... .80mm certificate:UL,ROHS,REACH,SGS OEM,ODM HASL four layer pcb board CategoryItemHigh-volume processing capacitySample and small ... -free HASL, Electroless silver, osp , Thick gold platingPlates PlatesFR-4, CEM3, different high-frequency substrate εr (domestic and imports), ... 0.10mmMaximum size600mmX1200mm1200mm-2000mmImpedance Impedance Tolerance±10%±5% HASL four layer pcb board ,4 layer pcb board