Bhanu,
I can appreciate the use of a pipette when it involves small parts such as SMT ceramic components. However, I want to dye a 29 pin dual row Backplane connector in which pad cratering is suspected. The pipette method is not suitable. I want to submerge the whole connector in Zyglo and heat as recommended then pull a vacuum and then oven dry, 67°C, for a few minutes before encapsulating. The proof is in the pudding!
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bhanu Sood
Sent: Monday, July 07, 2014 3:56 PM
To: [log in to unmask]
Subject: Re: [TN] Zyglow, ZL-67, dye penetrant
Victor,
Use a glass pipette to draw the heated Zyglo and pour on region of interest, when sufficiently covered, place inside vacuum.
I think 1 hour is too long, pressure seems right.
Bhanu
On 7/7/2014 2:47 PM, [log in to unmask] wrote:
>
> Bhanu,
>
>
> Heating sound very reasonable. Would you place the heated breaker,
> elevated temperature, with the sample inside in a vacuum vessel to ensure that
> the viscosity remains thin? In the past with Steel Rule Red Dkeem I would
> vacuum for about an hour at approximate reading of -20 In.Hg / 68kPa.
>
> Victor,
>
> -----Original Message-----
> From: Bhanu Sood [mailto:[log in to unmask]]
> Sent: Wednesday, July 02, 2014 9:25 AM
> To: Hernandez, Victor G
> Subject: Re: [TN] Zyglow, ZL-67, dye penetrant
>
> Victor,
> The heating is just to get the viscosity lower and make it flow better
> into the cracks, start with 40C in a beaker on hotplate and go up 5C
> increments to
> 50 max. You may want to check for changes in viscosity using a
> stirrer. VOCs may release above 50C, check the 67 MSDS.
> Bhanu
>
> 7/2/2014 9:37 AM, [log in to unmask] wrote:
> >
> > How much HEAT/temperature and for what length of time are we talking
> > about,
> 67ͧ°C.
> >
> > Victor,
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Bhanu Sood
> > Sent: Wednesday, July 02, 2014 8:19 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] Zyglow, ZL-67, dye penetrant
> >
> > Victor,
> >
> > Good application of Zyglo for PCBA level analysis. You can try a
> > slight heating before application to lower the viscosity for better
> > penetration, also try to pull a vacuum for better coverage. Lastly,
> > the Zyglo contains chlorine (sometimes excess of 900ppm) and sulfur,
> > so your EDS analysis on the mounts may show some of these constituents.
> Lastly, don't forget to send pictures.
> >
> > Good luck!
> > Bhanu
> >
> > On 7/2/2014 8:47 AM, Victor Hernandez wrote:
> > > 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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> > Bhanu Sood
> >
> > Center for Advanced Life Cycle Engineering (CALCE) Test Services and
> > Failure Analysis Laboratory Room 0128, Glenn L. Martin Hall
> > (Building
> > 088) University of Maryland College Park, MD 20742
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> Bhanu Sood
>
> Center for Advanced Life Cycle Engineering (CALCE) Test Services and
> Failure Analysis Laboratory Room 0128, Glenn L. Martin Hall (Building
> 088) University of Maryland College Park, MD 20742
>
> Tel: +1 (301) 405 3498
> Fax: +1 (301) 314 9269
> e-mail: [log in to unmask]
> Skype: calce_umd
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Bhanu Sood
Center for Advanced Life Cycle Engineering (CALCE) Test Services and Failure Analysis Laboratory Room 0128, Glenn L. Martin Hall (Building 088) University of Maryland College Park, MD 20742
Tel: +1 (301) 405 3498
Fax: +1 (301) 314 9269
e-mail: [log in to unmask]
Skype: calce_umd
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