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Because of the environmental problems involved in the production process of PCB assembly Printed circuit board is especially prominent, and the requirements of human life environment are also improving, so the surface treatment of the O-lead on the pcb board washing machine Printed circuit board has also changed. There are many surface treatment processes for PCBs, such as the following: first, hot air leveling; two, organic solderable protector; third, surface coating of nickel and gold and so on. If you want to know more, you can click Printed circuit board supplier.