Moisture-sensitive devices (MSDs) absorb moisture from the air. During reflow soldering, the rapid heating turns that moisture into steam, causing internal cracks—a defect known as the “popcorn effect.” This leads to latent failures or immediate device rejection.

The IPC/JEDEC J-STD-033D standard defines handling, packing, and storage requirements for MSDs. Among its key provisions: Once an MSD bag is opened, the devices must be used within a specific “floor life” (from a few hours to a few days, depending on the Moisture Sensitivity Level, MSL). If not used in time, they must be stored at ≤10% RH or baked before use.

For electronics manufacturers, a dry cabinet that maintains ≤10% RH is not optional—it is a compliance necessity. It allows you to extend the floor life of MSDs, reduce baking cycles, and eliminate popcorn defects. Storing MSD in a standard cabinet (e.g., 40% RH) is essentially non-compliant and risky.