Key Factors Affecting PCB Shelf Life

1. Surface Finishing Method (Most Critical Factor)

Different surface finishes vary in their sensitivity to oxidation and humidity, which directly affects the PCB’s shelf life.

2. Storage Environment

· Temperature: Maintain between 20–25°C
· Humidity: Keep below 60% RH
· Packaging: Vacuum sealing with desiccants can effectively extend shelf life
· Light and Dust Protection: Avoid direct sunlight and dust exposure, as these accelerate surface deterioration.

3. Storage After Opening

Once the vacuum seal is broken, PCBs become exposed to air and moisture, causing oxidation to progress more rapidly. · OSP boards: Recommended to be used within 24–72 hours after opening · ENIG and HASL boards: Can last slightly longer, but should be used within one week · Unused boards: Should be re-sealed under vacuum and stored in a dry cabinet


Note: Using PCBs beyond their recommended shelf life may result in poor solderability, increased contact resistance, or functional failure.