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Quick Question About Epoxy

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Quick Question About Epoxy

Unread postAuthor: e1337 » Wed Apr 02, 2008 11:22 am

Can a marine grade epoxy hold up to 1000psi? Also can it hold up to liquid CO2? And is it possible to turn on a lathe?

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Unread postAuthor: Carlman » Wed Apr 02, 2008 11:29 am

umm it all depends on what you are bonding really

as to lathe, maybe but why?
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Re: Quick Question About Epoxy

Unread postAuthor: jackssmirkingrevenge » Wed Apr 02, 2008 11:29 am

e1337 wrote:Can a marine grade epoxy hold up to 1000psi?


If it's thick enough, sure.

Also can it hold up to liquid CO<sub>2</sub>?


In terms of pressure, yes, but I'm not sure how it would be affected by temperature.

And is it possible to turn on a lathe?


Once fully cured, certainly.
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Unread postAuthor: ALIHISGREAT » Wed Apr 02, 2008 12:02 pm

i'm thinking a 1000psi piston cannon made entirely from reinforced marine grade epoxy :twisted:
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Unread postAuthor: psycix » Wed Apr 02, 2008 2:49 pm

Wouldnt it be wiser to take a piston made of alluminium in that case?
That one wont break.
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Unread postAuthor: e1337 » Wed Apr 02, 2008 3:25 pm

i'm thinking a 1000psi piston cannon made entirely from reinforced marine grade epoxy


I making a paintball gun made of scratch, I'm picking up my lathe this weekend and I ordered pipe off of Mcmasters and my reg/drop forward off of amazon. The gun's design is based on the Nelson pump (google it and it will have an animation). And I was thinking about making the innards (hammer, sear, bolt, valve seat, etc.) out of cast epoxy, also the grip, hopper, pump handle, and the body that goes around the pipe that hold the "stuff" together will be made of either red wood, cedar, or balsa with a shiny finish.

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Unread postAuthor: ALIHISGREAT » Wed Apr 02, 2008 3:31 pm

could be easier to machine it out of metal..... but i'm not sure, sounds like a cool project though.

Alasdair.
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 02, 2008 4:26 pm

hammer, sear, bolt


All things best made out of metal as it's more resistant to impacts and general wear and tear.
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Unread postAuthor: Gippeto » Wed Apr 02, 2008 4:30 pm

Do you really want to do this? :shock:

Do you have the tensile strength of the epoxy? You will need this to calculate the thickness of pressure bearing parts and for the strength of any threaded parts as well.

Then consider, have you mixed the epoxy PERFECTLY? Has it cured under ideal conditions? Any deviation will render your calculations useless.

Epoxy is generally used to hold the stress bearing members (glass or carbon fibers) in place, not to carry loads.

If you have some way of SAFELY proving the pieces, then go for it.

Otherwise, you are making a potentially fatal mistake. :(
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