Warm Tips: Pure graphite crucibles cannot be heated in coal or carbon furnaces. Long Service Life -- The surface of the graphite crucible has a special glaze layer and dense molding material, which greatly improves the corrosion resistance of the product and extends its service life. This jewelry making tools will rust and break; pure graphite will begin to oxidize at 752 °F (400 °C). Graphite Crucible 3kg - High Purity for Metal Melting Graphite crucibles are essential in precious metal melting and refining. Whether you are working with gold, silver, or alloys, the right crucible ensures accuracy and efficiency. At , we supply a wide range of graphite crucibles designed for jewelers, laboratories, and large refining units Size: 1kg, 2kg, 3kg. 1KG Graphite crucible Diameter: 65mm ; Height: 125mm 2KG Graphite crucible Diameter: 72mm; Hight: 155mm; 3KG Graphite crucible Diameter: 75mm; Hight: 170mm; Weight: 330 - 465g More suitable for refining graphite crucible made of silicon carbide. Naajop Graphite Crucible High-Temperature Resistance Precious Gold Sliver Metal Melting Furnace Accessories Smelting Furnaces Crucibles Jewlery Casting Tools Capacity 1KG/2KG/3KG Ingredient: This melted gold and silver scrap steel furnace with 99., 9% graphite. Find high-quality small casting machines for various metals. Perfect for jewelry, auto parts, and more. Shop our reliable and affordable metal casting... The ash content is less than 0., 1%. Metal Melting Crucible Graphite Crucible Melting Furnace Kit For Jewelry - Tools For Melting Gold, Silver, Copper, Aluminum - 3KG Set With Tongs 3 Kg Graphite Crucible