SMT Moisture Sensitivity Level Classifications and Floor Life Limits
Component floor life compliance requires strict tracking, verified moisture barrier packaging, and controlled bake protocols before surface reflow.
Dry Pack Inspection
Moisture Protection
Verification of sealed humidity barrier bags ensures that electronic components remain shielded from ambient water vapor during storage or transit. This dry pack inspection confirms that the vacuum seal on moisture barrier bags stays intact and that the internal desiccant packs remain active. Technicians observe the humidity indicator card through the transparent pouch to confirm that the interior environment holds the requisite dry state.
Any breach in the bag integrity or a color shift on the indicator suggests that the internal componentry risks oxidation or popcorn cracking during subsequent reflow soldering.
Label Verification
Validation of the printed information on packaging confirms that the moisture sensitivity level and the shelf life remain within defined parameters. This dry pack inspection checks that the caution labels correctly warn personnel about the sensitive nature of the enclosed parts. Correct markings prevent accidental exposure of parts to factory floor air for durations exceeding the allowable window.
Proper documentation on the bag exterior links the batch to the specific manufacturing date and the moisture floor requirements.
Seal Integrity
Testing of the heat seal on moisture barrier bags prevents atmospheric moisture from entering the controlled package. This dry pack inspection confirms that the sealing tool applied sufficient heat and pressure to create a hermetic bond around the perimeter. An improperly fused edge creates a path for gas exchange that renders the internal desiccant ineffective.
A failure in this secondary packaging stage results in a total loss of the moisture control standard for the housed components.