[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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