Thermal Epoxy

Mar 20, 2010 57 Replies

Not handy to bolt to the pipes at hand. But in the end, it did not matter. By my thinking, the LM-35 was heated/cooled by the pipe, and while better conductive epoxy sped up reaching the equilibrium state, it did not alter the fact it did get there. [The 35 was inside the pipe's insulation jacket...] There's some minor self-heating from the 35's expended power, but not much.

A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433

Compared to/with epoxy?

No. It makes the epoxy conduct heat better. Not as good as metallic beads/particles but still better than the plastic epoxy itself does.

It adheres well and does not degrade surface attachment contact areal density much. It works quite well, and if you call up the companies that sell epoxies, they will tell you that it is one of the fillers used across the industry. A basic proof is that even fiberglass filled plastic that has been made stronger by the fiberglass also has a better thermal conductivity number.

Doh! And it is an electrical, not thermal insulator, ya dope.

On your house, it only keeps the wind out. The pane itself is the same temp on both sides except where direct convective flow crosses it suddenly. This is why multiple glaze windows work so well, even though there is air in the gap, which is why they do not work as well as a vacuum gap glazing would. Don't see many of those. Alternate gasses and reduced pressure, but not many vacuum gap. Usually chemical desiccant in the separator bars too.

Try again, the interior of your skull appears BARE currently.

Silica is mediocre thermally. If the additive grains increase the thermal gap, they'll make things worse, not better.

Grain size matters a lot. If it's not very uniform, the occasional big grains establish big spacing, so the small grains float around in a sea of epoxy, which situation is rotten thermally. Additives can easily make things worse.

Cataphote sells "spacer grade" glass beads, carefully sorted for size and fairly expensive. They are good for establishing an insulating gap; mix just a little into epoxy and you get self-gapping. Rotten thermally. Like most gritty things, their regular retro-reflector-grade beads are all over the place on size.

Thermalloy makes a very nice green thermal epoxy, very strong and heat resistant, and with very fine-grain filler. Messy and labor-intensive like all epoxy.

John

We know yours... "Absolute Retard of Society"

Glass bead spacers are amazingly good at improving the dimensional stability of bonded joints. Any cement that shrinks at least a percent or so will keep the beads in contact with the two sides over a pretty wide temperature range. Good medicine for lots of optomechanical tasks, and you don't actually need that many in the mix.

Cheers

Phil Hobbs

Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net

I left out your true nym, "Coward."

John

Sand / glass is an insulator...

AlwaysWrong is so cute when he's outed. You may "only" be using 77 or so nyms, Nymbecile, but you've used a lot more and have no problems raiding mommy's hamper at any time.

I am not sure that it will be suitable to your situation, but there=20 are conformable heater tapes used for a variety of purposes. Such tape=20 may do what you need.

"but you've used a lot more" No, I haven't. They are all in the retard's list, retard.

THAT's a good idea. There are heater pads for the oilpans of small piston aircraft engines. They come with adhesive that you expose and then you apply the pad to the cleaned pan.

A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433

The plural of "retard" is "retards", not "retard's", DimBulb. ...and yes, you certainly are.

Moreof your grammar problems shine through. It was a possessive.

The retard Thompson's list.

I found a recent picture of him :

formatting link

Wrong, AlwaysWrong. You pointed to a list of retards.

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