... design, PCB fabrication, PCB assembly, and engineering support. Yingstar PCB Technical Capabilities:layer1-36 layerMax Board Size1100*599mm 43.3" * 24" ... 1.20mm 48mil 10 layer 1.60mm 60milMax Ratio of Board thickness and Via diameter22:1Min space0.075mm 3milMin line width0.075mm ... finishHASL,Nickle, Imm Gold,Imm Tin,Imm Silver, OSP etc.Board materialFR-4 glass epoxy, FR4 High Tg, RoHS compliant; ...