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Ptfe Tape

Discussion in 'Technical' started by Phil Peacock, Jan 16, 2020.

  1. Phil Peacock

    Phil Peacock Member

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    Any comments on the wisdom or not of using this as a thread seal for 200bar compressed air on a pcp air rifle block, specifically in my case rapid 7 block on last few threads before O ring bottle holder into block and exhaust valve to block blanking plug.

    think I know the response but hey it would be useful to hear a few opinions as am sure this must have crossed a few minds in the past.

    Phil P 20200116_162320.jpg
     
    Last edited: Jan 16, 2020
    Redcap 114 likes this.
  2. Strathrpc

    Strathrpc Posting Addict

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    It should only be used on tapered threads.
     
    Radlad, John Entwistle and Lev Levvin like this.
  3. StellaArtois Sr

    StellaArtois Sr Springer Whore

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    I was going to put it on my air cylinders, and people suggested that I don't use it on them or anywhere near a rifle.
    Whether it degrades and bits can break up get lodge in gun parts I don't know for sure, but that it what I suspect is the
    reasoning behind it. The other thing is, if it was good to use I think the manufactures would use it.
    I am sure there will be a proper explanation coming this way very soon.
    Ade :thumb:
     
    Phil Peacock likes this.
  4. pjgtech

    pjgtech Keep Back...!! 2 Metres min...!!

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    My understanding is that fittings for high pressure air should not have any such tape used, as the fittings are designed to be used metal to metal as it were. Introducing tapes that are not designed for HPA is probably not a good idea.
     
    StellaArtois Sr likes this.
  5. Boysey

    Boysey Busy Member

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    It’s an absolute “No, No”.

    Do not use PTFE on any gun threads. It’s not the thread that retains the seal...... it’s the “O ring” that makes the seal.

    You have been warned in the nicest possible way!


    .
     
    2506sendero and BallisticBill like this.
  6. Sutty

    Sutty Engaging Member

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    Ok for tapered threads as stated. Parallel threads should have other sealing mechanisms eg o-rings.
     
    Radlad likes this.
  7. Widow

    Widow Engaging Member

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    Ptfe

    Plumbers Tape Fixes Everthing.
     
    TORNADOS7, foxtrott and 2506sendero like this.
  8. Boysey

    Boysey Busy Member

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    Sorry, but I think your talking about plumbing. No guns that I know of have tapered threads.

    I reiterate.... it’s the O-Ring that makes the seal.

    PTFE IS OF NO USE AT ALL!!


    .
     
    BallisticBill likes this.
  9. Sutty

    Sutty Engaging Member

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    Some fittings for filling whips, compressor accessories etc might use taper threads especially if for American market.
     
  10. Widow

    Widow Engaging Member

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    I was bieng silly... But it does fix most things... I've used it to stop a cut bleeding, and hold up my trousers when my belt snapped

    Don't use it on air rifles though!
     
    Gat Man, TR158 and Boysey like this.
  11. Boysey

    Boysey Busy Member

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    Agree, some whip fittings yes. (But not all)

    I was trying to deter anybody from ruining their rifle/ pistol as the original post was suggesting as this looked like a gun part to me!

    But what do I know, I’ve only been repairing guns for the past 50 years!

    Apologies if you’ve taking offence.


    .
     
  12. Phil Peacock

    Phil Peacock Member

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    Peter, As I suspected, I have taken what you say on board and on reflection it was an ill considered question , thankyou for your response.
    Phil P
     
    Boysey likes this.
  13. Brooksy

    Brooksy Posting Addict

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    PTFE tape will bunch up and impinge on the O ring, this will deform the O ring and it won't do its job. An O ring works best if it's left to float, therefore filling any gaps.
     
  14. squib

    squib Posting Addict

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    Under no circumstances use PTFE high pressure air.
    Masking tape is much better :thumb:
     
    Lev Levvin and 2506sendero like this.
  15. Boysey

    Boysey Busy Member

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    Thank you for your response.

    As I’ve said previously, it really is a “No, No”.

    Trying to recover from a PTFE Taped thread seal is Bloody nightmare as it gets into parts of the action that causes a real headache.

    PCP Guns of course but I’ve had springers that have had seals done with this stuff!


    .
     
  16. Sutty

    Sutty Engaging Member

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    Not in the slightest - we're all on the same team!
     
    Gat Man and Boysey like this.
  17. Phil Peacock

    Phil Peacock Member

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    That's me told in no uncertain terms :thumb:
    It really is appreciated .
     
  18. Boysey

    Boysey Busy Member

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    Never told in uncertain terms

    It’s to protect the members of this fabulous forum from utter disaster! and not to mention a probable very expensive repair bill.

    Happy shooting!


    .
     
    Phil Peacock and Sutty like this.
  19. Strathrpc

    Strathrpc Posting Addict

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    On a side note. It should also never be used on hydraulic systems!
     
    BallisticBill likes this.
  20. Boysey

    Boysey Busy Member

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    Probably for similar reasons.

    PTFE gets into bits you really didn’t want it to ! (under high pressure)


    .
     

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