High temperature thread sealant

There are a lot of options for very high temperature thread sealants. Search on this term in Mcmaster for example.

However, teflon is supposed to go up to 500 deg. F. I am not an expert in air compressors, but I would think if the output air is that hot, something else might be getting damaged.

Okay, found one that looks good, and reasonable price (< $50 for 4oz), thanks.

At the 260°C is supposed to be maximum.. it's starting to get soft above about 150°C.. but point taken. There's an awful lot of power (several kW continuously in this case) going into a little bit of air.

Auto stores stock a variety of (usually Permatex brand) sealants in RTV silicone, including a variety of removable sealants. If you ever replace/repair threaded fittings, the nonremovable ones are not recommended.

I simply use a teflon based thread sealer paste readily available at any plumbing shop for ALL air connections, including those on the head end. I hate! Hate! finding tape bits blocking solenoids and valves downstream in CNC cabinets.

Gunner

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You would LOVE the crap one company uses on fire vehicles. It is some type of epoxy sealant. Does a GREAT job sealing and locking the connections together. BUT if any extra gets loose in the system....

Nothing like stepping on the brakes with an air brake system and having NOTHING because of a blockage. BTDT , I ripped apart the entire system and resealed all of it. Also installed a few filter screens in the lines.

I've used Permatex IIb non hardening, for auto gasket applications. Should work on threads. Messy, but alcohol cleans it off skin. Not much cleans it off clothing.

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Auto stores stock a variety of (usually Permatex brand) sealants in RTV silicone, including a variety of removable sealants. If you ever replace/repair threaded fittings, the nonremovable ones are not recommended.

BIG PROBLEM ON THE HORIZON!!! I did exactly what you are talking about and the temp from the output of the compressor was too high for the braid covered hose! The hose under the SS braid disintegrated. DON'T DO IT!

How about sealant for EGR pipe and oxygen sensor threads? Never-Seez perhaps? jsw

Hi, Tom, thanks for the warning.

This stuff is 300-series stainless on the inside too- no rubber. It's crinkled like a bellows so it's flexible and braided with stainless braid on the outside. It's not particularly cheap, but not insane.

Best regards, Spehro Pefhany

Greetings Spehro, If you want high temp sealant then try this link:

Thanks, Eric!

Best regards, Spehro Pefhany

I've used similar stuff at work to transport liquid helium. But it had two bellows -- one inside the other, and the space between them was evacuated to maximize insulation. Think of it as a long, flexible Dewar. :-)

But I have one short run of the what you are describing, which I intend to use to decouple vibration on a compressor from the pipes in the shop.

Enjoy, DoN.

I"m concerned that this is why head 'gaskets' are blowing out with this Alcohol gasoline we have now. New cars likely have something that handles dual fuels but not older cars and trucks.

Mart> I've used Permatex IIb non hardening, for auto gasket applications. Should

They also sell sealant for Wood stoves - it is high temp RTV and is red. I've used it on my wood stove - and it stands up to red hot temps.

Martin

Well, that's OK then! I would use Teflon, but I used a rubber hose. You might use a smear of hi-temp grease. As a lubricant, you will get the joint tighter.

Thanks, that is very handy to know about. I used to use a ceramic-based adhesive that required mixing and baking.

Your welcome. Let us know how well it worksplease. Eric

Had a closer look at one of those this morning (feeding a plane liquid He through a blowhole). They work very nicely- no frost on the outside.

I gotta ask: What is the liquid helium used for? What does it do? Was this a regular passenger plane or some military/experimental?

technomaNge