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February 2010

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Subject:
From:
Mike Sewell <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Mike Sewell <[log in to unmask]>
Date:
Wed, 10 Feb 2010 07:45:27 -0600
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I've used Dymax 984-LVUF and would lose some fluorescence after curing,
but it was still visible.  Repeated curing would further reduce the
fluorescence. After adjusting to what was typical (and verifying coupons
for thickness) our inspectors were okay with it.  We manually applied it
in a spray booth that was fully blacklight illuminated, so coverage
verification was easy for the sprayer while the coating was still wet.
In addition, any reworked areas/components would be brighter than the
surrounding areas due to the thickness increase and shorter overall
exposure to the Fusion curing lamps.

Regards,
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Peter Swanson
Sent: Wednesday, February 10, 2010 4:47 AM
To: [log in to unmask]
Subject: Re: [TN] Fluorescent Tracers in UV Conformal Coating

I am not sure about heat sensitivity (I have never heard of this
problem), but you might have to look carefully at UV cured conformal
coatings if the UV (or black light) fluorescence is important to you.

Fluorescent tracers work by emitting visible energy in response to
UV/black light energy. The black light inspection lamps used are usually
low intensity, near-visible UV, and the visible light emitted is readily
seen, especially in dim ambient conditions. This is not permanent - the
visible response will become less and less over time as it is exposed to
light.

UV cured coatings use a high intensity, broad-band UV light to cure. The
strength of this may be enough to "burn out" the fluorescent tracer, or
make its response to black light quite poor. This is especially true
when the coating is exposed to "more than enough" curing UV light.

Luckily, some UV cured coatings are much more resilient to this than
others, and their fluorescent response is still very good after normal
UV cures. So include this in your testing when evaluating UV coatings.
Also, do not overcure if you want to keep the optimal fluorescence for
inspection purposes.

Regards,
Peter

--------------------------------------------------------
Peter Swanson           [log in to unmask]
INTERTRONICS               http://www.intertronics.co.uk
Tel: +44 1865 842842                Oxfordshire, England
 
INTERTRONICS is dedicated to providing quality material, consumable
and equipment solutions to the high technology, high performance
assembly industries, incorporating outstanding levels of technical
support and customer service.

Read our news! http://www.intertronics.co.uk/blog/blog.htm

INTERTRONICS is the trading name of Cygnet Electronics Ltd,
registered in England No 1835617. Registered office:
17 Station Field Industrial Estate, KIDLINGTON, Oxfordshire, OX5 1JD,
ENGLAND.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Kraszewski
Sent: 10 February 2010 00:42
To: [log in to unmask]
Subject: [TN] Fluorescent Tracers in UV Conformal Coating

I seem to recall some details regarding UV conformal coatings,  that
perhaps their fluorescent tracers are more heat sensitive and fluoresce
less than other non-UV conformal coatings. 

Can anyone substantiate or provide their experience?

Rich K 

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