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Let's Talk About Teflon Tape

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In The Doghouse

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With this discussion I've learned a lot about Teflon tape. Thank you.
It seems I've been mostly using it correctly. 3 to 4 layers and keep it off the end so it doesn't get inside the piping. What I wasn't doing well was wrapping it tight, so it pulls down into the threads. Going forward I'll do that better.
I'm going to read through this again to figure out the best brand to purchase.
 
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WWheeler

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How many wraps needed really depends on how thick the tape is. Company bought us some one time that must have been on sale, no branding on the rolls, and they were so thin it was see-thru AF and all but impossible to unwrap from the roll. IF I was able to unwrap it without it tearing over and over 20 wraps was about the bare minimum.

I prefer the thick stuff ≥4mil, 2-3 wraps
 

Schurkey

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Almost all my thread-sealing is done on automotive applications. Some, but not a lot of household water and gas plumbing.

"Tape" of good quality--and there's a lot of **** out there--is fine especially on cheap Chinese black-iron pipe that's been threaded at high speed with worn dies by twelve-year-olds on the night shift. "Tape" of any kind will NEVER be used by me on an automotive application. It shreds on disassembly, and gets into trouble "downstream" from where it's been applied. Bad enough on cooling systems, potential serious problems on fuel and oil systems.

On automotive uses, Loctite/Permatex anaerobic (hardening) thread sealers are all I will use. The "592" is readily available in parts-stores, works GREAT, and doesn't cause problems on disassembly. It's the same as the GM-recommended sealant except for the GM-branded tube it comes in. (i.e., "OEM-Specified")

71JM6nUMAmL._SL1500_.jpg
So far as I can tell, there's not a bit of difference between Loctite 592, and Permatex 592.

592, 567, 565 are all similar products with the same characteristic smell. There's a Chapstick-like semi-solid version, and there are other part numbers for still more variations. They harden like Loctite thread-lockers on "active" metal--steel, brass, etc., but with low-strength bond so it's easily disassemble-able. You'd do well to use a Cleaner/Primer when screwing into aluminum or other "inactive" metals.

61klVVl5+eL._SL1200_.jpg

DO NOT confuse ordinary, solvent-evaporating "Teflon" "PTFE" pipe dope with ANAEROBIC-HARDENING pipe thread sealer. The common brush-top bottle of solvent-evaporating **** is lower-cost, lower-performing.
 

Beerhippie

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....




So far as I can tell, there's not a bit of difference between Loctite 592, and Permatex 592.

592, 567, 565 are all similar products with the same characteristic smell. There's a Chapstick-like semi-solid version, and there are other part numbers for still more variations. They harden like Loctite thread-lockers on "active" metal--steel, brass, etc., but with low-strength bond so it's easily disassemble-able. You'd do well to use a Cleaner/Primer when screwing into aluminum or other "inactive" metals.

61klVVl5+eL._SL1200_.jpg
Loc-Tite and Permatex are now the same company--or part of the same company.

Also adding that galvanized steel is considered"inactive" and needs primer for any Loc-Tite type application--sealing or locking.
 

Leon bee

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I've used the anaerobic gasket products, but how do you use the primer with this thread sealer? Like with headbolts? Just spray each bolt before applying the sealant?
 

Firebrick43

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Loc-Tite and Permatex are now the same company--or part of the same company.

Also adding that galvanized steel is considered"inactive" and needs primer for any Loc-Tite type application--sealing or locking.
Loctite is owned by henkel and permatex is owned by ITW. Not the same company
 

KnurledNut

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Henkel owned them both from 1997-1999.

"Henkel, an international manufacturer of chemicals, detergents, industrial adhesives, and cosmetics, was no stranger to Loctite's management. At Loctite's request, Henkel had purchased a 35 percent stake in Loctite to thwart a hostile takeover launched by AlliedSignal during the mid-1980s. In November 1996, the DM 14-billion-in-sales German conglomerate proposed acquiring the 65 percent of Loctite it did not already own, presumably to strengthen its position in the U.S. market. Henkel's adhesives business, which generated DM 2.4 billion, or US$1.5 billion, was nearly twice the size of Loctite's entire business, making for a powerful combination in an industry undergoing consolidation. Unlike the proposed takeover by AlliedSignal, the takeover by Henkel was "friendly," embraced by Freeman and other senior executives who were expected to remain at Loctite once the deal was completed.

Henkel concluded the acquisition of Loctite in January 1997, marking the beginning of a new era for the Connecticut company. Loctite was organized as a Henkel subsidiary with Freeman serving as both chief executive and chairman. Substantial changes were in the offing as Loctite pressed forward under Henkel ownership, highlighted by the decision made in 1999 to abandon the automotive aftermarket business. Loctite sold the business to PBT Brands, Inc., deciding that its resources were better directed at its core industrial business. Along with the divestiture, the company's corporate headquarters in Hartford, Connecticut, were sold, with the remaining functions of the Hartford site consolidated into Loctite's Rocky Hill, Connecticut facility, which subsequently became the headquarters for all business conducted in North, Central, and South America. As part of the consolidation, Henkel informed Freeman he was being transferred to Dusseldorf, a move the Loctite executive avoided by resigning at the end of May 1999. Freeman's departure left Loctite facing the new century ahead with new leadership. Heinrich Gunn, president of Loctite's European group, became the company's new chief executive. As Loctite entered the 21st century, with Gunn in Dusseldorf alongside Henkel executives, its future role as an elite adhesives and sealant producer was secure, firmly rooted in decades of technological innovation."
 

