Sounds like moisture in the fab...

How are they being baked prior to assembly?

Franklin




Barry Gallegos wrote:

> Dear Sirs, Madams, Guru’s.
>
> I have an assembly that we processed thru SMT and then thru the wave
> solder operations. Wave solder flux was with Alpha metals 856
> water-soluble. The assembly is exhibiting a white cloudy / milky
> appearance that looks almost as if the laminate/solder mask has
> changed color. No matter how much we wash this assembly, it will not
> go away.
>
> Is this due to possible moisture in, around or under the solder mask /
> laminate. What is it andis it acceptable.
>
>
> Any advice would be appreciated.
>
>
> Yours truly, (wana-be guru.)
>
> Barry Gallegos
>
> Western Electronics.
>
> 208-377-1557
>

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