Need Help finding Conductive Adhesive Film

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Discussion Overview

The discussion revolves around finding suitable conductive adhesive films or epoxies for repairing devices with ripped pad connections, particularly in the context of maintaining electrical conductivity under varying temperatures during soldering processes.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant describes a repair procedure involving conductive liquid or film epoxy, copper foil, and Kapton tape, expressing difficulty in finding a suitable long-working-time liquid epoxy or affordable conductive film.
  • Another participant suggests 3M's electrically conductive tapes and films as potential solutions, along with copper tape as an alternative.
  • A participant recounts an experienced engineer's surprise at the conductivity of copper tape's adhesive, raising questions about its reliability for circuit board adhesion.
  • Concerns are raised about the ability of copper tape to hold onto the circuit board under heat, with one participant noting that their previous attempts resulted in movement during heating.
  • One participant proposes soldering the copper tape to the board as a potential solution if the adhesive fails under temperature.
  • Another participant emphasizes the need for conductive epoxy or film to ensure adhesion and conductivity, questioning the effectiveness of soldering given the heat involved.
  • A participant inquires about the temperature requirements for the application, noting that most electrically conductive epoxies found are rated for 150°C (over 300°F).
  • Another participant mentions their soldering iron's adjustable tip temperature range of 350°F to 850°F (177°C to 454°C), indicating potential challenges with the materials' heat resistance.

Areas of Agreement / Disagreement

Participants express varying opinions on the effectiveness of different materials and methods for achieving reliable connections, with no consensus reached on the best approach or material for the specific application.

Contextual Notes

Participants discuss the limitations of available conductive adhesives, including working time and temperature resistance, without resolving the effectiveness of proposed solutions.

Devyn@2nd
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I have been repairing some devices but some of them have the pad connection ripped off so I can not repair the USB tips. I have found out how to repair the ripped connection which is the following procedure; Either a conductive liquid or film epoxy is put on the ripped connection area, then the copper foil or ripped off connection is placed on top, and lastly a piece of Kapton tape goes on top of that so it can cure or the film epoxy can be heated up correctly.

Now with this procedure I have a lot of devices so I have to find a liquid epoxy that has a long working time or the film and just cut out the pieces. My problem is I can not find a liquid that will last longer than a couple of minutes. I have been looking for a film that would work but it is either way too expensive or untraceable to find out how much it is to buy it.

Do you know of any conductive films that would be able to help me?
 
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I'm not sure exactly what you're looking for but 3M makes a handful of electrically conductive tapes and films.

http://www.tapecase.com/c.318.2.1/3m-electronic-products.aspx

Otherwise, there is always copper tape
http://www.tapecase.com/p.1201.351/3m-1126-3m-copper-foil-with-conductive-acrylic-adhesive.aspx
 
An experienced engineer I worked with was surprised that the adhesive on copper tape was conductive. He had been folding it under to ensure contact.
 
otto9K9otto said:
An experienced engineer I worked with was surprised that the adhesive on copper tape was conductive. He had been folding it under to ensure contact.

Yes but would it be able to hold on to the circuit board? I tried using copper with kapton and it worked. BUT every time I heated it up the connection moved. I was wondering even if I had epoxy, would it work or just heat the glue up?
 
Just a thought, but you could always solder the copper tape to the board if the adhesive won't hold under your temperature...
 
mdjensen22 said:
Just a thought, but you could always solder the copper tape to the board if the adhesive won't hold under your temperature...

Well I was asking about the epoxy/film because that would be the only way to get something to stick to the board with conductivity. If there was a connection I could solder the copper to to then I wouldn't be having this problem most likely. Even if I could do the soldering with copper, wouldn't it still move after being heated up. I can't seem to figure out a way for the pad to not move regardless because of the heat that will be on it.

If there is epoxy/ film it could melt and solder does the same.
 
What kind of temperatures are you looking at in your application?
All electrically conductive epoxies that I'm finding are rated for 150C (over 300 degrees F)
 
mdjensen22 said:
What kind of temperatures are you looking at in your application?
All electrically conductive epoxies that I'm finding are rated for 150C (over 300 degrees F)

Tip temperature is adjustable in the range of 350°F to 850°F (177°C to 454°C) for my soldering iron
 

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