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Great Stuff under pressure?

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Great Stuff under pressure?

Unread postAuthor: Vincenzo » Mon Dec 20, 2010 12:03 pm

I want to insert a piece of pipe in a fitting in the pilot of my 2" piston valve, and fill around it with Great Stuff. I am just not sure if it will be able to withstand the pressure? I will be using a max of 120 psi.
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Unread postAuthor: Hotwired » Mon Dec 20, 2010 12:54 pm

Helps if you tell us what it is.

I've checked and the most likely product seems to be insulation foam in a can...

No.

That isn't going to hold 120psi. A proper reducer/bushing is needed. You don't want to make the back of a 2" valve out of something you can poke your finger through.
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Unread postAuthor: jackssmirkingrevenge » Mon Dec 20, 2010 12:55 pm

Hotwired wrote:That isn't going to hold 120psi. A proper reducer/bushing is needed. You don't want to make the back of a 2" valve out of something you can poke your finger through.


Unless he's just using it to fill dead volume and not as a stressed structural component, in which case it should be reasonably adequate at those pressures.
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Unread postAuthor: ramses » Mon Dec 20, 2010 1:08 pm

Even to fill dead volume, it could be compressed. Any closed cells in the foam may fatigue and rupture. Then the foam would store air, but only absorb/release it slowly. Something like this I use caulk in my hybrid to fill dead volume, and it seems to work fine.
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Unread postAuthor: Vincenzo » Mon Dec 20, 2010 1:49 pm

On second thought, how about plaster of paris? There won't be any force on it and I'd coat the top of it with something else... Should I take a pic to show you guys what I'm trying to do?
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Re: Great Stuff under pressure?

Unread postAuthor: Selador » Mon Dec 20, 2010 2:59 pm

Vincenzo wrote:I want to insert a piece of pipe in a fitting in the pilot of my 2" piston valve, and fill around it with Great Stuff. I am just not sure if it will be able to withstand the pressure? I will be using a max of 120 psi.


Use the foam in the way that you wish.

But then cut away some of it, and fill the void left, with epoxy.

Vincenzo wrote:On second thought, how about plaster of paris? There won't be any force on it and I'd coat the top of it with something else... Should I take a pic to show you guys what I'm trying to do?


The foam is going to make for a lighter weight piston.

Yes, take the picture.
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Unread postAuthor: saefroch » Mon Dec 20, 2010 3:04 pm

I wouldn't recommend using great stuff on a spudgun, as it is quite a flimsy material. As a general rule for myself, I say if it's ghetto, it's a bad idea. It does however make for a pretty good target. Picture would help with suggestions of alternate materials.
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Unread postAuthor: Fnord » Mon Dec 20, 2010 5:40 pm

If in doubt, bondo.

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It's cheap and fairly tough.
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