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January 2004

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Subject:
From:
Matthew Park <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 22 Jan 2004 15:17:45 -0600
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I'm seeking input/confirmation about a problem I am observing for no
clean wave soldering process. The problem is a constant build-up of
white powdery flux residue in/around flux spray system. Our wave
operators remove the residue around spray nozzle every 2/4 hours with
brush/alcohol. It gets build-up quickly around the whole spray flux
system.

Boards that are wave processed have invisible white residue. It
requires a clean wipe to see some. This flux is alcohol-based no clean
with 2% resin as solid content. I am used to using alcohol-based no
clean with organic chemistry as flux activator and didn't have any issue
with white flux residue build-up.

J-STD-004 calls out four classifications of flux composition
(Rosin/Resin/Organic/Inorganic). Is white powdery residue build-up from
resin formulation in the flux we are using?

any thoughts?
thanks


Matthew S. Park
Preco Electronics
tel: (309)-263-7788
fax: (309)-266-6674
1651 N. Main Morton. IL 61550

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