Moisture Control
Protective packaging relies on sealed bags to prevent moisture absorption in electronic components during shipping and long-term storage. Inserting a desiccant pouch inside the moisture barrier bag keeps the internal relative humidity below the ten percent threshold. This control is necessary for surface mount devices that are sensitive to humidity and prone to damage during solder reflow.
The active clay or silica gel within the paper packet absorbs water vapor that penetrates the protective bag.
Storage Duration
Atmospheric exposure eventually saturates the drying agent and limits its protective lifespan. Saturated packets must be replaced or regenerated by heating according to the specifications of the manufacturer. When the humidity indicator card reveals that the moisture has risen above thirty percent, the desiccant must be replaced immediately.
This action prevents moisture from condensing on the component terminations.
Deployment Standard
Standard operating procedures specify the quantity of drying agent required based on the surface area of the bag. This calculation ensures that the internal volume remains dry for at least twelve months when stored in controlled warehouse environments. During the dry-packing stage of SMT preparation, technicians place the desiccant pouch in the bag and apply a vacuum seal to remove air.
The vacuum level must remain within limits that do not puncture the bag on the sharp corners of the component carrier tapes. Quality controllers inspect the completed package for seals that have failed or bags that have lost their vacuum.
