Quality material: Our casting ingot crucible moulds are made of graphite material with almost no ash content, ensuring the metal refining process does not affect the purity of the metal. These moulds are durable, sturdy, reliable, and reusable, and are not easily broken or deformed, allowing for long-term use. Size detail: The external dimensions of the silver and gold ingot mould are approximately 100 x 50 x 25 mm (3.94 x 1.97 x 0.98 inches), with an internal size of approximately 90 x 40 x 20 mm (3.54 x 1.57 x 0.79 inches). The capacity is suitable for about 1 kg of gold or 500 g of silver, meeting everyday usage needs. Good performance: The ingot crucible mould offers excellent thermal conductivity, significantly reducing melting time and saving energy. It can withstand temperatures up to 2000 degrees Celsius and features good resistance to acid, impact, alkali, and corrosion. It has a compressive strength of 89 MPa and a flexural strength of 48.7 MPa. Various applications: This graphite casting mould is suitable for experiments and melting non-ferrous metals such as gold, silver, aluminum, copper, brass, and zinc. It can also be used for experimental analysis after melting and serves well as an ingot mould for various purposes. Color: Black Material: Graphite Package Contents: 1 set x crucibles for melting metal Note: The package includes only the items listed above. Other products are not included. Light and display differences may cause slight variations between the color of the item in the photo and the actual product. Measurement error is permitted within +/- 1-3 cm.