... : PCB design, PCB fabrication, PCB assembly, and engineering support. Yingstar PCB Technical Capabilities:layer1-36 layerMax Board Size1100*599mm 43.3" * 24"Min Board Thickness4 layer 0 ... , 2.0oz,3.0 oz,4.0 ozSurface finishHASL,Nickle, Imm Gold,Imm Tin,Imm Silver, OSP etc.Board materialFR-4 glass epoxy ... /mmThermal stress288°C20 SecondsFlammability94V-0Test voltage50-300V 8 layer control PCB board