... :2000 3.long working life 1. The materials of our Polycrystalline shaped mold are from the U.S.GE,Sumitomo, domestic ... polymer polycrystalline,CD,CVD,CSD,CXD and common polycrystalline and so on.2.We would choose ... is the first domestic enterprise to research and produce imported polycrystalline shaped drawing die,which led to our acquisition of the ...