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Epoxy resin pistons

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 resin pistons

Unread postAuthor: qwert123 » Sun Feb 27, 2011 2:46 pm

I have been told that epoxy resin will make a better piston than hot glue. When I make the piston, how should I prevent it from sticking to the mold? The mold is PVC pipe. Thank you for the helpful input. 
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Unread postAuthor: metalmeltr » Sun Feb 27, 2011 3:09 pm

Make sure the pipe is clean and smooth on the inside(Do not sand)
Wax the inside of the pipe with this.

Just rub on with a rag and wipe off the excess. The piston should pop out with a firm tap from a dowl or hammer handle. I have done this several time with great success.
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 27, 2011 3:23 pm

I've used automotive grease and even butter in the past, the important thing is that the surface is smooth and well smeared with something slippery. It should also be a perfect cylinder, one of the reasons why I favour casting in syringe tubes.
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Unread postAuthor: metalmeltr » Sun Feb 27, 2011 3:30 pm

The inside of pvc isnt always perfect so it may require a little gentle persuasion to remove the casting.
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Unread postAuthor: Major Collins » Wed Mar 02, 2011 4:44 am

yep im with jacksmirkingrevenge here go with grease , i use car bearing grease works like a charm.
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Unread postAuthor: qwert123 » Thu Mar 03, 2011 9:31 pm

Wow thanks! Just got a great piston from fiberglass resin.
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