PCB News - What are the hazards of using expired PCB circuit boards?

Customers always make more PCB products in order to prepare for emergencies. Over time, there will be a phenomenon that the PCB board expires but is ignored by itself. So, what are the hazards of using expired PCB circuit boards?
  1. Expired PCB 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 will have different anti-oxidation effects. In principle, ENIG requires that it be used up within 12 months; while OSP requires that it be used up within six months. It is recommended to follow the shelf life of the PCB board factory. Ensure quality.

  2, the expired PCB may absorb moisture and cause the board to burst

  After the circuit board absorbs moisture and undergoes reflow, it may cause problems such as popcorn effect, bursting or delamination. Although this problem can be solved by baking, baking may cause other quality problems.
  3, the bonding ability of expired PCB 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. When the high temperature of the reflow furnace is passed, it may cause delamination of the circuit board and the generation of surface bubbles, which will seriously affect The reliability of the circuit board.
  In short, the use of expired PCB circuit boards is still quite harmful, customers and friends should pay attention to it.

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