... ,multilayer PCBA 3)Good after-sale service Controllers for 1in1 Air conditioner pcba factoryPCBA specific instructionMaterial:FR-4Layer: 2 layersSurface finish, ... HAL, Gold plating, Chemical silver, etc.The other solder mask type we could do are: Red, yellow, white, black, purplePCBA& ... samples 3. 20-25days, with customers request and our new designProduction period: 15-20days (5 more days for trial ...