single layer pcb 1.UL,ROHS,ISO,SGS,Layer:2 ... gold circuit pcb, pcba & fpc , multilayer pcb, single layer pcbOur Factory Manufacture Capability ItemManufacture CapabilityMaterialFR-4 / Hi ... Compliant) /CEM-3, Aluminum, Metal basedLayer No.1-- 20Finished Board thickness0.2 mm-4.0mm’(8 mil ... 075mmPlatingHASL2.5umLead free HASL2.5umImmersion GoldNickel 3-7um Au:1-5u''OSP0.2-0.5umCertificateROHS, SGS, UL, ...