Gosh, darn... I knew I didn't put enough "it depends" in there.
Without getting to far into commercial specifics, I agree that older UV
coatings were more brittle, but newer UV coatings are tending to be more
resilient.
"Easy to rework" can mean "poor solvent resistance" - you will need to
balance these two requirements for your application. On the other hand,
if you specify resistance to all known solvents, all known temperatures
and all abrasion, then do not expect to ever be able to remove it!
Your mileage may vary.
Peter
________________________________
Peter Swanson [log in to unmask]
<http://www.intertronics.co.uk/adhere/index.htm>
INTERTRONICS, Oxfordshire, England Tel: +44 1865 842842
INTERTRONICS <http://www.intertronics.co.uk/> 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 the latest news <http://www.intertronics.co.uk/blog/blog.htm> in
our blog!
________________________________
________________________________
From: [log in to unmask]
[mailto:[log in to unmask]]
Sent: 18 September 2008 15:58
To: TechNet E-Mail Forum; Peter Swanson
Subject: Re: [TN] NEW! DUAL-CURET 9481 ELECTRONIC CONFORMAL
COATING
I would generally agree with Peter, but the degree of protection
is very much an "it depends" proposition. We use 1B31 here and have
for a long time. I did to evaluations of Dymax 984 a number of years
ago, and I am sure the 9481 has advanced from when I did that testing 7
years ago. But one of the things that I found was that the material
was a blend of epoxy, acrylic, and urethane polymers. It gave almost
bulletproof for chemical resistance, had excellent adhesion, but when we
did thermal cycling, we had lots of cracking and peeling around the -55C
and -65C extremes, a place where UV cures have historically had
problems. We also found the material to be very hard to rework.
Again, I have not tested the 9481, but if you have to work in
worlds below -40C, or reworkability is important, then work that into
your evaluation plan.
Doug Pauls
Rockwell Collins
Peter Swanson <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
09/18/2008 08:18 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Peter Swanson <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] NEW! DUAL-CURET 9481 ELECTRONIC CONFORMAL COATING
Humiseal 1B31 is a single part, solvented acrylic coating, which
"dries"
(solvent evaporation) fully in about 1-7 days at room
temperature,
depending. Solvented acrylic coatings are very popular and
widely used,
in my experience.
In general terms, you will get more robust protection from a
coating
which fully cross-links, and this often means adding external
energy
(heat or light, etc).
Selection of the optimal coating depends on a number of factors,
including operating temperatures and working environments,
customer
specifications, electrical characteristics, reworkability and
even
production volumes and required process speed. No one coating is
necessarily better than another; horses for courses.
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: Reuven Rokah [mailto:[log in to unmask]]
Sent: 18 September 2008 14:06
To: TechNet E-Mail Forum; Peter Swanson
Subject: RE: [TN] NEW! DUAL-CURET 9481 ELECTRONIC CONFORMAL
COATING
Hi Peter,
Can you compare it with the 1B31?
Best Regards
Reuven ROKAH
e mail: [log in to unmask]
P Think green before printing this mail... Thanks
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Peter
Swanson
Sent: Thursday, September 18, 2008 11:40 AM
To: [log in to unmask]
Subject: Re: [TN] NEW! DUAL-CURET 9481 ELECTRONIC CONFORMAL
COATING
DYMAX 9481 is a single part acrylated urethane conformal
coating. It has
a secondary moisture cure mechanism (a bit like the cure
mechanism of a
single part RTV silicone) for those areas which are in shadow to
light.
The primary cure mechanism is still UV/visible light.
Traditional UV acrylic conformal coatings had a secondary
thermal cure,
so that's what makes this product new - if a secondary cure is
required,
there is no need to add heat, the moisture cure just happens
over time.
There are similar products from other vendors. This type of
chemistry is
a valid choice to evaluate for your coating requirements, but
much
depends on board geometry, application methods, requirements of
cured
material, etc.
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 Leigh-Ann
Litavis
Sent: 18 September 2008 01:10
To: [log in to unmask]
Subject: [TN] NEW! DUAL-CURE(tm) 9481 ELECTRONIC CONFORMAL
COATING
Hi Technetters,
Can anyone give me some information on this new Dynmax material?
Has
anyone used it? How does it compare to other UV materials that
are out
on the market today?
Thank you,
?LeighAnn Litavis
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