... Plugged with Solder Mask, RoHS Compliance. 12-Layer PCB,Taconic Material,2.0mm Thickness,Immersion Tin, ... & twist check) Dimensional Inspection (finished hole sizes, pcb profiles, etc) MicrosectionSolderability Test (245±5ºC; ... 4 layers - 16mil (0.4mm)6 layers - 24mil (0.6mm)8 layers - 32mil (0.8mm)10 layers - 40mil (1.0mm)Max Board ... ARLON, BT, Ceramic, Aluminum 12-Layer PCB with Taconic Material