... , low cost&fast delivery. Welcome To Rigao ElectronicsShenzhen hasl lead free double-sided FR4 pcb board - Contract Manufacturing- Engineering ... 0.1mm)4-layer:0.01”±0.008”(0.4mm ±0.1mm)8-layer :0.01”±0.008”(0 ... .4mm ±0.1mm)Bow and twist < 7/1000 Copper ... Taconic,Isola,PTFE, Bergquist2). Surface Treatment: HASL,HASL lead-free,HAL,Flash gold,immersion gold,OSP,Gold Finger Palting ...