Preservation period and precautions for various surface treatments of printed circuit boards

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1. Considering the difference between product process and storage conditions, the printed board should be used in time (recommended within 24 hours) after unpacking, and it is recommended to pre-dry before use, especially the PI substrate in flexible circuit board. If patch welding is required, it must be pre-dried.

2. It is recommended to use the chemical immersion tin or immersion silver product within 12 hours after unpacking, otherwise it must be repackaged.

3. If the effective storage period is exceeded, the user can carry out the dry treatment and try it out: if necessary, some performances are re-tested and can still be used after passing the test.

4, usually save for more than 3 months before the machine patch to avoid the danger of moisture, need to be baked for 2 hours and 150 degrees.

5. Storage environment:

a. Good storage conditions: refers to indoor temperature conditions where the temperature is less than 25 degrees, the relative humidity is not more than 65%, and there is temperature control and no corrosive gas. b.General storage conditions: refers to indoor environmental conditions where the temperature is not higher than 35 degrees, the relative humidity is not more than 75%, and there is no corrosive gas.

So we can ensure the PCB assembly quality.