... Certification; 5, High quality, low cost&fast delivery. Welcome To Rigao ElectronicsShenzhen hasl lead free double-sided FR4 pcb board - Contract ... - Components purchasing- Cable and Wire Assemblies- Plastics and Molds- Fast turn around 1. Double-Sided FR4 material 1 oz copper ... ,Taconic,Isola,PTFE, Bergquist2). Surface Treatment: HASL,HASL lead-free,HAL,Flash gold,immersion gold,OSP,Gold Finger Palting ...