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How much pressure can this safely hold?

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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How much pressure can this safely hold?

Unread postAuthor: Jose Arcadio Buendia » Wed Dec 25, 2013 8:28 am

How much pressure can this safely hold?
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I heated one side of a 3/4" sch 40 PVC coupling and inserted a soda bottle cap. After it cooled I took out the cap and applied epoxy to the coupling and cap.
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Re: How much pressure can this safely hold?

Unread postAuthor: PeteS » Wed Dec 25, 2013 9:02 am

Not sure, but I will say that I have mixed results with epoxying PVC. It helps if you roughed up the PVC pretty well.

That aside I bet it would be pretty strong, but would avoid standing behind it.
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Re: How much pressure can this safely hold?

Unread postAuthor: jackssmirkingrevenge » Thu Dec 26, 2013 7:15 am

This one with a similar joint was used to 100 psi without failure, but it does depend on the quality of epoxy used and part preparation.

I've also shot at closed water-filled soda bottles and the overpressure was enough to pop the cap off its threads.
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