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November 2006

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Subject:
Re: UV flourescent pens for rework identification.
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Thu, 2 Nov 2006 11:01:09 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (146 lines) 
Why halides? All ionic contamination is bad, not just halides. If the UV 
ink is water soluble, there is an easy test: Take a small PP beaker, 
rinse it out several times with DI water, along with the probe of a 
conductivity meter, then fill with the best DI water you can lay your 
hands on (pref <0.2 µS-cm). Dip the felt of the marker in it and gently 
stir the surface with it (do not cause turbulence). If the conductivity 
remains ± stable, then have no fear, it's OK.

If the ink is alcohol based, you can do the same but use a ~50% solution 
of IPA/water and start with a conductivity of <0.05 µS-cm.

If the solvent is non-polar, you will have to scribble on a demonstrably 
clean PP substrate, allow to dry completely, and repeat the second test 
above, but immersing the sample in the IPA/water mix for, say, 5 minutes.

Remember to run a control sample without ink for all the tests to 
establish a baseline for comparison, as there will be a rise in 
conductivity from CO2 absorption.

Brian

Jenny Drake wrote:
> Thanks for the quick replies. From what you are saying it looks like I
> will need to do some testing on a particular pen and ink to see if it is
> suitable for PCB's. If I buy just a general UV marker pen it could be
> chock full of halide ionics for example. Unfortunately I can't use a
> washable flux, or ink as the assemblies can't be cleaned. The PCB is
> part of a larger ceramic and stamped metal component, which has several
> cavities that would be nearly impossible to get water, or solvent out
> of.  
> 
> Regards,  Jenny
> 
> -----Original Message-----
> From: Kevin Glidden [mailto:[log in to unmask]] 
> Sent: 01 November 2006 21:04
> Subject: Re: UV flourescent pens for rework identification.
> 
>  http://www.blacklightworld.com/non%20porous%20pen.htm\
> 
> ???
> 
> Don't think this is made expressly for PCBs....not sure if it is
> conductive or not...
> 
> Kevin Glidden
> Manufacturing Engineer
> Astronics Luminescent Systems Inc.
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Dehoyos, Ramon
> Sent: Wednesday, November 01, 2006 3:22 PM
> To: [log in to unmask]
> Subject: Re: [TN] UV flourescent pens for rework identification.
> 
>         Hi Jen:
>                Use FluxMarker, P/N FM5WSO, a water soluble marker that
> comes in different colors. It works well and comes off easily. I am sure
> that you can find vendors through Google.
> 
>         Good Luck
>         Ramon
> 
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jenny Drake
> Sent: Wednesday, November 01, 2006 8:37 AM
> To: [log in to unmask]
> Subject: [TN] UV flourescent pens for rework identification.
> 
> Has anyone any experience using pens with ink that is invisible under
> normal light, but shows up under UV for identifying areas of PCB's
> needing rework?
> This would remove the need to place and remove stickers on the
> components and PCB and be invisible to the end customer.
> 
> Various pens are on the market for to let you mark your property, but
> there is no information that I've been able to find for their use on
> PCB's.
> Ideally I would want one that has been shown to be safe for use on
> electronics and have low ionic contamination.
> 
> Regards,  Jen
> 
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