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epoxy questions

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epoxy questions

Unread postAuthor: rp181 » Sat Feb 02, 2008 6:09 pm

For a science fair, i need to make an electrolysis cell. Soudium hydroxide is the electrolyte, and i have 4 galv. steel plates. To make the plates stay together I tried magnets with insulation (oxidized), Hotglue (dissolved), Tape ( softens), Legos, and many other things. I was wondering if hardware store epoxy will withstand the strong base. I heard epoxy is more heat and chemical resistant if its cured in higher then room tempeture environments. If this is true, would a toaster oven or a regular oven work? What is the sugensted temp?
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Unread postAuthor: daberno123 » Sat Feb 02, 2008 6:13 pm

wow you tries to hold steel plates together with legos?

I would say get them welded together if epoxying them doesn't work. Best to wait until JSR arrives, i'm sure he'll know something i don't.

Good Luck on your science fair project
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Unread postAuthor: rp181 » Sat Feb 02, 2008 6:21 pm

I cant get them welded for 2 reasons : i dont have welder and they need to be insulated, otherwise short circuit. I was desperate, so i used legos to seperate the plates and rubberbanded it together =)
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Unread postAuthor: Hawkeye » Sat Feb 02, 2008 6:53 pm

The better specialty Epoxies are formulated to work under higher heat conditions or exposure to chemicals anyway. Better to use one of them in place of curing a lesser Epoxy in a higher heat environment.
The PC brand has a variety of types.
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Unread postAuthor: pizlo » Sat Feb 02, 2008 7:04 pm

Yup just get high quality epoxy, maybe marine epoxy. you shouldnt need special heating.
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Unread postAuthor: frogy » Sat Feb 02, 2008 7:42 pm

Marine epoxy is made to cure under-water... Regular 5 minute set/24 hour cure epoxy should work fine, but 60 minute set or more would probably be stronger...

Loctite sells some really nice epoxy rated for 180°C and it will cure at room temperature... Try looking in an adhesive store near you :P I'm not kidding, there are really adhesive stores :wink:
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Unread postAuthor: rp181 » Sat Feb 02, 2008 8:01 pm

High quality not gonna happen =) My local dollar store has 30 min. set epoxy, ile try that.
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Unread postAuthor: DYI » Sat Feb 02, 2008 9:17 pm

One thing that you have to learn is that doing something half-assedly the first time generally results in having to do it again. A little bit of planning and care in construction results in a much better finished product.

McMaster sells all sorts of epoxy, and have delivery times of under 3 days in the lower 48 states.
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Unread postAuthor: potatoflinger » Sat Feb 02, 2008 9:38 pm

You could also try JB-Weld, it would work very well. You would probably be able to find it at a local auto parts store for less than ten dollars.
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Unread postAuthor: frogy » Sat Feb 02, 2008 10:35 pm

He needs it to be insulated, JB Weld is conductive

McMaster is as expensive as hell... Try Lowes\Home Depot and find the strongest one... It should be about $3/4

McMaster is actually cheap if you need a lot of epoxy, but there minimum container is like 1.75oz, whereas normal epoxy is sold in about .85 fl oz.
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Unread postAuthor: rna_duelers » Sat Feb 02, 2008 10:39 pm

Pieces of glass?Not much eats away at glass.
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Unread postAuthor: Hawkeye » Sat Feb 02, 2008 10:39 pm

Is JB weld really conductive? Other similar use specialty Epoxies claim they are not. PC 7 etc.
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Unread postAuthor: DYI » Sat Feb 02, 2008 10:42 pm

JB weld is a conductive in the way that air is conductive, but even less so. Which is to say hardly at all. In conventional terms, it is an insulator, not a conductor.
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Unread postAuthor: Novacastrian » Sat Feb 02, 2008 10:42 pm

I didn't think that j-b would be conductive- well everything is conductive but just how conductive is j-b?
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Unread postAuthor: DYI » Sat Feb 02, 2008 10:44 pm

Nova, my post somehow answered your questions exactly before you even posted them :shock:
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