... 20mm certificate:UL,ROHS,REACH,SGS Double-Sided Gold Board CategoryItemHigh-volume processing capacitySample and small ... buried / blind plateMulti-material mixing pressureSurface TreatmentChemical Immersion Gold, chemical Shen tin, electroless nickel deposit Lead-free ... HASL, Electroless silver, osp , Thick gold platingPlates PlatesFR-4, CEM3, different high-frequency substrate ε ...