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March 2000

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Subject:
Coating of assemblies with no clean fluxes
From:
Grant Emandien <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 20 Mar 2000 11:24:40 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (47 lines) 
Hi all,

The debate on cleaning of fluxes as well as the use no-clean fluxes seems to
hang around forever. We have been informed by our solder an flux supplier
that assemblies with no clean fluxes can be conformally coated without the
need to clean the boards.

The argument is that the high temperatures of the reflow oven 'burns off'
the active ingredients, leaving only inactive residues. These flux residues
do not have to be cleaned and can supposedly be coated. The rep. believes we
are taking a backward step by possibly opting to use water-based flux. Is
this pure sales talk?

Is anyone able to offer any advice or insight, or been able to assess the
environmental and electrical performance of such assemblies.

Regards
Grant

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