Can acrylic glued to PVC withstand pressure?

[limbeh]

Hi,

I'm planning to buy 6mm thick clear acrylic sheet, cut it into the required shapes, and glue it to some PVC pipe (5.5mm thick JIS VP- can withstand pressure) to make a piston. I will probably use either epoxy or multipurpose cement to glue them together.

Anyone got any comments to whether this is safe enough to withstand 8 bar / ~ 120psi pressure difference?

Sorry to bother you guys again with dumb questions, but I can't test it out for myself. I live in Singapore and my brother's a policeman, so I can't afford to have any exploding chambers because I can't hide them.

Thanks.

[CasinoVanart]

Limbeh, can you give a few more details in regards to the shapes you want to cut, i don't quite get what you mean about the piston- i think that stuff like contact cement would work for bonding the two materials but i need clarification.

edit:spllig

[limbeh]

The piston is in the shape of a cylinder. The pipe forms the cylinder while 2 circular acrylic disks will be used for covering the 2 ends of the cylinder.

The diameter of the disks is about 4 inches / 10cm.

Thanks.

[CasinoVanart]

If you are using the acrylic as end plates for a piston the chamber will not be subjected to any extra stress because of the fact, how you hold the plates to the end of the piston is the problem?
I am not sure i understand your problem

Edit: A digaram would be useful

[Insomniac]

Is this a piston for use in a piston valved pneumatic? If so, the piston really isn't subjected to much pressure (although if you use a sealed hollow piece of pipe as a piston, it will have external pressure, but this isn't a real problem) Would you mind drawing up a diagram of what you want to make? Just use paint or somthing, it will help us work out exactly what you are asking.

[limbeh]

Hi,

Here's the design.

Pretty simple actually. A simple cylinder. Only question is whether PVC can be glued to acrylic and withstand pressure difference of about 8 bars.

The inside of the piston should be hollow, unless it can't withstand the pressure difference. Which in that case I will probably just fill it up with silicon sealant.

Thanks.

[jackssmirkingrevenge]

The right epoxy prepared well and applied to a properly prepared (roughened and cleaned) surface will do the job.

[brogdenlaxmiddie]

THE EPOXY GOD HAS SPOKEN! hahahaha, but seriously, you'd be fine with your design, just don't forget the bumper!

[MrCrowley]

The pressure isn't the problem, it's the bumper. As long as you have a good bumper you'll be fine.

[limbeh]

As expected, the very mention of epoxy brought jackssmirkingrevenge out - precisely who I'm looking for.

Jacksmirkingrevenge, from your experience, do you know if marine epoxy is better than normal Araldite epoxy?

I suppose 3mm thick 75 deg rubber isn't soft enough as a bumper. I'll probably be using a lot of old mousepads instead.

Thanks!