3 Kg Kilo MF Series Furnace Graphite Crucible Melting Gold Silver Copper Hardin Casting Tool 3 Kg MF Series - Hardin-180 Furnace Graphite Crucible Capacity 3 Kg of Gold; other material volumes will vary Designed for Electric Melting Furnaces This crucible is not to be used in an open fire forge or propane furnace that uses direct heat Graphite Crucibles are wear parts and will need to be replaced after prolonged use