Instructables

Gluphite: Make A Key Chain Pencil

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Picture of Gluphite: Make A Key Chain Pencil
Gluphite is a fairly strong plastic made from glue. It can be used to make a small thin pencil that can be carried on a ring chain or in a wallet. It is cheap and easy to make and give as a gift.

The intro pic shows the pencil on a key chain.

 
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Step 1: How it Works

Picture of How it Works
Gluphite is a simple mixture of Gorilla Glue and carbon graphite. It hardens into a fairly stout plastic that has some interesting qualities including working well as a pencil body and lead.

Step 2: Materials And Mixing

Picture of Materials And Mixing
Materials
Gorilla Glue or Elmers white glue
Carbon Graphite available as lubricating graphite from a hardware store.
Corn starch
100% silicone caulk
Plastic mixing cup and mixing stick
Measuring spoon


Mixing Gluphite
Mix 3 measures of Carbon Graphite by volume with enough water to form a thick paste. Add 2 measures of white glue and mix well. Spoon the mix onto some polyethylene plastic on a flat surface. Spread it out 3/16" to 1/4" thick at a diameter large enough for the pencil.

Unfortunately I have not found a way to get it to set up faster, so it usually takes 3 or 4 days to totally harden up. While drying, it will shrink and warp a bit.

Because it has so much carbon which strengthens the plastic, it also works quite well as a pencil lead. It is hard enough to not rub off on your hands but soft enough to make smear less lines on paper that are light but very readable.


couldn't you just crush pencil graphite into a fine powder and use that?
but the idea is so the stuff doesn't go everywhere and so that you can carry it with you...
I think Madrobot meant using the crushed graphite as a substitute for the store-bought extra-fine graphite, not as a substitute for the keychain.
ya, unconventionalartist is right. so it should work right?
unless you're wiling to sacrifice a coffee grinder for the project I would say no. You'd end up with way too manny lumps in your mix.
Well, you could use a mortar and pestle, and that would grind it up pretty finely.
Actually, I think that would just coat your mortar & pestle in a smear of graphite, giving you far less actual powder than you would get for your dollar than just buying the stuff.
verdastel3 years ago
Cool instructable!

I am also interested in this sentence: "The white glue can also be mixed with corn starch or fine sawdust instead of graphite to create a hard carvable plastic that can be colored with oil or acrylic paints." 

Does it mean that i can make low-cost customized casing or prototype with the above composition? Won't the corn starch decay? Will the product be waterproof?

Once again, thanks for sharing this nice instructable!
mikey77 (author)  verdastel3 years ago
The starch does not decay, but the gluphite is only water resistant. It also deforms and shrinks as it dries.

For low cost prototypes and casings, I would suggest Oogoo which is waterproof and much easier to work with.
CaseBoy3 years ago
i say make a new design, cover it in some clear nail polish, and you got your self a cool surfing necklace
CaseBoy CaseBoy3 years ago
you know like those surf neckless.
awz123 CaseBoy3 years ago
lol?
awz1233 years ago
What the heck your writing with the wrong hand... *tisk tisk tisk* *leftys*
what an amazing idea! incredible!
Edgar3 years ago
Neat!