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April 1997

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Subject:
From:
annie laberge <[log in to unmask]>
Date:
Mon, 28 Apr 1997 09:16:23 -0400
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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
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>Date: Thu, 24 Apr 97 17:12:46 cst
>From: "ddhillma" <[log in to unmask]>
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>Subject: Re: Solder bridging after wave solder
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>     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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