To use for what purpose, may I ask? So called "teflon" tape is heavily misused in aquarium applications, which makes it hard to recommend anything without knowing what the original poster is planning to do with it. CO2 fittings? Water-related plumbing?Anyone have a brand or type they prefer or recommend?
Ahh throw in the other part..
http://www2.dupont.com/Teflon_Industrial/en_US/history_plumber_tape.html• 1969 — DuPont PTFE fine powder is used for plumber tape for sealing joints in piping and central heating systems. However, DuPont never manufactured the tape. The manufacturers purchased and used DuPont PTFE fine powder as consumers started favouring easy to apply PTFE tape over existing solutions. Plumber tape using DuPont™ Teflon® PTFE fine powder was the first such product to reach consumers.
• Times changed, other companies started making PTFE fine powder that was of a lower quality and at a lower cost. The companies that made the plumber tape switched to the lower quality powder. They didn’t have permission from DuPont to use the Teflon® brand because they no longer were using DuPont product.
• Separately, in the 1990’s, DuPont stopped selling its PTFE product lines labeled as Teflon®, including fine powder. The reason for the change was to ensure products bearing the Teflon® brand met the highest quality standards expected by consumers. Any use of the Teflon® brand now needs written authorization from DuPont.
Teflon® is a registered trademark of DuPont.
http://en.wikipedia.org/wiki/Thread_seal_tapeWhite – used on NPT threads up to 3/8 inch
Yellow – used on NPT threads 1/2 inch to 2 inch, often labeled "gas tape"
Pink – used on NPT threads 1/2 inch to 2 inch
Green – oil-free PTFE used on oxygen lines and some specific medical gasses
Copper – contains copper granules and is certified as a thread lubricant but not a sealer
http://www.terrylove.com/forums/showthread.php?20242-Which-pipe-dopeI dislike tape, so I use Oatey alone when I need to seal threads. When I was a kid on the farm, all we knew about was the bottom sediment of an oil based paint can. I guess it worked. Of course it undoubtedly had lead in it. Now we have so many choices we can color code our work. All of that while using 98% less threaded joints. How times change!
+1.Use any brand you can get your hands on.
Note, as the Wiki article correctly states, the purpose of thread seal tape is to provide lubrication for the mating threads. The lubrication is needed in order to make sure that the threads don't seize while being tightened, until they deform and mate properly. It is not the tape that seals the threads, it is the threads themselves that seal by deforming. The tape is there for lubrication only. And that lubrication makes sense for metal threads only. Plastic threads (like PVC) don't seize prematurely and therefore don't need any lubrication in order to reach the proper deformation point and produce a watertight seal.
I too was taught not to use tape on pvc. As soon as I started using it the leaking stopped.Note, as the Wiki article correctly states, the purpose of thread seal tape is to provide lubrication for the mating threads. The lubrication is needed in order to make sure that the threads don't seize while being tightened, until they deform and mate properly. It is not the tape that seals the threads, it is the threads themselves that seal by deforming. The tape is there for lubrication only. And that lubrication makes sense for metal threads only. Plastic threads (like PVC) don't seize prematurely and therefore don't need any lubrication in order to reach the proper deformation point and produce a watertight seal.
Too many people are trying to use this tape as some sort of "thread filler" that is supposed to "seal" the gaps between the threads. This is completely incorrect use of "teflon tape". If you are not sure of your thread-tightening skills (or just need extra assurance), use pipe dope or some other compound specifically designed to serve as a sealant. Meanwhile, "teflon tape" is not a sealant and has never been intended to be used as such.
Actually in this case it is more like Natural gas..or propane ect.. a real "gas"...Gas means gasoline, my friend.