Hi Frank,
Yes there has been some issues off and on in the past.
Yes certain dry film types cannot stand up to saponifiers (no matter who
makes the juice), semi-aqueous solvents and even high pressure spray have
all been the culprit?

However the I believe the majority of problems can be traced back to how
they are processed at the board level.
On LPI type masks the UV cure has a big impact. (testing has been done to
prove this)
Try to rush this step and you will see issues like the green turning ghostly
white. The wash step basically exposed the defect. I have seen hot water
alone cause this "Casper effect".

I believe Steve G. has seen this come and go in the past. A CM will get 10K
boards made and the problem shows up on less then 1%.

I have also seen on one occasion where the mask was lifted by the reflowed
solder wetting up under the mask following the trace and causing it to lift
or bubble. Then when exposed to spray wash it blew it off.(I have pictures)
This is definitely a problem at the board level. Once again the wash step
exposed the defect.

To see the sporadic nature of this problem, search the [TN] archives.

Frank if you have further questions, do not hesitate to call.

Best regards,

Charlie Pitarys
Director of Application Technologies
603.622.2900 X-115
www.kyzen.com







-----Original Message-----
From: Franklin D Asbell [mailto:[log in to unmask]]
Sent: Thursday, April 10, 2003 5:40 PM
To: [log in to unmask]
Subject: [TN] Sapponifiers and no-residue/no-clean fluxes


Any of you had experiences with sapponifiers affecting solder mask
integrity?

Franklin

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