Natural High-Purity Graphite: The groove graphite crucible offers excellent high-temperature resistance and good thermal conductivity. It is less prone to deformation under heat and is specifically designed for electronic melting furnaces, making it easy to remove after use. 3KG Large Capacity: 334ML capacity, it can melt up to 6.4KG of gold, 3.5KG of silver, 3KG of pure copper, and 0.9KG of pure aluminum, making it ideal for smelting and casting precious metals. Not for Open Flame Heating: Pure graphite crucibles are not suitable for open flame heating such as propane furnaces or carbon furnaces. They are designed for use with electric furnaces, vacuum furnaces, or gas-protected furnaces. High-Strength Coating: The surface of the graphite crucible is coated with a dense glaze, which extends its service life. It is recommended to use one batch of material per crucible to avoid metal contamination. Always inspect the crucible before each use and replace it when necessary to maintain optimal performance. Groove Adaptation: The top of the crucible features a ring-shaped groove, making it easy to grip with tongs for pouring. This design ensures safety and stability, making it ideal for beginners in metal melting. Color: Black Material: Graphite Package Contents: 1 x Crucible Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.