1.High Frequency Board, RF PCB 2.LED PCB Factory directly 3.High quality&low price. 4.UL,ROHS,ISO9001. ... Finished Diameter of PTH Hole: 0.1mm Max. Board Thickness/Hole Ratio: 12:1 Min. Solder Mask Bridge ... across blind/buried vias, characteristic impedance control, Rigid-flex board etc. Reliability Test: flying probe test/fixture test, ... attention. Teflon PCB, Rogers PCB,Arlon PCB, High Frequency Board