Applying Flomasta Liquid PTFE To Threads

  1. Pollys13

    Pollys13 Member

    Messages:
    333
    Location:
    Wiltshire UK
    Should I apply this all around, all the fitting threads that make contact with all the mating part, or just all around one or two? Into the valleys of threads? Got the replacement pipe onto the pot ok and rest of updated assemble. The paint finish held up under the Butane torch, bit hard going at first so gave a good dose of heat, once started, quite easy to get out.
    Cheers.
     
    • Pot Assembly.JPG
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  2. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,229
    Location:
    East Yorkshire
    To the mating surfaces. You shouldn’t be relying on threads to seal components.
     
  3. Pollys13

    Pollys13 Member

    Messages:
    333
    Location:
    Wiltshire UK
    I don't quite follow, how do you mean, in practice? Apply on the ridges of the threads, not the hollows?
     
  4. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,229
    Location:
    East Yorkshire
    Ok i see what it's for now. Yes, cover the threads. Might not seal, may need ptfe tape. Or hydraulic thread sealant would be better
     
  5. addjunkie

    addjunkie Member

    Messages:
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    Location:
    Northumberland. Reet oot in the sticks
    Looking at the last picture, is that a parallel or tapered thread. With a taper thread in particular it is the threads that seal
     
  6. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,229
    Location:
    East Yorkshire
    tape or thread would be better. Liquid PTFE doesn't like big gaps, as it doesn't fully cure. Positional Hydraulic sealant would be better
     
    mike os likes this.
  7. brightspark

    brightspark Member

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    27,684
    Location:
    yarm
    a bit of paste and ptfe tape good for sealing
     
  8. addjunkie

    addjunkie Member

    Messages:
    5,474
    Location:
    Northumberland. Reet oot in the sticks
    Im a loctite 577 fan. Swak etc is fine, but some you heed to allow time for setting before applying pressure.
     
  9. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,229
    Location:
    East Yorkshire
    This the grade I would use for that; 542
    image.jpg
     
  10. addjunkie

    addjunkie Member

    Messages:
    5,474
    Location:
    Northumberland. Reet oot in the sticks
    That would work, but its not resistant to certain chemical alchols etc, so it depends on the process fluids what you might choose.
     
    Shox Dr likes this.
  11. Pollys13

    Pollys13 Member

    Messages:
    333
    Location:
    Wiltshire UK
    The replacement pipe is BSPT.
     
  12. Pollys13

    Pollys13 Member

    Messages:
    333
    Location:
    Wiltshire UK
    Thanks everyone else for replies :)
     
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