... width / spacing :3-4 mil (0.076-0.10mm) · Maximum board size: Single & Double 22 "x 43" (550 x1100mm), Multi- ... layer 22 "x 25" (550mm x 640mm) · Impedance Control: ± 10% · Surface Treatment: OSP, HASL, Electric Nickel / Gold, Chemical ... FR4 ( ShengYi, KB, International), high TG (TG150, TG170), halogen-free board (Halogen-free), high frequency plate (Rogers, Teflon, Taconic), made PTFE ...