Shelf Life Expiration

Degradation Path

Sealed components can absorb moisture over long periods as water vapor slowly diffuses through the plastic barrier bags. Solder paste degrades as its flux component separates or reacts with the metal powder. These degradation processes lead to poor solderability and solder joint defects during assembly.

This chemical breakdown occurs even when parts are stored in controlled conditions.

Requalification Procedure

Components that have exceeded their storage dates must be evaluated before they can be released to the assembly line. This evaluation includes moisture analysis and solderability testing to verify that the leads are still clean and weldable. If the parts pass, they can be re-certified for a limited storage period.

If they fail, they must be baked or scrapped.

Material Management

Stock rotation systems use first-in first-out principles to minimize the risk of parts reaching their storage limits. Automated inventory software tracks the dates for all stored reels and alerts operators when parts are close to their limit. This proactive management helps reduce scrap rates and optimizes material utilization.

It ensures that older stock is used before newer shipments are opened. Warehouse supervisors review these reports weekly to plan production runs around expiring component batches. This schedule prevents the sudden discovery of expired stock that could halt an active assembly line.