What Are The Completed PCB Storage Conditions?
What is the storage condition of the completed PCB? Is it defined in the IPC-A-600 specification? In which standard is it mentioned? In addition, how long can the PCB be vacuum-packed for storage? What should I do before the next use when the PCB cannot be used up all at once because of the production capacity after vacuum packaging? Like baking? Baking conditions and time?
The IPC has a defined test method for storage conditions. As for how the finished product should be stored, it will vary according to manufacturing and user conditions. As long as it is not worse than his test conditions, it should be safe. In addition to IPC specifications, JDEC reliability tests also have reliability test standards. In fact, these standards are also related to storage conditions. As for the JDEC test, there is a long-term storage simulation test to simulate the impact of storage conditions on the product. This section can also be used as a reference.
The storage conditions and the impact of the product will vary depending on the packaging method, product category, storage environment, etc. It is difficult to have an absolute standard, so it cannot answer how long you can store it, but you can make a rough judgment based on the reference data of JDEC . If you really can't use all the boards at once, just wrap them in a clean plastic bag and store them in a cool, dry environment. Generally, as long as it is not damp, most can be stored for a long time.
Unless you use a circuit board, the final metal surface treatment is a treatment with poor weather resistance, otherwise most will not be a problem. As for the baking problem, if the humidity of the circuit board is too high, there will be a risk of board explosion. Therefore, you can consider baking at 110 ° C for about 40 minutes before reassembly, which should reduce the chance of board explosion.