PCB boards are inspected by final products, and then stored in vacuum after OK, waiting for shipment. So why do PCB boards need vacuum packaging? How to store after vacuum packing? How long is its shelf life? The following edition of PCB factory will give you a brief introduction to the storage mode and shelf life of PCB.

 

 

Why should PCB be packed in vacuum? Although this problem is small, it is a problem that many circuit board manufacturers attach great importance to. Because once the PCB board is not sealed properly, the gold deposit, tin spraying and the welding pad will be oxidized and affect the welding, which is not conducive to production.

 

 

So, how do PCB boards be stored? Circuit boards, unlike other products, are not in contact with air and water. First, the vacuum of PCB board can not be damaged. When packing, it is necessary to surround the box with a layer of bubble film. The water absorption of bubble film is better, which plays a very good role in moistureproof. Of course, moistureproof beads are also indispensable. Then separate the discharge and label it. After closing the box, the box must be partitioned and stored away from the ground in a dry and ventilated place, but also to avoid sunlight. The temperature of warehouse should be controlled at 23, 55, 10% RH. Under such conditions, PCB boards with surface treatments such as gold precipitation, electro-gold, tin spraying and silver plating can generally be stored for 6 months, and PCB boards with surface treatments such as silver precipitation, tin precipitation and OSP can generally be stored for 3 months.

 

 

For PCB boards that have not been used for a long time, it is better for circuit board manufacturers to brush a layer of three-proof paint on them. The function of three-proof paint is moisture-proof, dust-proof and oxidation-proof. In this way, the storage life of PCB board will increase to 9 months. Shelf life