Many suppliers of solder mask do compatibility testing with the
most popular fluxes. We normally conduct this testing every year
to keep the information current. 

Contact your current solder mask supplier to see if they can help
you with compatibility issues.

If you are unable to get this information, give me a call, I would be
happy to help you.

Bob Metcalf
Morton Electronic Materials
714-730-8356

>>> annie laberge <[log in to unmask]> 04/28/97
08:07am >>>
Hello Technet...I have a question regarding this discussion:

How can I know if a soldermask is compatible with a flux ? Do the
suppliers
of mask / flux have this information ? Or we probably need to do
some
tests...What kind of test ?

Thank you in advance



>Resent-Date: Thu, 24 Apr 1997 17:58:30 -0700
>Resent-Sender: [log in to unmask]
>Old-Return-Path: <[log in to unmask]>
>Date: Thu, 24 Apr 97 17:12:46 cst
>From: "ddhillma" <[log in to unmask]>
>Encoding: 52 Text
>To: [log in to unmask]
>Cc: [log in to unmask]
>Subject: Re: Solder bridging after wave solder
>Resent-Message-ID: <"dIt133.0.EbD.gozNp"@ipc>
>Resent-From: [log in to unmask]
>X-Mailing-List: <[log in to unmask]> archive/latest/12234
>X-Loop: [log in to unmask]
>Resent-Sender: [log in to unmask]
>
>     Hi Elizabeth -
>     
>     You might try investigating the compatibility of the
soldermask and 
>     the flux chemistry. I have found that the soldermask texture
(i.e. 
>     either shiny/smooth or matte/rough) and the specific flux
interaction 
>     is very important. The general industry trend is that shiny
soldermask 
>     will have more solderballs/bridging than matte soldermasks
but I have 
>     found that with certain flux chemistries I can use shiny
soldermasks 
>     with no solderball/bridging problems. Good Luck.
>     
>     
>     Dave Hillman
>     Rockwell Collins
>     [log in to unmask]
>
>
>______________________________ Reply Separator
_________________________________
>Subject: Solder bridging after wave solder
>Author:  [log in to unmask] at ccmgw1
>Date:    4/23/97 7:19 PM
>
>
>Dear Technet,
>I have a customer who is reporting bridging on the solder side
of the board 
>after wave soldering.  I have seen the boards, and they look
quite messy, 
>with solder sticking to the mask as well as between component
leads and 
>pads.  The mask itself is adhering nicely.  The mask is PC501
from Haven, 
>with C101 hardener.  This was recently discontinued by
MacDermid and picked 
>up by Haven.  The flux is no clean, ENFLUX NCF-8660, and is
under pressure 
>with nitrogen.  The wave itself is at 500 degrees F, with preheats
set to 
>get the board to 210 to 220 degrees F when it hits the wave. 
The same 
>design board with LPI ran fine, so I do not suspect a problem in
another 
>area of the process.
>     
>No other customers are reporting this problem, and I am at a
loss as to 
>where to investigate further. The customer is not happy, and
wants a 
>resolution today!  If anyone has any insights, please let me
know.
>     
>Thanks,
>Elizabeth Falk
>Process Engineer, Beaverbrook Circuits
>     
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--------------------------------------------------
Annie Laberge
--------------------------------------------------
Matrox Electronic Systems (MES)

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