... acid, Impact resistance, and Good thermal conductivity .Mainly used for Precious metal smelting and casting( gold&silver&copper melting and casting),refractory product,jewelry ... , casting crucible, carbon crucible, crucible graphite, fit for famous melting and casting machine, like Yasui, Indutherm, Schultheiss, Top cast,Galloni VCM,Tanabe, DEGUSSA ...