... finger manufacturers, Rigao Electronics is a professional rohs lead free tg170 build-up multilayer pcb, immersion gold multilayer pcb ... 30 layer2MaterialFR-4,CEM-3,Hight TG,FR4 Halogen Free,FR-2,Aluminum3Board thickness0.2mm-7mm4Max.finished board ... , Rigao Electronics Co., Ltd, is privately held Shenzhen corporation dedicated to providing electronic engineering and manufacturing services. After ...