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July 2001

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Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 16 Jul 2001 17:00:53 -0400
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Alan,

Alpha 205R is what we used to use before we switched to Alpha Lonco 373 (an
OA flux).  We also got the white residue.  Our solutions was to change the
entire supply of flux in the machine.  Essentially this was a complete
cleaning if the fluxing system.  We also used small dams on the front of the
boards.  These would build up a layer of white guck that was like soap stone
in feel.  Cleaning this white residue off the boards was almost impossible.
Alcohol didn't want to touch it.  Scrubbing and buffing only made the
assemblers tired and frustrated.

Any chance of changing some of the flux or washing system or better yet
both?

Phil Nutting
Manufacturing Engineer
Kaiser Systems, Inc.

-----Original Message-----
From: Alan Kreplick [mailto:[log in to unmask]]
Sent: Monday, July 16, 2001 4:41 PM
To: [log in to unmask]
Subject: [TN] Cleaning No-Clean


Hello Technet,

Looking for recommendations on how to remove the white residue left from a
no-clean (Alpha 205R) rework process (mini-wave rework station) on a bunch
of boards, both in-house and out in the field.

The boards - single-sided pth - were wave soldered using Cobar no-clean
flux.  The boards have several aqueous incompatible components on them, so
cleaning the already built boards in an in-line or batch di-water system
with or without a saponifier is not an option (maybe a consideration for
new boards if the aqueous compatible parts are put on after wave).

Thanks in advance for the responses,

Al Kreplick
Sr. Mfg. Eng.
Teraydne, Inc.
500 Riverpark Drive
North Reading, MA 01864
Tel: 978-370-1726
Fax: 734-661-5352

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