Steven,

   When conducting a cross section of PTHs and SMT pads I observed pad cratering.   It appears that some of the epoxy media was sucked into the pad cratering/fracture/crack but hard to distinguish with a microscope.   With the fluorescence Zyglow, ZL-67, dye penetrant,  I hope that the dye will be sucked into the carves during the vacuum process, D&P.  Since the dye is visible with black light I hope that traces of the Zyglow will shine when the cross section is completed.   No harm in trying something NEW!

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
Sent: Tuesday, July 01, 2014 2:46 PM
To: [log in to unmask]
Subject: Re: [TN] Zyglow, ZL-67, dye penetrant

Victor,

I've used the various Zyglo UV dies to check for cracks in ceramic substrates & packages as well as checking for cracks in various Low Temp Co-fired ceramics, but have not had the opportunity to attempt to use it on a PWB laminate.

As 'penetrating' as that stuff is I would almost be surprised if it did not wick down the fibers on a cross-section of a good laminate....

Sometimes a Sharpie magic marker works very well too. Blue is always my favorite. Rinse/wipe with acetone or alcohol, as appropriate

Keep your hands clean!


Steve Creswick
Sr Associate - Balanced Enterprise Solutions http://www.linkedin.com/in/stevencreswick
616 834 1883




Original Message
From: Victor Hernandez
Sent: Tuesday, July 1, 2014 12:24 PM
To: [log in to unmask]
Reply To: TechNet E-Mail Forum
Subject: [TN] Zyglow, ZL-67, dye penetrant

Fellow TechNetters:

Has anyone use the above stated product in a PWB/PCB cross section to highlight cracks/fractures. Sometimes can be used to substitute Dykeem Steel rule dye.

Victor,



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