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From:
"Kane, Amol (349)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kane, Amol (349)
Date:
Fri, 29 May 2009 10:34:56 -0400
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Thank you very much Graham for your insights!....can you touch on the issue of whether dip coating is better suited to resist a salt fog environment as compared to spray coating? With all other parameters being the same, the only difference I can see is that dip coating method has more exhaustive coverage on the PCB as it can cover under components, which the spray coating method cannot.

Thanks again,
Amol



-----Original Message-----
From: Graham Naisbitt [mailto:[log in to unmask]] 
Sent: Friday, May 29, 2009 10:11 AM
To: TechNet E-Mail Forum; Kane, Amol (349)
Subject: Re: [TN] Humiseal 2A64 CC Experiences

Hi Amol

Do NOT attempt to dip coat with 2A64, unless you are happy to throw  
away the majority of it after around 4 to 6 hours.

This is a 2 part urethane, and 1 part is moisture sensitive.

Spray coating is your best option by far. If quantities to coat are  
few, then mix and spray as desired but the pot life when mixed is only  
a couple of hours before rheology and viscosity drift too far.

If quantities are high, then I suggest having each part mixed via a  
pump system complete with spiral mixer. This way you minimise wastage  
but the spiral mixer and pump circuit need thoro purging.

You might keep in mind that 1A20 was designed to replace 2A64 as a one  
part material with similar performance characteristics.

If I was you, I would stick with 1A33 - it will do all you want but if  
its not on the drawing, then 2A64 it will be.

Regards

Graham Naisbitt

Email: [log in to unmask]
Phone: +44 (0)12 5252 1500
Web: www.gen3systems.com

On 29 May 2009, at 13:34, Kane, Amol (349) wrote:

> Dear Technet Gurus,
> I am looking for any experiences you may have with the 2A64 coating.  
> We currently spray other urethanes (1A33, 1A20 etc), but not have  
> had any experience with this particular coating. Looking for info on  
> whether this is used in spray or dip application (the TDS says it  
> can be used in either, but is there a particular method it better  
> lends itself to?), any peculiar characteristics that other urethanes  
> from Humiseal do not have, general experience working with this  
> material.
>
> Also, which application method (spray vs. dip) is better to resist a  
> salt spray/salt fog environment? You can reply offline if you so  
> choose.
>
> Thanks in advance,
> Amol
>
>
>
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WARNING:  Export Control 
This document may contain technical data within the definition of the 
International Traffic in Arms Regulations (ITAR), and subject to the Export 
Control Laws of the U.S. Government.  Transfer of such data by any means to a 
foreign person, whether in the United States or abroad, without proper export 
authorization or other approval from the U.S. Department of State is 
prohibited. 
 
CONFIDENTIALITY NOTICE: 
This e-mail, and any attachments, is for the sole use of the intended 
recipient(s) and may contain information that is confidential and 
protected from disclosure under the law. Any unauthorized review, use, 
disclosure, or distribution is prohibited. If you are not the intended 
recipient, please contact the sender by reply e-mail, and delete/destroy 
all copies of the original message and attachments. 
Thank you.

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