I am making an annealing "oven" for nylon rod out of a piece of 4" stove pipe wrapped in fiberglass insulation. The rods will be suspecded vetically in the pipe, and it will be heated with a heat gun from the bottom. Nylon anneals at ~ 350F, but the termperature will be a bit uneven, so places may get a good bit hotter. BEFORE EVERYONE GOES OFF ON A TANGENT ABOUT 16 DIFFERENT WAYS TO DO THIS, DON'T BOTHER. THAT'S NOT MY QUESTION. (Sorry, but I'm tired of everyone trying to ignore my actual question in favor of redesigning _everything_. I've had a cold for days, and I'm a bit testy..). I will support the pipe from the side with a chemical ring stand setup. To minimize the heat lost through the suspension system, I need something that is a good thermal insulator to go between the 1/2" diameter metal support rods and the stove pipe. My default will be threaded ceramic spacers, which I can pick up from Mcmaster Carr, but they are over $4 each. Not fatal by any means, but mildly annoying. If I knew of a good insulating material that could take the heat, I could machine the spacers myself, but the only plastic I'm aware of that is good to higher temps is teflon, but McMaster says it is JUST good to 500F. It's also not the best material from a mechanical rigidity standpoint. I have some & might try it, but I was wondering if there was some material that I'm overlooking. Thanks for comments & ideas. Doug White

Fairly loosely crumpled balls of aluminum foil, 1" od or so, if that fits. Use three to wedge the pipe into the ring. Conduction won't be nearly as bad as you think, and the price is right. ----- Regards, Carl Ijames I am making an annealing "oven" for nylon rod out of a piece of 4" stove pipe wrapped in fiberglass insulation. The rods will be suspecded vetically in the pipe, and it will be heated with a heat gun from the bottom. Nylon anneals at ~ 350F, but the termperature will be a bit uneven, so places may get a good bit hotter. BEFORE EVERYONE GOES OFF ON A TANGENT ABOUT 16 DIFFERENT WAYS TO DO THIS, DON'T BOTHER. THAT'S NOT MY QUESTION. (Sorry, but I'm tired of everyone trying to ignore my actual question in favor of redesigning _everything_. I've had a cold for days, and I'm a bit testy..). I will support the pipe from the side with a chemical ring stand setup. To minimize the heat lost through the suspension system, I need something that is a good thermal insulator to go...

axolotl wrote in news:k9vmc4$1i9$1@dont- Interesting stuff, but absolutely no indication where to buy it... Doug White

Machinable Thermal Insulator Good to > 500F?

Dec 07, 2012 23 Replies

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Doug White 13 years ago

axolotl wrote in news:k9vmc4$1i9$1@dont- email.me:

Interesting stuff, but absolutely no indication where to buy it...

Doug White

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axolotl 13 years ago

It is handled by industrial insulation suppliers- the people that would supply industrial boiler installations and manufacturing lines. Such as:

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Kevin Gallimore

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Martin Eastburn 13 years ago

I found that you call the factory as it is specialized material. If you can fit a 'standard' product - then the volume is needed...

Looks like they don't deal with you and me - but with builders needing volume.

Many products are like that.

Mart> axolotl wrote in news:k9vmc4$1i9$1@dont-

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Larry Jaques 13 years ago

330 pounds sterling for a cubic meter of foam? OUCH!

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