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From [log in to unmask] Tue Dec 10 08: |
50:54 1996 |
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Aydin Electro-Fab |
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[log in to unmask] wrote:
>
> SMOBC
> Funny, no one has thought to mention that it may be the
> Fabricator's application for the defect. Is that not a
> possibility?
>
> ______________________________ Reply Separator _________________________________
> Subject: Re: Soldermask peeling
> Author: [log in to unmask] at Internet
> Date: 12/9/96 7:21 AM
>
>
>
> Dan,
>
> I'm going to ask what might be an obvious question, is it SMOBC (Soldermask
> Over Bare Copper)? or did the surface layer get finished with tin/lead before
> soldermasking the fab? The only time I've ever experienced mask coming off in
> the wave was because of that. The plating is becoming liquidous and the mask
> loses it's adhesion. That's kinda' the direction I'm leaning because you say
> that the fab passes the tape test prior to wave.
>
> Let us all know if you figure it out, I'm a bit curious why that might happen
> if it isn't a plating beneath the mask.
>
>
>
> __\/__
> . / ^ _ \ .
> |\| (o)(o) |/|
> #------.OOOo----oo----oOOO.-----#
> # Steve Gregory #
> # [log in to unmask] #
> # #
> #________________Oooo.__________#
> .oooO ( )
> ( ) ) /
> \ ( (_/
> \_)
>
>
>
>
>
> >We recently experienced soldermask peeling after wave from three different
>
> >Fabricators all within 2 weeks. Subsequently we took sample lots of each
> >Fabricator and performed a pre-wave and post-wave tape test. In all lots
> >the boards passed pre-wave tape test but had a 10-25% failure post wave.
> >What can cause this phenomena? Does the weather change have anything to
> do
>
> >with soldermask application and durability?
>
> >Dan Hickey
> >Senior Buyer
> >Vicor
> >[log in to unmask]
>
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It wasn't mentioned, because it's not likley. Think about it. Is it
possible that 3 different suppliers could be sending you boards which
all have defective soldermask applications ?
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