I haven't used 9481 but I found the 984LVUF easy to rework compared to
say Conap 1155 two part UR. We did have some adhesion problems on
certain soldermasks - apply and cure okay, but would peel when
unmasking. The 1 part, no reduction, straight from the bottle
application was nice. Cure in seconds vs. minutes/hrs in an oven. The
thermal cure never rendered a hard coating underneath parts or heavily
shadowed areas - it would dry the coating to a soft but not tacky state.
I had some cosmetic issues with rework - you could burn through the
coating with an iron easily and perform component replacement but hand
cleaning of RMA resisues with IPA or Ensolve would leave scratches or
dull the surface. On the other hand, this was better than stripping the
entire board if it had 1B31. Stripping of 984 was easily done with
Techspray conformal coating remover if needed. Compared to other UR
coatings, you wouldn't get microbubbles if cured too fast. The UV
tracer was not as visible after cure as during application and not as
bright as 1B31. Touch-up spots would fluoresce brightly.
Regards,
Mike Sewell
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Thursday, September 18, 2008 9:58 AM
To: [log in to unmask]
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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