1)double side pcb 2)8 years of experience in PCB industry 3) ... 4)UL.SGS.ISO9001,ROHS,QS9000 and ISO TS16949 double side pcb Immersion gold PCBOur PCB got UL,SGS,ROHS,ISO9002 ... board assembly1Layer1-30 layer2MaterialFR-4,CEM-1,CEM-3,Hight TG,FR4 Halogen Free,FR-1,FR-23Board thickness0.2mm-7mm4Max.finished ...