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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
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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]
>
>
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_________________________________
>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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