After over 60 years of developmnt,a system for R&D and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper After over 60 years of developmnt, a system for R & D and production of copper processing materials has already been shaped in China. After the reform and opening-up, the application of copper processing materials has hastened expanded from the military industry to civil field. annual output of copper