mainly used for non-ferrous metals melting ,like gold , silver, aluminum, Saturn, Zn etc ,and carbon steel ,all kinds of rare metals .   
  applied to carbon burning furnace, oil burning furnace, natural gas furnace, electricl furnace , induction furnace
  life span:3 month for aluminum melting and aluminum alloy 
  0.5# graphite crucible --3500 graphite crucible, all types in hand .