... .PCB Design,Electronics 4 Layer PCB 3.FR4,UL&ROHS Approval 4.Thermal consideration&B/B design Rigid multilayer 4 Layer PCB prototype ... PCB,High Density Inverter PCB,thick copper PCB3.Materials: FR-4, CEM-3, Teflon, Aluminum Substrate, Rogers, Halogen Free, ... Circuit Test),FCT(Functional Circuit Test) technology.4) PCB Assembly With UL,CE,FCC,Rohs Approval5) Nitrogen gas reflow soldering technology ...