... , 2 layer PCB with immersion tin finished. 2. good quality, fast delivery, competitive price. 3. good technical services 1oz copper thickness immersion ... , assembly services offer.1-12 layer PCB board,1-2 layer Aluminum base PCB1/3oz- 4oz copper thickness PCB board,CEM-1,CEM ... TG, High CTI, PTFE, Ceramics, Aluminum based etc. 1oz copper thickness immersion tin double side PCB board