... Immersion Gold PCB&PCBA Service -For 15 years Experience in PCB Field-IPC-600 Class II and III Workmanship Standard-UL,TS16949, ... 6oz.9) Solder mask color: Green/Yellow/Black/White/Red/Blue.10) Copper thickness in hole: >18um11) Inner packing: Vacuum packing ... Quality ensure: UL approval, TS16949:200214) Special requirements: Buried and Blind vias, impedance control, via plug, BGA soldering, Gold ...