- Do we need to Dry or do we need to Store?
We need both. Most of the time assemblers do not know how much moisture has been absorbed by their components or PCB’s, so they must be returned to a known state. A drying cabinet can reset the floor life clock back to Zero without inducing oxidation and inter-metallic growth caused by high temperature baking. The drying cabinet combines <0.5% RH with low heat (45-55C) to provide drying times that rival high temperature baking but without the dangers. (download “Reference Conditions for Drying”)
Depending upon WIP flow, if components and PCB’s are subjected extensively to open air before soldering, a storage cabinet is required. Whereas a drying cabinet must hold the average humidity, including regular door openings to 1%RH, a storage cabinet must maintain the average humidity (including regular door openings) below 5%RH to stop the floor life clock (IPC/JEDEC J-STD-033) Continue Reading ->