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Via hole plugging

It is to plug the via holes by solder mask or by resin performed in a clean room.(Or fill the via holes with copper,which is another process).

How to do this? By screen printing to push soldermask into holes – a separate operation using an aluminium stencil.

WELLER perform the plugging criteria with 70% filling per hole. This is to eliminate the risk of “broken” circuit path after high temperature in assembly process.