stoneware (Fine) is suitable for tableware.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%.
Elements that can react with this clay are Zinc, (Zn), zirconium (Zr) and tin (Sn).
For more information on this clay, please follow this link: Technical Data
- Texture: 6
- Fired Colour: Black
- % Total Shrinkage at 1100°C: N/A
- % Total Shrinkage at 1200°C: N/A
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 coarse grog (up to 12 mesh). Vulcan Black Stoneware (Coarse) is not recommended for tableware.
Extra Info
- Firing range: 1200-1260ºC
- Biscuit temperature: 1000ºC
- Water content: 21%
- Plasticity (IP Atterberg): 22
- Carbonate content (CaCO3): 0%
- Drying shrinkage: 7.0%
- Firing shrinkage (1260ºC): 3.6%
- Porosity (water absorption at 1260ºC): 9.8%
- Dry bending strength: 2.0 N/mm2
- Fired bending strength (1260ºC): 22.0 N/mm2
- Thermal coefficient (25-500ºC): 50.3x10^-7ºC^-1
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