... , low cost&fast delivery. Welcome To Rigao ElectronicsShenzhen hasl lead free double-sided FR4 pcb board - Contract Manufacturing- Engineering ... .004”(0.2mm ±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 ... ,Taconic,Isola,PTFE, Bergquist2). Surface Treatment: HASL,HASL lead-free,HAL,Flash gold,immersion gold,OSP,Gold Finger Palting ...