Clearance Epoxy

[judgment_arms]

Hay all,
Do any of you know if this stuff will bond to PVC?
I’d like to know because the China-mart near me has it on clearance for 10 cents a pop!
Thanks.

[Matt221985]

china mart? lol, is that a real store?

[homedepotpro]

i would not put my well being on discount china-mart epoxy

[judgment_arms]

I call wall-mart, china-mart because every thing there is from china.
Well, I already got five of them; maybe I’ll try it and see.

[boilingleadbath]

If?
I'm pretty certain it will.

On the other hand, it may only have a 1,000 psi bond strength - or something like that... so you may not want to use it to epoxy fittings together.
Not that that changes anything, because we don't advocate that use anyways.

[judgment_arms]

Well I need something to plug the end of a piece of pipe from the inside. It woulcd not be under constant pressure, only for a short amount of time. Think of it as a breach block.
Would it work for that?

[boilingleadbath]

we need dimensions of the scenario:
Diameter of the pipe
Length of the epoxy plug
Pressure

[judgment_arms]

Okay then,
Pipe diameter = 1.5
Plug length = as much as necessary for safety.
Pressure = 120 max PSI

Pipe diameter = .75
Plug length = see previous, but no more than half an inch.
Pressure = 200 max PSI

[boilingleadbath]

If we presume those are .75" and 1.5" nominal (.802" and 1.59" actual inside diameter)...

1.59²* pi/4 * 120_psi = 240_pounds
240_pounds * 3_{safety factor} / (1000_psi * 1.59*pi) = .14"

.802²* pi/4 * 200_psi = 101_pounds
101_pounds * 3_{safety factor} / (1000_psi * .802*pi) = .12"

A couple notes:
1) These are thin enough that their strength as a flat plate may be lower than their ability to stay glued in the pipe... increasing their thickness would not hurt.
2) Required glue contact area (the values I calculated) scales liniarly with pressure.
3) A higher safety margin - like 6 or 10 - wouldn't hurt.

[iknowmy3tables]

that pipe is kinda big to be pluging with epoxy, you should use pvc parts, it you have a lathe try pluging that 1.5"pvc with part of a sanded 1" end cap and the 3/4"pvc with a .5" cpvc end cap