When the PCB board is vacuum packaged and shipped after the final product inspection, for the boards in batch orders, the general circuit board manufacturers will make more inventory or prepare more spare parts for customers, and then vacuum packaging and storage after each batch of orders is completed. Awaiting shipment. So why do PCB boards need vacuum packaging? How to store after vacuum packing? How long is its shelf life? The following Xiaobian of Xintonglian circuit board manufacturers will give you a brief introduction.
The storage method of PCB board and its shelf life:
Why do PCB boards need vacuum packaging? PCB board manufacturers attach great importance to this problem. Because once the PCB board is not sealed well, the surface immersion gold, tin spray and pad parts will oxidize and affect the welding, which is not conducive to production.
So, how to store the PCB board? The circuit board is no different than other products, it cannot come into contact with air and water. First of all, the vacuum of the PCB board cannot be damaged. When packing, a layer of bubble film needs to be surrounded on the side of the box. The water absorption of the bubble film is better, which plays a good role in moisture-proof. Of course, moisture-proof beads are also indispensable. Then sort them out and label them. After sealing, the box must be separated from the wall and stored in a dry and ventilated place away from the ground, and should also be protected from sunlight. The temperature of the warehouse is best controlled at 23±3℃, 55±10%RH. Under such conditions, PCB boards with surface treatments such as immersion gold, electro-gold, spray tin, and silver plating can generally be stored for 6 months. PCB boards with surface treatment such as immersion tin and OSP can generally be stored for 3 months.
For PCB boards that have not been used for a long time, it is best for circuit board manufacturers to paint a layer of three-proof paint on them. The functions of three-proof paint can prevent moisture, dust and oxidation. In this way, the storage life of the PCB board will be increased to 9 months.