... Controlled, Vias Plugged with Solder Mask, RoHS Compliance. 12-Layer PCB,Taconic Material,2.0mm Thickness,Immersion Tin,Impedance Controlled,Vias ... check) Dimensional Inspection (finished hole sizes, pcb profiles, etc) MicrosectionSolderability Test (245±5ºC; 3-5 sec) Thermal Test (288±5 ... Carbon PrintingMaterialFR4, ROGERS, Taconic, ARLON, BT, Ceramic, Aluminum 12-Layer PCB with Taconic Material