When customers customize PCB products, they will always make more in case of emergency. After a long time, there will be a phenomenon that theexpires but is ignored by itself. So, what are the hazards of using expired ?
1. Expired PCBs may cause oxidation of the surface pads
Oxidation of the pads will result in poor solder, which may eventually lead to functional failure or risk of dropped parts.
Different surface treatments of circuit boards have different anti-oxidation effects. In principle, ENIG requires that they be used up within 12 months; while OSP requires that they be used up within six months.
It is recommended to follow the shelf life of thefactory to ensure quality.
2. Expired PCB may absorb moisture and cause PCB cracking
Problems such as popcorn effect, cracking or delamination may occur when theabsorbs moisture and is reflowed. Although this problem can be solved by baking, baking may cause other quality problems.
3. The gluing ability of expired PCBs may degrade and deteriorate
After theis produced, the bonding ability between its layers will gradually degrade or even deteriorate over time.
When passing through the high temperature of the reflow furnace, it may cause the delamination of the circuit board and the generation of surface bubbles, which seriously affects the reliability of the circuit board.
In short, the harm of using expiredis still quite large, and customers and friends should pay attention.