Genny,
1) Most UV curing adhesives used in electronics are not epoxies, but
acrylic based. There are such things as UV cured epoxies, but much less
common.
2) As such, these UV systems are not normally used for repairs which may
be subject to the temperature from a soldering iron, where epoxy's
generic physical properties at temperature are higher than acrylic. Two
part epoxies are the standard product for this, like you use now.
3) UV adhesives cannot be used unless all of the adhesive is accessible
by the light. So, pad or track repairs are not generally suitable
applications. Similarly, laminate repairs might be possible as long as
there are no shadowed areas. A UV cured epoxy could be used for filling
a hole, but probably not for fixing a delamination.
4) UV adhesives are used commonly for things like wire tacking or
component staking or strain relief.
You can see some references here:
http://www.intertronics.co.uk/articles/light_cure_case_histories.pdf
I would suggest that you talk to DYMAX or Loctite, both of whom offer
matched adhesives and equipment.
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
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: 28 August 2007 18:06
To: [log in to unmask]
Subject: [TN] UV epoxy
A while back I asked a question regarding laminate repairs and mentioned
that we apply epoxy and bake.
A couple people asked why we don't use a UV curable epoxy. Good
question.
I have spent a bit of time looking around for UV curable epoxies, but
realize I don't know at all what I am looking for, and what equipment I
would need to cure it either.
Can anyone recommend some UV cure epoxies (brand/type) for fairly
standard FR4 materials?
Also, can anyone recommend UV curing equipment manufacturers?
Thanks all.
Genny
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