... baords Thick0.21-7.0mm11Minimun thickness of soldermask 10um 12Soldermask Green,Yellow,Black,Blue,White,Red,transparent photosensitive,,soldermask,Strippable soldermask13Minimum ... and High Thickness copperwe are a professinoal PCB/PCBA manufacturer with ISO9001;2000 approval,ISO14001:2004 and the UL approval.we ... and further suggestion which give us the privilege of working with you. multi-layer pcb