OTOOLWORLD 1KG Clay Graphite Crucible Foundry Cup Furnace Torch Melting Casting Refining Gold Silver Copper Brass Aluminum Lead Zinc and Alloys This crucible has strong corrosion resistance to acid and alkaline solution, and has excellent chemical stability and thermal shock resistance. Melting Casting Refining Gold Silver Copper Brass Aluminum Lead Zinc and Alloys Can be used in Fuel Furnaces, Medium/High Frequency Heat Induction Furnaces and Kilns Furnaces, Biological pellet furnaces, Natural gas Furnaces, Coke Ovens, Coal Stoves, etc All raw materials are carefully selected in multiple links. Has good thermal conductivity, saves fuel, saves money and is environmentally friendly Check the size on listing photo