... :1-LayerSurface finished:OSPLine width&space8/9milsFinished copper:3ozSolder mask:white;Material:CU copper base material.Certificates:CQC,ISO.TS16949,SGS,ISO9001,UL ... core pcb,cause of the material is too expensive.so it also lead to copper base pcb price always higher. ... kdpcb pcb manufacturer has strong network with the best copper base PCB material manufacturers in china, with kdpcb own metal pcb ...