... -4 , Halogen-free FR-4 , aluminium ,Ceramic(96% Alumina) Teflon,PTFE(F4B,F4BK), Rogers(4003,4350,5880) Taconic(TLX-8,TLX ... %Surface FinishingHASL, Lead free HASL, Immersion gold, Immersion tin, Immersion Silver.Plated gold , OSP, Carbon ink, Insulation Resistance 1012ΩPeel-off strength1 ...