We do a LOT of conformal coatings for military applications, mostly thermal
cure / two part applications...UV cure has all the problems that you speak
of. The material that we use has a UV tracer so that we can see problems from
the original coating operation....

In my opinion, UV cure coating ONLY, is not a good thing....

-Steve Gregory-


> Peter,
>
> I am semi-comatose now, so please, tell us what exactly are the advantages
> of UV curable coatings?
>
> Regards, Graham Naisbitt
>
> [log in to unmask]
> www.concoat.co.uk <http://www.concoat.co.uk>
>
> For instant access to Product Data Sheets register on the Tech-Shot area of
> http:// www.concoat.co.uk <http://www.concoat.co.uk>
>
> Concoat Limited
> Alasan House, Albany Park
> CAMBERLEY GU16 7PH UK
> Phone: +44 (0)1276 691100
> Fax: +44 (0)1276 691227
> Mobile: +44 (0)79 6858 2121
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Peter Swanson
> Sent: Friday, December 07, 2001 05:51
> To: [log in to unmask]
> Subject: Re: [TN] 2 Conformal Coating ?'s
>
>
> Graham,
>
> You really must see someone about your delusions over UV cured coatings,
> which are successfully used to coat many thousands of pcb's each year. I
> know someone who has a nice sofa you can stretch out on whilst you tell him
> all about it.... <g>
>
> Suitability for UV has nothing to do with 3D v. 2D, more to do with the
> complexity of the assembly geometry and the application methodology. These
> will determine if a secondary cure mechanism is needed for the application.
> In many instances (and with some of our customers), full cure is achieved
> just with light.
>
> Regards,
> Peter
> --
> --------------------------------------------------------
> Peter Swanson        [log in to unmask]
> INTERTRONICS            http://www.intertronics.co.uk
>
>    INTERTRONICS is dedicated to providing quality
>   material, consumable and equipment solutions to the
> electronics manufacturing and other technology based
>   industries, with the highest levels of technical
>            support and customer service.
>
>
> -----Original Message-----
> From: Graham Naisbitt [mailto:[log in to unmask]]
> Sent: 06 December 2001 16:52
> To: [log in to unmask]
> Subject: Re: [TN] 2 Conformal Coating ?'s
>
>
> Mike
>
> You would be better to go with a conventional coating. UV is not ideal for
> 3D objects - works great in 2D, cos you don't have to bend light! :-)
>
> I cannot remember what the operating environment was for your circuit - if
> you would care to repeat, I can recommend something - however, I am sure
> that a one part AR or UR coating from a reliable supplier will give you the
> best overall results - process and operating environment.
>
> Regards, Graham Naisbitt
>
> [log in to unmask]
> www.concoat.co.uk <http://www.concoat.co.uk>
>
> For instant access to Product Data Sheets register on the Tech-Shot area of
> http:// www.concoat.co.uk <http://www.concoat.co.uk>
>
> Concoat Limited
> Alasan House, Albany Park
> CAMBERLEY GU16 7PH UK
> Phone: +44 (0)1276 691100
> Fax: +44 (0)1276 691227
> Mobile: +44 (0)79 6858 2121
>
>
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Mike Manwell
> Sent: Thursday, December 06, 2001 02:41
> To: [log in to unmask]
> Subject: [TN] 2 Conformal Coating ?'s
>
>
> Hello,
> Thanks in advance if you have taken the time to read this!
>
> #1- Im trying different materials in a spray application. Both are cured
> using UV. One material does a "secondary cure" w/ moisture. This is cool
> because after 100 hours after UV cure, all material is fully cured.
> The other material Im trying uses HEAT for a secondary cure, or, if
> shodowed during UV cure, the material wont cure and never will. Obviously I
> dont want the stuff dripping or running anywhere, but being new to this
> wonderful process, just dont feel good about leaving uncured material on a
> product for it's entire life. Iv been told that you can "test" the product
> to see if the uncured material is causing a problem but Im not sure what
> type of test that would consist of. Any insight?
>
> #2- Has anyone out there ever installed refelctive metal plates in their UV
> oven to limit shadowing?
>
> Thanks so much,
>
> Mike Manwell
>