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: [log in to unmask] href="mailto:[log in to unmask]">Fineline Circuits, Inc.
To: [log in to unmask] href="mailto:[log in to unmask]">[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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