... )CNPC brand,high quality 2)ultra-fine Copper Powder particle size:3.0-6.0um,high purityCu99.7% 3)factory price ... 1)CNPC brand,high quality2)ultra-fine Copper Powderparticle size:3.0-6.0um,high purityCu99.7%3)factory price ... material, laser welding diamond tools, high temperature alloy, and rechargeable battery etc. STANDARD SPECIFICATIONCHEMICAL COMPONENT %Cu≥ 99.7Pb< 0.005O< 0.15S ...