Hi Franklin,
Ionic contamination has nothing with type of oxide preparation, only with
the quality of rinses.
From my own experience , we had in the past two types of oxides ( brown and
reduced black) and now we are running one of replacements - all types of
oxides passed ionic contamition tests nicely.
Edward
Edward Szpruch
Eltek Ltd
P.O.Box 159 ; 49101 Petah Tikva Israel
Tel ++972 3 9395050 , Fax ++972 3 9309581
e-mail [log in to unmask]
> -----Original Message-----
> From: Franklin D Asbell [SMTP:[log in to unmask]]
> Sent: ה דצמבר 05 2002 0:18
> To: [log in to unmask]
> Subject: Re: [TN] ionic contamination
>
> With that black oxide I don't see how they would pass ionic contamination.
> We use an oxide alternative (the exact chemistry I don't know the name of,
> the lab guys do...) and since we made that switch we've never had a layer
> even register on the contaminate scale.
>
>
>
> ----- Original Message -----
> From: Fineline Circuits, Inc. <mailto:[log in to unmask]>
> To: [log in to unmask] <mailto:[log in to unmask]>
> Sent: Wednesday, December 04, 2002 7:06 PM
> Subject: [TN] ionic contamination
>
> Hi Fellow Technetters:
> I would like to know if there is a process to clean inner layers
> for ionic contamination. Generally we drill, laminate, expose,develop,
> inspect, etch, blackoxide, bake and press inner layers. Its a multilayer
> board we are building for military and requires no ionic contamination
> between layers. (inner or outer).
> Regards
>
> Sona
>
>
>
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