Production technology of PCB HS code 85340010 Material FR-4, CEM-3,PTEE Teflon Outer size Maximum 457mmx610mm Thickness 0.016--0.125?(0.4?.2mm, 1.0mm, 1.2mm,1.6mm, 2.0mm are normal ones) Layers 2?2 (2,4,6,8 are normal) and 1? layers for flexible board Line width 6mil 0.15mm) Line distance 6mil 0.15mm) Minimum drill 0.25mm Copper thickness 18mil, 36mil, 72mil Copper thickness of hole 0.6mil---2mil Legend thickness 0.15mm (6mil) Tin thickness 0.04mil---1.2mil Moulding type milling machine, punch, cut out, V-cut bevel edge Surface technics spurt tin, gilt, plating nickel, spurt rosin, resist oxidation (OSP), HAI Surface coat black, green, brown, red, yellow Solder mask UV, photoresist aspect ratio 6:1 Surface evenness 1% inspection Flying probe tester inspection International UL safety standard, UL number: E216635 Tolerance ?.0127mm (5mil) ROHS All PCBs meet ROHS directive