... -28 layer2MaterialFR-4,CEM-1,CEM-3,Hight TG,FR4 Halogen Free,Aluminum, Ceramic, Rogers,F4B,Teflon3Board thickness0.2mm-6.0mm4Max.finished ... )7Min.line spaceing0.076mm(3mil)8Surface finish/treatmentHALS/HALS lead free,Chemical tin,Chemical Gold,Immersion gold Inmersion Silver/Gold,Osp ...