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This is an instructable on the best conductive glue I have been able to make that uses easy to obtain materials, glues well to most materials, is quite flexible and has a low resistance. Unfortunately for me, it uses a rubber or plastic mixture that I do not know the chemical composition of, so I cannot patent it.
There are many kinds of conductive epoxies, glues, and rubbers available. Unfortunately, they are for the most part quite expensive.
So, for more than four years, I have been trying every possible combination of likely elements, compounds, and solvents that I could get my hands on, in order to make my own truly affordable conductive glue. While I have found several that have excellent low conductivity, they tend to be quite brittle and have a tendency to crack. The conductive glue presented here does not have these problems.
Because this glue is quite flexible and you can vary its resistance, it has potential for different kinds of paint on sensors for robots or other devices. It should be possible to paint on strain gauges on the outside of a regular glove and use it for virtual reality or other control possibilities. Touch sensors and membrane switches can be painted on various flexible or rigid surfaces.
It can be used to paint on wires and resistors and as a glued solder joint. It can also be used to paint on strain gauges, temperature sensors, electromagnetic shielding, antennas, and push-button switches. I suspect, that with more experimentation, it may be possible to use it to create capacitors, diodes and transistors.
There are many kinds of conductive epoxies, glues, and rubbers available. Unfortunately, they are for the most part quite expensive.
So, for more than four years, I have been trying every possible combination of likely elements, compounds, and solvents that I could get my hands on, in order to make my own truly affordable conductive glue. While I have found several that have excellent low conductivity, they tend to be quite brittle and have a tendency to crack. The conductive glue presented here does not have these problems.
Because this glue is quite flexible and you can vary its resistance, it has potential for different kinds of paint on sensors for robots or other devices. It should be possible to paint on strain gauges on the outside of a regular glove and use it for virtual reality or other control possibilities. Touch sensors and membrane switches can be painted on various flexible or rigid surfaces.
It can be used to paint on wires and resistors and as a glued solder joint. It can also be used to paint on strain gauges, temperature sensors, electromagnetic shielding, antennas, and push-button switches. I suspect, that with more experimentation, it may be possible to use it to create capacitors, diodes and transistors.
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Signing UpStep 1Materials for the Conductive Glue and Circuit
Carbon Graphite, fine powder-Available in larger quantities at http://www.elementalscientific.net/
Available in smaller quantities at your local hardware store. It's called lubricating graphite and comes in small tubes or bottles. The brand I used successfully is called AGS Extra Fine Graphite, but no doubt there are other brands that will also work.
Performix(tm) liquid tape, black-Available at Wal-Mart or http://www.buytape.com
Mixing cups or glass container
1/4 and 1/2 teaspoon measuring spoons
Glass or plastic mixing rod
Cardboard for stencil
Toluol paint thinner (optional)-Available at most hardware stores.
Conductive thread (optional)-Available in larger spools at http://members.shaw.ca/ubik/thread/order.html It is available in smaller spools at
http://www.Inklesspress.com/electronic_parts_2.htm
Circuit materials of your choice
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Nice I can use this. Thanks.
The link http://www.Inklesspress.com/electronic_parts_2.htm
for smaller spools conductive thread doesn't work.
buytape.com does though, and its run by the same people
btw, love this idea!!
I have made the correction.
And let us know if you discover anything interesting.
Very well done. I'm sure you've played down a little bit, the many hours you have invested in this (it must have been a huge job doing trial & error on all possible ingredients & various ratios). That alone, makes you a true "stand-up guy" for posting this as an "open source" formula. Also, I imagine those Liquid Tape guys would have some issues if you tried to patten a formula made of 50% of their product :-) I just wanted to add my thanks as this is something that many of us will use often.
Are you familiar with Sugru? Lots of info on this site. I wonder what you might be able to create by incorporating it into your graphite formula? Maybe a custom sized & shaped 3D switch, resistor, or volt reg / potentiometer disguised as some decorative part of a project? A more HD pressure sensor? I see a huge novelty market for fun car accessories such as the OEM-looking shift knob. You wire it so that it delivers a (safe but meaningful) "zzaaapp" every time your kid dives the family car like a race car? Electric side moulding for those inconsiderate people who lean against other people's cars as if they were beach chairs. Hmmm, I wonder if they'd even mix in a useful way. Hey great job and thanks for making it available to all.
It works well in locks.
If you insist on crushing some graphite yourself, art stores sell sticks of pure graphite for drawing, and some good calligraphy boxed sets come with graphite and a little ceramic bowl for making black "ink".
I need to do some tests with it first...