Not metal but materials question

I have an AMERICAN HARVEST JET STREAM OVEN that I love and use daily.
After ten years the cover has developed a crack. I can order a new
cover and it will cost about $45 with S&H. I can get a new oven online
for around $125. However it would take three weeks or so to get a new
oven and the same for the new cover. I will probably order a new oven
but while I am waiting I would like to attempt a fix of the crack. Is
there a certain type of EPOXY that might work? The inside temperature
of the oven reaches 400F on the highest setting but touching the
outside of the cover during operation will not burn you.
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Hard to say without knowing more about the material and actual temperature the adhesive would be exposed to, but I'd be inclined to try RTV silicone. The regular silicone caulk is good to 350 or 400F, and some of the hi-temp grades tolerate up to 600F. Don't put it anywhere it'll be exposed to your food unless it's approved for that use -- some are.
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Ned Simmons
"Not burn you" probably means somewhere between 50 to 70 degrees C, if by "touching" you mean "lay your finger on it", not "touch it briefly". There should be epoxies that'll hold up to that -- in fact, I'd expect that JB Weld or epoxy from your local hobby shop would work for that just fine.
I'd be more concerned with what the cover is made of, whether epoxy would stick, and what you're planning on reinforcing the joint with, as just slobbering epoxy on cracked plastic rarely achieves a lasting fix.
Reply to
Tim Wescott
I decided to try a temporary patch using GORILLA tape on the outside of the cover. I placed the first strip of tape in a vertical direction covering the crack and then laid a second strip on top of the first in a horizontal direction. I used it this morning to cook some bacon strips using the 400F setting for about four minutes. Later I cooked a large baked potato at 300F for twenty minutes. So far the GORILLA tape is holding.
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I such circumstances I often contact customer service and ask if they can recommend anything.
Every once in a while you actually get to speak to some guy (it's usually a guy) who's been with the company for 300 years and actually knows something.
A pleasant experience indeed.
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Once, the apartment building I was in took a direct lightning hit. It broke almost everything - the exit signs in the halls were blown up!
Anyway, the TV kept working, but then I couldn't turn it off with the remote! I had to unplug it. So I called the repair place, and talked to a female tech! I explained that all I need is a diagnosis, don't do the transistor - I can swap out the tranny, I just need to know which one is the turner-offer by remote.
She was very knowledgeable and personable, and it was #35.00 instead of $100. :-)
Cheers! Rich
Reply to
Rich Grise
Objects held together by most common epoxies (including JB Weld) come apart when left out in the sun even if the joint is protected from direct UV exposure.
Here is a source of high temp adhesives:
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Michael Koblic, Campbell River, BC
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Hey Two-Guns,
I can't recall the name without googling and looking at the "Aircraft Spruce" website, but there is an RTV material that is reddish colour that is used around high temperature parts on aircraft engines. I went and looked:
bottom one on this page is good to 500F, stays sort of flexible
on this page, the first one is good to 600F, but look at them all, because one of them sets-up "hard"
The Permatex stuff in particular should be available at any good automotive wholesaler.
Take care.
Brian Lawson, Bothwell, Ontario.
Reply to
Brian Lawson
It's probably polycarbonate, it's commonly used for a cheap high- temperature(relatively) cover. Downside is that oils and fats will cause the stuff to craze and crack. Nothing you can do will stop it. So while you can probably patch the critter, it's on the downhill side. My college roommate had a Stir-Crazy popcorn popper that had a dome lid that cracked. I patched it with a chunk of pop can and some gun bedding epoxy. By the end of the year there was more aluminum showing than plastic. So you'd probably better order the replacement cover(or two if you really want to keep it).
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I'd drill the crack so it stops running. I've sewn cracks with wire. I'd order the new cover. Usually more cracks will be coming. Karl
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FWIW I made several molds from low-cost 2-part silicone purchased from eBay, not high-temp rated stuff. Poured molten lead into them. They don't seem to be damaged in any way and the lead peeled right out. Though I suspect that they'll deteriorate eventually as the process is repeated.
Epoxy is not recommended here. It's well-nigh impossible to get the mixture exactly stoichiometric, and the excess resin or curative may leach into the food.
If using food-grade silicone I would caulk both sides of the crack to key the silicone into the crack, so it won't fall out if the bond isn't too good. Though silicone bonds to a lot of materials very well. -- Best -- Terry
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