Graphite crucible square graphite casting ingot bar mold for gold silver copper metal smelting refining tools Specification: Size: outer length x outer width x outer height Size: the size is outer size, you can choose the one you like Material:graphite Color: Black Can be customized processing of different sizes, contact the owner Used for melting gold and silver according to the formation principle of gold and silver piece mold or a graphite crucible melting non-ferrous metals Test analysis Graphite tank with high purity fine grain graphite, high density, not easy adhesion, easy mold release.