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Date: | Wed, 27 Jun 2007 07:49:45 -0700 |
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Paul,
You should be able to use cleaning or plating solutions on your rigid
flex. If it comes apart you may not want to be shipping this to your
customer.
Results of your ROSE test will depend on the type of adhesive you used to
adhere your layers. Probably better results if you used a Polyimide no
flow prepreg, worse if you used WA acrylic adhesive that is typical of
flex circuit processing.
Chuck Brummer
3M Manufacturing Engineer
8357 Canoga Ave.
Canoga Park, CA 91304-2605
(818) 734-4930
Paul Baine <[log in to unmask]>
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06/27/2007 05:36 AM
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[TN] Cleanliness test for Flex PWBs
Hello all,
We are building a PWB Assy made up of both Rigid and Flexible PWB
components. We do not have much experience dealing with the Flexible
part; this Assy is a Customer design.
When we dealt strictly with Rigid PWB Assy's, we tested cleanliness using
the ROSE (Resistivity of Solvent Extract) method, where a solution of
alcohol and distilled water was sprayed over the PWB and the resistivity
of the resulting solution was measured.
Our Manufacturing Manager does not want to spray any solution containing
water over the Flex PWB section of the Assy because he is afraid that the
Flex PWB layers may separate. There is some evidence that he may be
right.
Does anyone have any experience with cleanliness test for Rigid Flex PWB
Assy's? There are no components on the Flex part of the Assy - it is used
as a "ribbon cable".
Paul Baine
Q.A. Manager
C-Tech Ltd.
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