... layers HDIMaterialCEM1,CEM3,FR-4,High TG FR4,halogen-free FR4,aluminium,ceramic etc.Maximum Size610mm×1200mmBoard thickness0. ... Mask Bridge0.025mmImpedance Control Tolerance1.±5%Surface finishingHASL,LEAD-FREE HASL,Immersion gold,Immersion tin,Immersion Silver,Plated gold ... Red,White,Yellow,Black,BlueQuality StandardsIPC-A-600F and MIL-STD-105D CHINA GB4588 SMT electronics manufacture and rigid pcb