Message
Polyurethanes and acrylics are both used a lot.  Acrylics have the performance most people need and can be removed for mod or rework simply with localized application of a solvent.  This is both an advantage and disadvantage in that it indicates a low resistance to solvents.  Urethanes are tough with good performance , however, once cured, they can only be removed by burning or abrasion (scraping) for rework.  We use both and have applied them with selective coating equipment and by hand (spray and brush).  Drying can be in ambient air, conveyor oven or bake oven.  Solvent systems are the most forgiving (I think) but have VOCs. Waterborne also can work well but need a slower drying.  Urethane and acrylics are both available in 100% solids, UV cured versions.
 
George
 
 

 -----Original Message-----
From: Fred Pescitelli [mailto:[log in to unmask]]
Sent: Friday, June 06, 2003 8:52 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coating Systems
What is the preferred chemistry for conformal coating? I hear a lot are using Acrylic, is that Air dried?
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stolar, Paul W
Sent: Wednesday, June 04, 2003 5:16 PM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coating Systems

Both are very good systems. I bought a Nordson, just because I was used to the operating system. Both systems have their advantages.

 

Paul Stolar

Materials Engineer

Houston Technology Center

Baker Atlas

713-625-5376

713-625-4949 (fax)

-----Original Message-----
From: Noble, Ed [mailto:[log in to unmask]]
Sent: Wednesday, June 04, 2003 3:39 PM
To: [log in to unmask]
Subject: [TN] Conformal Coating Systems

 

Hello All,

 

    Looking for comments regarding Conformal Coating Systems.  I'm aware of several systems, seen a few, and narrowed it down to Asymtek/Nordson or PVA.  We'll be dispensing HumiSeal Acrylic Materials.

 

    Would appreciate any feedback from the masses.

 

Thank You and Appreciate Your Time,

Ed Noble

 

Process Control Supervisor

[log in to unmask]

Industrial Scientific Corp.

www.indsci.com

voice  412.490.1884

 

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