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Immersion Tin

The immersion tin process has also been historically popular. 

It provides a consistently flat surface approximately 20-40 micro inches in thickness. 

This finish solders well, and is cost advantageous. However, finished PCBs have a limited shelf life and should be used within 3-6 months. 

Many PCB manufacturers around the world have this process in place.

 PCB surface finish list:

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