Moisture Barrier Bags (MBB)
SCS Dri-Shield® Moisture Barrier Bags are intended to protect electronic items such as Surface Mount Devices (SMD's) from moisture and electrostatic damage during manufacture, transportation, and storage. They protect their contents with specialized layers of film that control the Moisture Vapor Transmission Rate (MVTR). Surface mount devices need to be kept dry between the time of manufacture and the point of reflow soldering.
When choosing a moisture barrier bag there are two main specifications you need to consider, the puncture resistance and the Moisture Vapour Transmission Rate (MVTR). The lower the MVTR the more effective the bag is at preventing water vapour from being transmitted. It is the Foil, high barrier bags (Dri-Shield® series 3000, 3400 and 3700) that have the lowest MVTR, and that meet IPC/JEDECJ-STD-033 requirements. The puncture strength or resistance captures the maximum weight the static shield can withstand before puncturing. Puncture strength is measured in pounds.
Most manufacturers of Moisture Sensitive Devices (MSD) will dictate how their product should be stored, shipped, etc. However, the IPC/JEDECJ-STD-033C standard describes the standardized levels of floor life exposure for moisture/reflow-sensitive SMD packages along with the handling, packaging, and shipping requirements necessary to avoid moisture/reflow-related failures.
For help in selecting the right Moisture Barrier Bag for your application, visit our selection guide.