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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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epoxy

Unread postAuthor: shiny455 » Thu May 05, 2011 2:40 am

i was wondering what type of epoxy i should use on brass and copper and maybe where i would be able to find it. also would epoxy be able to handle maybe 500-600psi in 3/4 to 1 inch fittings? i would soldier it but its a bit hard to access a oxy setup
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Unread postAuthor: Crna Legija » Thu May 05, 2011 3:27 am

you can solder with a propane torch, but any high strength epoxy would work. also you could use just for copper.
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Unread postAuthor: jackssmirkingrevenge » Thu May 05, 2011 4:34 am

This is the sort of stuff you want: http://cgi.ebay.com/EPOXY-RESIN-MARINE- ... 41408e25c7

Of course it's important that your tubing can take the pressure too. I've found that for example the 1" copper tubing I use is fine for 500 psi or so but when you take it higher, it expands enough to pull away from the epoxy plug and start to leak. Wall thickness is important, especially for softer metals.
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Unread postAuthor: shiny455 » Thu May 05, 2011 4:50 am

thanks. im fairly sure the tubing will be strong enough, the only part that has a thin wall is the stirrup pump the chamber is really thick threaded tube. the marine epoxy costs 50 dollars to ship here so ill try find something similar in a store round here.
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Unread postAuthor: shiny455 » Thu May 05, 2011 5:05 am

would this or this be better?
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Unread postAuthor: Crna Legija » Thu May 05, 2011 5:15 am

use the edit button, yea they look fine but you can get it at any hardware store as well. you have to make sure roughen up the inside of the fitting and out side of the pipe, make sure theres no oil or dirt and let it cure for 24 hr
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Unread postAuthor: jackssmirkingrevenge » Thu May 05, 2011 6:16 am

I started out using West System and it's good stuff :)

Further to the above advice I suggest you read the how-to before getting started.
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Re: epoxy

Unread postAuthor: Ragnarok » Thu May 05, 2011 7:13 am

shiny455 wrote:I would solder it but it's a bit hard to access a oxy setup

If you're using an oxy rig for soldering, you're doing it wrong!
A butane torch of about 1 KW upwards (i.e. not some pathetic thing for making Crème brûlée or such ponciness) is usually more than sufficient to solder pipes in that size. Also, if both are done properly, soldering is much stronger than epoxy.
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Unread postAuthor: al-xg » Thu May 05, 2011 7:26 am

I'm guessing he meant brazing, an oxy kit on solder is a slight overkill indeed ;)

Be careful using high powered torches, copper will get very soft and bendy.
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Re: epoxy

Unread postAuthor: jackssmirkingrevenge » Thu May 05, 2011 7:34 am

Ragnarok wrote:not some pathetic thing for making Crème brûlée or such ponciness)


It's bit rich to criticise ponciness when you took the trouble to put in all the accents ;)
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Re: epoxy

Unread postAuthor: Ragnarok » Thu May 05, 2011 8:34 am

Criticising ponciness is no excuse for bad spelling. Also, it wouldn't have been poncy enough to criticise if it hadn't got all the diacritics*, would it?

*Technically, "accent" only refers specifically to one type of diacritic, as in the é, but not the è (which is a grave) or the û (which is a circumflex)
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Unread postAuthor: qwerty » Thu May 05, 2011 11:44 am

Ragnarok is very clever.

Anyway, any epoxy will do fine in my opinion, although, you can buy epoxy made especially for metal purposes.
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Unread postAuthor: Slyder2k8 » Thu May 05, 2011 10:59 pm

I know im new to the spudding community. But the epoxy i use is called "Sonic Weld" it is made especially for Metals. I forgot the temperature rating but i know it is rated up to 3500 psi. So it will hold together in almost any gun. And as JSR stated make sure your material will hold the pressure without expanding. Cause if it expands then all you have is a hella projectile. Or just major leakage.either way its not a good thing.
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Unread postAuthor: jackssmirkingrevenge » Fri May 06, 2011 6:05 am

qwerty wrote:Ragnarok is a ponce


Yeah, sometimes... but we can't hold it against him ;)

And as JSR stated make sure your material will hold the pressure without expanding. Cause if it expands then all you have is a hella projectile.


Trust me, I know ;)
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