Anne,
We process a fair amount of double treat foil.  Our resist lamination and imaging
parameters are usually the same as standard ED foil.  For surface preparation and
stripping you need to pay close attention.  The others already warned you, no finger
prints, gloves are a must.  A warm acid soap cleaner is helpful.  NO MICRO ETCH.

When stripping the resist do not use caustic.  Caustic will stain the treatment, use
monoethanolamine/choline a few degrees hotter and not to much resist in the chemistry.

Good Luck
Call me if you need more.

Chuck Brummer
Acuson
818.734.4930

Anne Ledger wrote:

> Good Morning All,
>
> Today, I am tasked with gathering some research info on primary imaging
> of double treat multilayer material.
>
> We have experienced some staining and lock on situations in the past and
> I am looking for any input from board fabricators with any similar
> history.
> I understand that some of the newer treatments (Zbz?) have a similar
> appearance.  Appreciate all info, from TechNet or direct.
>
> Anne Ledger
> Process Engineer
> EMDS, Inc.
> [log in to unmask]
>
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