How does moisture in PCB affect production yields.

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Fast Super Dryer solving high-tech manufacturing problems.  IPC/JEDEC-J-STD-033C cover page 

Eureka Dry Cabinet prevents delamination/ blistering effects in PCB during high temperature reflow.

PCBs are moisture sensitive devices.

Advances in IC package design and manufacturing process allows much more components to be mounted in a smaller surface on multi-layer PCBs. But reliability of a finished PCB relies heavily on the proper moisture control beginning from the lamination process. If any trapped moisture are present during the reflow process, delamination, blistering and other defects will occur. But the question is, how far in advance must this be considered?

Proper Prepreg Handling

High humidity condition will cause moisture to be absorbed by the prepreg, especially when an open bag of prepreg is transported from cold storage to the processing area. This change in temperature will cause rapid moisture condensation on the prepreg. Best practice recommends allowing the prepreg to equilibrate to room temperature before the bag is opened. Some prepreg that does not require low temperature storage, can be stored in Eureka's dry cabinet at less than 50%RH until the material is needed for use. For prepregs that requires lower temperature storage, they can be stored in Eureka's dry cabinet while waiting for it to reach temperature. Assuring all excessive moisture are eliminated while decreasing the amount of harmful baking cycles the board needs to go thru.

Proper PCB Handling

PCBs are typically shipped in Moisture Barrier Bags (MBB) with desiccants and humidity indicator cards (HICs) inside to ensure it's quality. But once the PCBs are removed from the MBB for processing, natural moisture absorption begins. Some PCBs require mounting of devices of both sides. While waiting for the second side to be reflowed, moisture is also being absorbed. Depending on the ambient humidity levels and the length of exposure, moisture content could reach critical levels before processing is complete leading to higher chances of delamination. 

PCB delamination due to moisture PCB delamination from excessive moisture
 

Safely remove moisture while resetting floor life during storage with Eureka's SMT Dry Cabinet.

While baking the boards to remove moisture is an option. However, it comes at the cost of solderability, oxidation and intermetallic build up. Storing the unmounted PCBs in a nitrogen purge system is costly and will not reset the floor life. For the safest and most effective storage and proper handling of PCBs is to store it in Eureka's Ultra Low Humidity Fast Super Dryer.
Eureka's Ultra Low Humidity SMT dry cabinets are safe and effective methods for storing PCB, MSD, contact leads, solders and other moisture sensitive materials used in the electronic manufacturing. Eureka's dry cabinet will provide alternative moisture removal solution to standard baking oven and increase production yields, while producing higher quality and reliability products.

Eureka's SMT dry cabinets does not require nitrogen purge to function and is available in various sizes and moisture control capabilities.
Our XDC and SDC series SMT Dry Cabinets provides the most suitable storage environments for PCB and other moisture sensitive material in the production floor.
Ensure you're production line is protected from harmful moisture and increase the yield & quality of your products with Eureka's ultra low humidity SMT Dry Cabinets today.