Component stored in ambient environment(30 degrees C, 85%RH) for 25 hours.
Dehumidification: The component is stored in a McDry cabinet at 5%RH for 150 hours.
The component was baked and then stored in McDry at 5%RH. (Example of storage in a dry box at 5% RH specified by the new IPC/JEDEC J-STD-033B.1)
Example of low-humidity storage of laminated PCB
Multi-layered PCBs absorb moisture at a faster rate as they become thinner. Layer break off and blistering will occur during reflow if the moisture content of the PCB exceeds 0.2% (weight.) Store laminated PCBs in an ultra-low humidity dry box.
PCB (Glass-epoxy substrate)
Sample: 6-layered laminated PCB
Dimensions: 50 x 100 x 1t (mm)
Measurement condition
Pretreatment: Baked for 24 hours at 125℃
Humidification: Steamed for 2 hours
Dehumidification: Stored in McDry box at 5% RH
PBGA carrier board
Test Conditions
Pretreatment: 24-hour bake at +125℃
Component stored in ambient environment(30 degrees C, 85%RH) for 25 hours.
After process (1), the component is stored in McDry cabinet(5%RH) for 150 hours.
