Define what is being stored
Bare printed boards, packaged components and completed assemblies have different storage requirements. A bare-board surface finish must remain suitable for assembly, while an assembled product may also contain moisture-sensitive devices, batteries or mechanically delicate parts. Do not apply one generic shelf-life statement to all three.
Use the supplier’s material and packaging instructions together with the released product requirements. Record the board revision, manufacturing lot, finish and receipt condition. Those details are needed to evaluate a later storage excursion or solderability concern.
Preserve the specified packaging
Select packaging appropriate to moisture, contamination, mechanical and electrostatic risks relevant to the item. Inspect seals and labels on receipt. Where desiccant and humidity indicators are specified, interpret them using the applicable packaging instructions rather than assuming every sealed bag provides the same protection.
Track opening and repackaging when exposure limits apply. Handle boards to avoid contaminating functional surfaces or stressing populated areas. Racks, separators and containers should support the assembly and preserve identifiers throughout storage and movement.
Review the applicable document scope
IPC-1601A is titled Printed Board Handling and Storage Guidelines; IPC-1602 addresses printed board handling and storage as a standard. These titles do not mean that every requirement for packaged components or a finished electronic product is covered by the same document.
Specify the exact applicable document and revision in the purchase or process requirements, and use the controlled document for its detailed provisions. Avoid citing a standard number as a substitute for defining the actual packaging, environment and acceptance obligations.
Establish a release decision after storage
Use inventory rotation and documented review dates appropriate to the materials. If packaging is damaged, exposure is unknown or storage has exceeded an agreed limit, hold the material for evaluation. Do not apply an arbitrary bake as an automatic reset of solderability or moisture history.
Agree any inspection or testing needed before assembly, and preserve the disposition record. For an inquiry involving stored customer stock, provide material age, packaging condition, exposure records and intended assembly process. Confirm the usable quantity and any qualification work before treating the stock as production-ready.