Posted by Crazy Horse on November 29, 2020 at 15:28:36 from (108.173.201.233):
In Reply to: Re: Thread sealer posted by Farmer Rock on November 29, 2020 at 15:17:19:
FR .... this below is from a discussion forum on a web search .... sounds like the color is marker as to the product's thickness in some cases and it's actual chemical makeup in others. At least from what this says ....
"The colors mean something, but the meaning has changed over the years so some info may be old. The CURRENT standard is:
White = single density tape and is ONLY good for small fittings up to 3/8 in. pipe. Most people are unaware of this. "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.
Yellow = double density, required for natural gas (methane) piping 1/2" to 2" dia. pipe. In many jurisdictions you MUST use double density tape on gas piping, so inspectors will look for yellow.
Pink = triple density, required for NPT threads 1/2" to 2". 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. This is also good for gasoline and propane 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).
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