... customer's requirements process2 layersPCB assemblySolder mask: wet green paint, dry green paint, and UV paintBase material: FR-4, 94vo, CEM-1, ... CEM-3 and 94HBSurface finish: hot air solder leveling (tin, ... gold (tin, silver), OSP, selective immersion gold and gold plating PCB Assembly and Production Services for Single Side Double Side or ...