Dear all customers, Kindly reminding that the Chinese festival holiday in Weller is 1st Feb to 19th Feb and production will be closed then, please schedule your order beforehand to avoid any production delay due to our holiday.

Outer layer etch

This is simply a three step process.

The first step is to remove the blue dry film to expose the unwanted copper.

The second step is to etch away the exposed/unwanted copper but now the tin deposit acts an etch resist protecting the wanted copper.

The third and final step is to chemically remove the tin deposit leaving the pads and traces on the panel surface.

Then the tin is chemically removed leaving behind a bare copper and laminate panel. The surface pads, traces and plated through holes are the exposed copper. This is the last step in strip-etch-strip.