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March 2000

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From:
Hinners Hans Civ WRALC/LYPME <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 20 Mar 2000 14:43:45 -0000
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Hi Grant & Everybody!

I'll be surprised if you get to conformal coat without cleaning.

The other two people you need to check with are the conformal coating
manufacturer and your customer.  If they both said it was okay then you're
in business.

Don't forget IPC-A-610C section: 9.1.2 Defect - Class 1,2,3:
"Any foreign material that violates minimum electrical clearance between
components, lands or conductive surfaces."

I consider a non-conductive residue on a PWA as a defect (foreign material)
until I prove it otherwise - SIR, Salt Fog, . . .

Hans

~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Materials (Process & Manufacturing) Engineer
Warner Robins Air Logistics Center
Avionics Production Division
Manufacturing Branch
380 Second Street, Suite 104
Building: 640, Mail Stop: LYPME
Robins AFB, GA 31098-1638
Voice: (912) 926 - 1970 Fax: (912) 926 - 7164
mailto:[log in to unmask]
http://www.robins.af.mil

-----Original Message-----
From: Grant Emandien [mailto:[log in to unmask]]
Sent: Monday, March 20, 2000 4:25 AM
To: [log in to unmask]
Subject: [TN] Coating of assemblies with no clean fluxes


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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