PCB board after the final product inspection, then vacuum packed storage waiting for shipment. So why pcb using vacuum packaging?? after vacuum packaging how to store? How long its shelf life, and how do? Below will give you a brief introduction of printed circuit board (PCB) storage and quality guarantee period.
Why to vacuum packed PCB board? A lot of circuit board manufacturers attach great importance to this problem. Because the PCB board once not good sealing, the surface immersion gold, spray tin and welding pad position will be oxidized and the effects of welding, is not conducive to the production.
How does the PCB board store it? The circuit board is no better than other products, it can't be in contact with air and water.
First PCB board vacuum can not be damaged, the need to pack in the box on the edge of a layer of bubble film, bubble film of water absorption is relatively good, so that the moisture has played a very good role.
After box must partition, from stored in ventilated and dry place, but also to avoid sun exposure. Best warehouse temperature control in 23 + 3 degrees, 55 + 10%rh. Under such conditions, heavy gold, gold, spray tin, silver plating surface treatment of PCB board can generally be stored for 6 months, immersion silver, immersion tin, OSP surface treatment of PCB board can generally be stored for 3 months.
For PCB board is not used for a long time, the circuit board manufacturers best in the brush on top of a layer of anti-corrosion paint, anti-corrosion paint can be moisture-proof, dust-proof, anti oxidation. So PCB board storage life can be increased to 9 months.