... Vias Plugged with Solder Mask, RoHS Compliance. 12-Layer PCB,Taconic Material,2.0mm Thickness,Immersion Tin,Impedance ... warp & twist check) Dimensional Inspection (finished hole sizes, pcb profiles, etc) MicrosectionSolderability Test (245±5ºC; 3 ... 8mil (0.2mm)4 layers - 16mil (0.4mm)6 layers - 24mil (0.6mm)8 layers - 32mil (0 ... , Taconic, ARLON, BT, Ceramic, Aluminum 12-Layer PCB with Taconic Material