What are the Hazards of Using Expired PCB Circuit Boards?

When customers customize PCB products, they will produce more in quantity to prepare for their PCB projects. Over time, the PCB board will expire. So, what are the hazards of using expired PCB circuit boards?

1. Expired PCB fabrication may cause oxidation of surface pads
Oxidation of the solder pad will cause poor soldering, which may eventually lead to functional failure or risk of parts drop. Different surface treatments of circuit boards have different anti-oxidation effects. In principle, ENIG requires it to be used up within 12 months; while OSP requires it to be used up within six months. It is recommended to follow the shelf life of the PCB board factory. Ensure quality.

2. The expired SMD PCB may absorb moisture and cause the board to burst
After the circuit board absorbs moisture and undergoes reflow soldering, it may cause problems such as the popcorn effect, board burst, or delamination. Although this problem can be solved by baking, baking may cause other quality problems.

3. The bonding ability of expired fr4 PCB board may be degraded and deteriorated
After the circuit board is produced, the bonding ability between the layers will gradually degrade or even deteriorate over time. After the high temperature of the reflow furnace, it may cause delamination of the circuit board and the production of surface bubbles, which will seriously affect The reliability of the circuit board.