StingrayL82 wrote:
Let me correct myself....the yellow propane thread tape DOES have Teflon in it, but the white tape that everyone knows as Teflon Tape (i.e.: the stuff that comes in a white or blue case) is what I was referring to, when I said don't use it.
The yellow tape is specially formulated for use on propane systems.
Thank you for the link. I looked at it and dug a bit deeper.
The issue with thread tape appears to be related to other plastics in the tape, rather than the Teflon (PTFE). So, it appears the yellow tape uses other plastics versus what's used in the white tape.
It also appears the primary purpose of PTFE in thread tape/compound/paste/sticks is thread lubrication.
Compatibility between PTFE and liquified propane (LPG) is rated A-Excellent. (PTFE compatibility with gasoline is rated B-Good.) I verified the compatibility across multiple sources.
I've never run into issues with white thread tape in propane connections. This may be due to the tape being a secondary part of my 'belt-and-suspenders' approach to propane connections. I am, however, switching to yellow thread tape in the few cases where I do use thread tape. (Will also be replacing existing white tape.)
The paste- and stick-type thread sealants, with PTFE/Teflon, that I commonly use are listed as compatible with gasoline. (Still trying to find a reliable source that specifically states compatible with propane/LPG.)
We've all run into this type of issue in our older motorhomes. (If you haven't yet, you probably will at some point in the future.) Some types of alcohol in common gas line antifreeze and 'gasohol' eat the older type of seals in carburetors and elsewhere. (I've mentioned before having to repeatedly rebuild the Carter BBD in my '77 Dodge B200 van due to excessive use of 'cheap' gas line antifreeze.)
