... Plugged with Solder Mask, RoHS Compliance. 2-Layer PCB,Gold Finger,Blue Solder Mask,Vias Plugged with Solder Mask, ... warp & twist check) Dimensional Inspection (finished hole sizes, pcb profiles, etc) MicrosectionSolderability Test (245±5ºC; 3-5 ... -0Surface FinishingHASL, LF-HASL, ENIG, Flash Gold, Immersion Tin, Immersion Silver, OSP,Gold Finger, Peelable Mask, Carbon PrintingMaterialFR4, ROGERS, ...