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December 2012

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From:
"Tontis, Theodore" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Tontis, Theodore
Date:
Thu, 6 Dec 2012 17:38:32 -0500
Content-Type:
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text/plain (111 lines)
No, it is for an industrial application

 

If you are using a no-clean process, confirm the process residues left
behind will not impact the potting material in a negative manner.
Something to watch for if and when you change your processes (solder
paste and or wave flux)

 

Ted T.  

 

From: Inge Hernefjord [mailto:[log in to unmask]] 
Sent: Thursday, December 06, 2012 4:16 PM
To: TechNet E-Mail Forum; Tontis, Theodore
Subject: Re: [TN] PCB assembly potted evaluation validation

 

Is it a MIL product?
Inge

On 6 December 2012 20:02, Tontis, Theodore
<[log in to unmask]> wrote:

Angel,

There needs to be a functional pre and post pot test. The Pre-pot test
will insure you are not potting defective material that you cannot
rework after potting. Post -Pot will identify any defects that might
have occurred during the potting process or defects they might have made
it through the previous screening process.

As for validation of the process itself it would depend on the end use
environment. Here are some tests I have used in the past to confirm a
potting process as well as process capability.

1. Water submersion testing in a pressure chamber to simulate water
submersions at different depths. (The product needed to function in
periodic depths of water up to 30ft)
2. Cross sectioning after potting to confirm 100% coverage of the
potting material as well as adhesion to the walls of the enclosure
3. Salt Fog and functional/cross sectioning
4. HALT and HAST testing

Regards,

Ted T.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Kraszewski
Sent: Thursday, December 06, 2012 10:05 AM
To: [log in to unmask]
Subject: Re: [TN] PCB assembly potted evaluation validation

Typically AABUS.  Function testing of some type based on purpose &
environment of the end use.
Some type of drop or HALT test might be nice.

Rich Kraszewski
(920)969-6075 <tel:%28920%29969-6075> 
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Reyes, Angel LAM2
4429
Sent: Wednesday, December 05, 2012 10:43 PM
To: [log in to unmask]
Subject: [TN] PCB assembly potted evaluation validation
Importance: High

Hello TechNetters;

Does any one know or recommend any test standard to validate performance
and reliability for PCB (FR4 0.031" THCK) double side SMT assemblies
potted with epoxy or polyurethane

Regards,
Angel

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