... "Min Board Thickness4 layer 0.40mm 16mil 6 layer 1.00mm 40mil 8 layer 1.20mm 48mil 10 layer 1.60mm 60milMax Ratio ... 0 oz, 1.5oz, 2.0oz,3.0 oz,4.0 ozSurface finishHASL,Nickle, Imm Gold,Imm Tin,Imm ... Silver, OSP etc.Board materialFR-4 glass epoxy, FR4 High Tg, RoHS compliant; Aluminum, Rogers ... stress288°C20 SecondsFlammability94V-0Test voltage50-300V 8 layer control PCB board