... ,ROHS,REACH,SGS OEM,ODM HASL four layer pcb board CategoryItemHigh-volume processing capacitySample and small batch processingTechnology Product ... CategorySingle / dual panel, multilayer, high-frequency board, with buried / blind plateMulti-material mixing pressureSurface TreatmentChemical Immersion ... Impedance Tolerance±10%±5% HASL four layer pcb board ,4 layer pcb ...