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May 2013

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 8 May 2013 18:51:51 +0000
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For repair of lifted pads, no matter what epoxy is used, I put a couple of pieces of ESD-safe, low-outgassing polyimide tape over the pad and then lightly clamp it down in a deep-throat (leave it alone, Dewey) C-clamp to ensure it is properly aligned. Then I put the CCA and the clamp together in the oven to cure. The tape will not adhere to the adhesive, and leaves the whole area with a nice flat shiny coating of epoxy. 
It also keeps the epoxy off of the surface of the pad. Armstrong C7 with hardener "W" is the best epoxy I have found for repairs of this type.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Goodyear, Patrick
Sent: Wednesday, May 08, 2013 12:39 PM
To: [log in to unmask]
Subject: Re: [TN] 2-part epoxy for pcb repair

Wow amazing and timely, just got into a conversation with a fellow technician over this very subject yesterday.  He was looking at the film adhesives from Circuit Technology and I prefer to use a two part rapid set epoxy, due to the stated reasons.   

I believe the copy we have of 7711A/7721A recommends thermally bonded adhesives.   My issue is that when the land or pad is soldered to, the trace can shift or lift as the "glue" is heated.   I was originally trained using Loctite super glue with a liquid activator, however again when the area is heated the bonding agent sometimes releases.   I have had best results using BARCO BOND MB-165 quick set epoxy made by Astro Chemical, sets in 10-15 seconds, cures in a couple of minutes, I use their 100X product for board repair, it has longer working and cure times, on the order of 20 minutes, usually will mix in some shredded board when I need a large fill or strength and to color match.  

I know it isn't totally what you are looking for but may be an alternate.   

Pat    
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, April 24, 2013 1:43 PM
To: [log in to unmask]
Subject: [TN] 2-part epoxy for pcb repair

Good afternoon,

 

I am drawing an absolute blank trying to remember the 2-part epoxy that I've used in the past for PCB repair (sheesh)!

 

Can anybody refresh my memory? The little epoxy packets from Circuit Technology Center are pretty pricey. I remember that I used something else, but can't remember what it was?

 

Thanks!

 

Steve Gregory

 


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