![]() ![]() If you have ever disassembled a ptfe joint you would know that the tape is smashed and stretched in the joint spaces until it does not resemble tape. There is a green ptfe tape made specifically for this. Standard Ptfe tspe should not be used on oxygen lines. There is also green for medical gasses (oil free tape) and gray / silver for use with stainless steel and aluminum pipe (has anti-seizing compounds embedded in the tape). This is also good for gasoline and propane lines. Again, most people are unaware of this change and hardware stores rarely sell it for the DIY market, but if you are going to get an inspection, this is what you must use now. Pink = triple density, required for NPT threads 1/2" to 2". In many jurisdictions you MUST use double density tape on gas piping, so inspectors will look for yellow. Yellow = double density, required for natural gas (methane) piping 1/2" to 2" dia. "Double Density" tape used to come in white as well, but because that could be used for larger pipes, it was impossible for inspectors to know if the white tape used on 1/2" and larger pipe was in fact double density, so they stopped making it. White = single density tape and is ONLY good for small fittings up to 3/8 in. The colors mean something, but the meaning has changed over the years so some info may be old. It doesn't seal as well as a good quality joint compound. So after all this talk about TFE tape, I wouldn't recommend it. He said that if all the contractors in the area used this product, his job would be a lot easier. He made a point to come over and thank me for using this product. They supply gas to thousands of homes in our area. It just happened that the local gas supplier tech showed and was checking on something. One day I was in the process of installing one of my gas pipe jobs. I would always use a pipe joint compound/paste type product, Rectorseal was my go-to choice. If I could add a side note after running several miles of gas pipe in my time, I never used TFE tape on my joints exclusively. The white is rated for something less than 10,000-Lbs. The red tape is for large diameter pipe, 2" and above. There evidently is a red type also, that is triple density. the yellow stuff is rated for 10,000 Lbs. *** After some minor research, evidently there are differences, however, as I see it, these differences are way beyond the scope of the common everyday amateur or even most professionals, i.e. It is rated for slightly lower temperature. One or two wraps would be equivalent to to six or eight of the white stuff. I know from handling it that it is clearly heavier. ![]()
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