Fedwrench

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I was surprised to see this much interest in Teflon tape, can't stand the stuff myself. I've used Permatex/Loctite/Vehicle OEM thread sealant goo for years. :beer:
 

KnurledNut

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Well, we have made it this far without a single mention of DuPont or Chemours.
So it has to be said: Genuine Teflon tape no longer exists.
The trademark holder no longer manufacturers any products in tape form.
We are obsessed with brand names. “Jim bob, hand me the PTFE tape,” just doesn’t have the same ring.
 

Beerhippie

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Band Aides, Q-tips, Loc-tite, Vise Grips, Crescent Wrenches.... the list goes on. Just gotta get over it if you can't prevent your trademark from becoming vernacular.
 

Beerhippie

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There are some positive sides to using Teflon tape.

For instance, this fitting:

54426937308_5744b72c21_b.jpg

which has been untouched for 13 years and obviously didn't live in a nice neighborhood, came off with relatively little effort--just my weight on a 24" pipe wrench. If I'd used anything other than heavy-duty tape back then, I expect it would have been a struggle.
 

Schurkey

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It's not like the tape, and only tape, was responsible for a successful removal.

The Loctite/Permatex products also advertise non-galling, and by sealing-out contamination between the male and female threads, the parts would be similarly easy to remove.
 
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Beerhippie

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It's not like the tape, and only tape, was responsible for a successful removal.

The Loctite/Permatex products also advertise non-galling, and by sealing-out contamination between the male and female threads, the parts would be similarly easy to remove.
The Gold End paste we used to use was extremely hard to remove without plenty of heat.
 

SouthernIllinois

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I used this on the black pipe fittings and the aluminum Transair fittings in my pole barn.

I'm no pipe fitter and was very nervous when we pressurized the air plumbing for the first time last night. Over 50 fittings taped and doped - a lot of sources for leaks

Not a single leak when we put 165psi on it.

I shut off power to the compressor and Isolated the air piping at the compressor - the next morning it hadn't lost a drop of pressure.

I know it wasn't my skill putting it all together so it must have been the tape and dope.

FWIW, I taped first and then put the dope on the fittings (a plumber friend told me to do it that way)

Screenshot 2025-04-02 at 4.38.38 PM.png
 

Beerhippie

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I used this on the black pipe fittings and the aluminum Transair fittings in my pole barn.

I'm no pipe fitter and was very nervous when we pressurized the air plumbing for the first time last night. Over 50 fittings taped and doped - a lot of sources for leaks

Not a single leak when we put 165psi on it.

I shut off power to the compressor and Isolated the air piping at the compressor - the next morning it hadn't lost a drop of pressure.


I know it wasn't my skill putting it all together so it must have been the tape and dope.

FWIW, I taped first and then put the dope on the fittings (a plumber friend told me to do it that way)

Screenshot 2025-04-02 at 4.38.38 PM.png
Damned good feeling, innit?
 

Beerhippie

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I gritted my teeth and closed my eyes as I slowly opened that valve.....lol
I would be a little nervous about mixing iron and aluminum fittings. The aluminum is anodic compared to iron and can corrode badly with the addition of an electrolyte--like the condensate from a compressor--which is acidic enough to erode concrete.

Hope you're using a refrigerated air dryer....
 

SouthernIllinois

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I would be a little nervous about mixing iron and aluminum fittings. The aluminum is anodic compared to iron and can corrode badly with the addition of an electrolyte--like the condensate from a compressor--which is acidic enough to erode concrete.

Hope you're using a refrigerated air dryer....

The iron and aluminum didn't go together.

Hoses to the Transair fittings and the iron to iron.

Hope all you want - no refrigerated air dryer here.

Screenshot 2025-04-02 at 5.19.53 PM.png
 

SouthernIllinois

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@SouthernIllinois : Well done!

Sorry about the confusion--it sounded like you'd mixed the two.

By aluminum, did you mean the PEX-AL-PEX Maxline? How did you get it so straight?
Its a Transair product - 25mm rigid aluminum pipe with aluminum fittings, including the hose connections.

I was going to go with Rapidair Fastpipe but when I went to order the 20' sections of pipe, the shipping alone was over $700.

Come to find out a family owned local shop equipment dealer sells Transair stuff and would deliver everything for free.

I am stuck with a bunch of RapidAir Festive fittings I bought ahead of time that I can't giveaway, let alone sell.

I used a hydraulic hose from the compressor to the black pipe.

I used black pipe to get about 37' before the first filter (Motor Guard TP filter).

From the black pipe it ties into the Transair aluminum piping via a hydraulic hose.

I have three outlets spread around the shed, each with its own Motor Guard filter/regulator. I have about 120' of aluminum pipe in all.

Here are the best pics I have.

Screenshot 2025-04-02 at 5.38.06 PM.pngScreenshot 2025-04-02 at 5.39.10 PM.pngScreenshot 2025-04-02 at 5.39.48 PM.png
 

SouthernIllinois

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The blue stuff is Transair? Is it clad in something?

You garage makes my kitchen look filthy....

Beautiful Corvair(?)!

Yes, it's Transair pipe and fittings.

I think it's the same as RapidAir's Fast pipe - just a different brand but the fittings are not compatible.

Thanks - it's a 1965. As soon as the shop is done, it's getting blown apart, media blasted, epoxy primed and put on a rotisserie so I can start the bodywork. It's my first retirement project.
 

Beerhippie

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Yes, it's Transair pipe and fittings.

I think it's the same as RapidAir's Fast pipe - just a different brand but the fittings are not compatible.

Thanks - it's a 1965. As soon as the shop is done, it's getting blown apart, media blasted, epoxy primed and put on a rotisserie so I can start the bodywork. It's my first retirement project.
When I grow up, I'm gonna drive a Rampside Corvan....
 

no704

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How deep do you tap a npt female hole? Depends on what you are putting into it!
 
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