1. When you pack the printed circuit board, make printed circuit board in a dry atmosphere, avoid moisture entering into the package.
2. In order to reducing the deleterious effects of humidity in printed circuit board, you can put Desiccant in the same package of printed circuit board, when the moisture is rising, Desiccant will adsorb the moisture from atmosphere, hold particles of water to itself, and sustains a state of dryness (desiccation) in its vicinity.
3. In order to know how about the humidity in sealed package. You can put Humidity Indicator Card in the same package with printed circuit board together, you can know the humidity from Humidity Indicator Card directly. If the color of Humidity Indicator Card already changed in the required humidity, you will know printed circuit board is already damaged by moisture, and you will know printed circuit board can not e used again. If the color of Humidity Indicator Card is not changed in the required humidity, it means that the printed circuit board is available and you can use it again.