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Solder Paste

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Solder paste is a material used in the manufacture of printed circuit boards to connect surface mount components to pads on the board. It is also possible to solder through hole pin in paste components by print solder paste in/over the holes.

Community > Groups > Solder Paste > Flat Solderable Tin as a PWB solderable surface finish
Flat Solderable Tin as a PWB solderable surface finish
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Fatih YASAR

Hello Everyone,
Our board supplier changed our board surface finish on a prototype to flat solderable tin (FST) because of the PWB thickness (.125"). The pads seem to be contaminated, particularly on second side pass through reflow. The solder appears to draw into the center of the pads. Has anyone any experience with this? I was wondering if our screen cleaner was affecting the process. It seems to leave a greasy film on the screen, but the instructions don't require a water rinse. Thanks in advance...
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