Solder resist paste and method of soldering

Metal fusion bonding – Process – Using bond inhibiting separating material

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Details

228215, 427259, 106 2, B23K 120, B23K 3102

Patent

active

046340394

ABSTRACT:
A solder resist paste having the feature that it is relatively easily removed is disclosed. The paste is comprised of a liquid polyglycol (e.g. Pluronic 25R2 by BASF) and either Kaoline or talc powder. In operation, the paste is selectively applied to holes in the PCB which it is desired to keep open during a soldering process. The paste is then washed out of the holes, additional components mounted via those holes, and soldered into place.

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patent: 4398660 (1983-08-01), Pampalone

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