... ,SGS,ROHS,ISO9001,IPC 4.manufacturer with rich experience Grandwork is professional and reliable PCB manufacturer which is located in Guangdong, ... high density board, including MLB with blind/buried via holesMain base material:FR-1, FR-2, FR-4, CEM-1, CEM-3 ... with various dielectric constant (imported or from local supplier), Aluminum base laminate, Metal core AluminumSurface Finish:Hot air Lev p lead ...