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]> 
Sent by: TechNet <[log in to unmask]>
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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