... crucibles is mainly used for gold ,siver, copper and other precious metal melting. Yihui castingJewelry crucible, ... .Mainly used for Precious metal smelting and casting( gold&silver&copper melting and casting),refractory product,jewelry industry, watch industry ... crucible, carbon crucible, crucible graphite, fit for famous melting and casting machine, like Yasui, Indutherm, Schultheiss, Top cast ...