After the final product inspection, the PCB board is vacuum packed and stored for shipment. So why is the PCB board vacuum packed? How to save after vacuum packaging? How long is its shelf life?
As a professional manufacturer of printed circuit boards, JHYPCB will briefly introduce the storage methods of PCB boards and their shelf life.
Why do PCB boards need to be vacuum-packed?
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, the surface of the Immersion gold, spray tin, and pad parts will oxidize and affect the welding, which is not conducive to subsequent PCB assembly.
So, how to store PCB boards?
The circuit board is different from other products in that it cannot be in contact with air and water. First of all, the vacuum packaging of the PCB board cannot be damaged. A layer of bubble film must be placed on the side of the box when packing. The bubble film has better water absorption, which has a good effect on moisture prevention. Of course, moisture-proof beads are also indispensable. Then sort them and place them on labels. After sealing, the box must be stored in a dry and ventilated place with partition walls and off the ground and avoid 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. Surface-treated PCB boards such as immersion tin, OSP, etc., can usually be stored for 3 months.
For PCB boards that have not been used for a long time, the circuit board manufacturer is best to apply a layer of three-proof paint on it. The role of three-proof paint can prevent moisture, dust, and oxidation. In this way, the PCB storage life will increase to 9 months.