Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.

Reduce flux

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Reduce flux | 18 January, 2007

How to reduce flux contain on PCB after reflow process?

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Reduce flux | 18 January, 2007

Change pastes, although insufficient heating may leave excessive residues.

Is this on one board or all products? No Clean or water soluble? Do you profile accurately or "guesstimate" your settings?

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CK the Flip


Reduce flux | 18 January, 2007

If you are, in fact, running a No-Clean solder paste:

Different no-clean solder pastes will leave different types of (benign) residues. If your paste has been qualified from a Bellcore/SIR/Electromigration standpoint, any residues remaining will NOT ever cause problems in the field...EVER!

Some typical areas that flux residues pool up: 1.) Around chip components. 2.) Around fine pitch IC Leads.. 3.) The DPAK Heatsink area... etc..

Flux residues will also look... 1.) brown and gummy. 2.) flakey 3.) or gummy transparent..

Again it depends on the solder paste.

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Flux-Free Reflow Soldering