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How Long Does Delrin Last?

Discussion in 'Technical' started by pjgtech, Oct 2, 2019.

  1. pjgtech

    pjgtech If the Enemy is in range, so are You!

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    Just wondering? :shrug:
    I see lots of threads on delrin guides, bearings, washers, etc and just wondered how long they last before they wear out, become soft / brittle and/or need replacing?

    Is there an average life expectancy for the material?

    Or is it purely down to how much the gun is used, eg: if its a little used gun, they will last for years, or if its an often used gun, shooting 1000's of pellets in a relatively short space of time, then they will need replacing after a short while, eg: a year or so, etc?

    I assume that one of the reasons that material is used is because its long lasting.
    Genuinely interested to know.... thanx :thumb:
     
    Tyler durdon likes this.
  2. TORNADOS7

    TORNADOS7 Pro Poster

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    Hmmm, dunno really, would think a lot would depend on how much use the gun gets, from what I can make of it most break before they wear out though...
     
    Tyler durdon and pjgtech like this.
  3. ParzivaltheWalrus

    ParzivaltheWalrus Active Member

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    I don't speak from rifle experience but I use delrin hand pucks for longboarding, in which I use them to slide over tarmac. My current ones are lasting a long time, partly because they are so slippery but also because the material itself is very abrasion resistant (at least from my experience). Have a look here, it might help; https://www.dupont.com/content/dam/...ocuments/Delrin/Delrin Design Guide Mod 3.pdf
     
  4. pjgtech

    pjgtech If the Enemy is in range, so are You!

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    Cheers, interesting reading, thanx :thumb:
     
    Tyler durdon likes this.
  5. Rattymcrattyface

    Rattymcrattyface Nobody's honkin' Manilow

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    delrin 100 is stronger than delrin 500 it says. Hmmm


    Very Sharp Notch In order to examine the effect of notch radii substantially smaller than the 0.010 in radius specified for the Izod Impact test, special bars were molded, as shown in Figure 26, having a very sharp notch with a radius of 0.0005 in and a round notch cut to the same depth. Thus, the very sharp notch has a radius 20 times sharper than the standard Izod. The bar was impacted in the same manner as in the standard Izod test, being struck at the end nearest the notch. The data shows the tremendous effect sharp corners can have on the strength of a part and makes it even more clear why most failures are caused by the notch effect.
     
    Blackmax and ParzivaltheWalrus like this.
  6. El Caro

    El Caro Posting Addict

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    Genuine Delrin is a far superior product compared with the material bought and used for making guides etc and commonly called "acetal".
     
  7. Blackmax

    Blackmax Forum Rude Guy

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    Where do you get this from? Do you make it up as you go along?

    Yes Delrin is a different product to Acetal and both have their places in the world of airgun tuning but those who use Delrin such as @Tinbum and @shauny actually use that.
     
  8. El Caro

    El Caro Posting Addict

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    Get back in your box and dont be so sensitive. Have you something to hide? No way have I inferred that the two you mentioned use inferior materials.
    I was pointing out that there can often be confusion amongst those less knowledgeable than yourself between Delrin which is a trade mark of Dupont and the general term acetal which is a material often used in lieu:facepalm:
     
  9. welshwilly

    welshwilly Engaging Member

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    Delrin is actually Acetal. Polyoxymethylene (POM), also known as Homo-Polymer acetal. Delrin is a name used by Dupont and they charge a bit more for it.

    Other names it comes under
    Ticona Hostaform, Celcon ®
    Pom H
    BASF Ultraform®

    Same stuff different stamp on the tin

    WW
     
    Last edited: Oct 3, 2019
    ped, Tinbum, sharpsman and 9 others like this.
  10. TrickyDicky

    TrickyDicky Life in the slow lane

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  11. Spray1Mark

    Spray1Mark Very Active

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    DUPONT DELRIN does come in different grades, using the wrong grade of DELRIN (presuming you know the correct mechanical properites required for the application at hand) would in theory be no different I suppose to using non DUPONT branded Acetal and telling customers that you were using genuine branded DELRIN and still not knowing the grade required (does that make sense).

    Whilst EC doesn't appear to imply that anyone would be misleading their customers I can see why MAX is sensitive about the subject, often the end user presumes that just because a "brand" is used that they are getting something superior but have no idea why! I can only presume by the amount of unsolicited positive feedback the names mentioned get that their work is top quality and that is really all that matters isn't it?
     
    Last edited: Oct 3, 2019
  12. Spray1Mark

    Spray1Mark Very Active

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    I suspect the original question is impossible to answer!
     
  13. HW100Tuning

    HW100Tuning Straight Pride

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    Delrin is a brand name however the wikipedia does state that Dupont and others have a slightly different formula for there's. Finding genuine Dupont Delrin would be almost impossible without going to the factory, a bit like going to China and buying a pair of geniune Adidas trainers ;)

    https://en.m.wikipedia.org/wiki/Polyoxymethylene

    Acetal POM-C (commonly called Acetal) softer, better for seals
    Acetal POM-H (commonly called Delrin) harder, better for bearings, can be machined to tighter tolerances.

    However the properties are very close and for most airgun stuff it doesn't really matter.

    PS you don't infer, you imply. You take an inference, not give one. :up:
     
    ped and Nobby like this.
  14. HW100Tuning

    HW100Tuning Straight Pride

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    Real delrin is slightly harder, but finding some GENUINE delrin would prove a real problem.

    You can tell delrin when you machine it though... different to machine from POM-C
     
    RichieRich likes this.
  15. welshwilly

    welshwilly Engaging Member

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    To answer the original question I have been using Delrin / Acetal for a very very long time and it does last a very long time, I have had a few break and that was due to springs not being finished off correctly bad machining ( guided too tight / loose inside the spring ) cut too thin for the latch rod causing the guides to bend under pressure and fracture
    Delrin deadens the sound of the rifle when fired, it is also very slippy stuff as already mentioned, so you shouldn't have any spring buzz as you would with a steel guide.

    In all honesty I think Delrin / Acetal will last quite a few years without any real maintenance required.
    WW
     
  16. Spray1Mark

    Spray1Mark Very Active

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    Thanks for the inference and don't dare imply that I am wrong LOL!

    Getting DELRIN is very easy if your company uses tonnes of it to manufacture parts.
     
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  17. HW100Tuning

    HW100Tuning Straight Pride

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    Haha :up:

    Yeah i was talking about the general Joe off the street, most sellers says they have Delrin but sell you cheaper POM-C

    PS get me some.... pleaseeeeeee ;)
     
    Tyler durdon likes this.
  18. Spray1Mark

    Spray1Mark Very Active

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    Be careful what you infer-sorry imply there!
     
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  19. HW100Tuning

    HW100Tuning Straight Pride

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    Haha you won't forget that in a hurry though will you lolololol ;)
     
    Spray1Mark likes this.
  20. pjgtech

    pjgtech If the Enemy is in range, so are You!

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    Thank you sir, cheers. :thumb:
     

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