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replacement rubber for trap machine throwing arms?

Discussion in 'Shooting Related Threads' started by skeet_man, Mar 10, 2009.

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  1. skeet_man

    skeet_man Well-Known Member

    Jan 29, 1998
    Rochester, NY
    Trying to help the club find a more economical solution to replacing the complete arms on our beomat skeet machines, which are pretty price at $50+ each, and have to be replaced on all 4 of our machines at least once a year.

    I was able to remove the rubber from one of the worn out arms (the metal is fine, its just the rubber thats shot).

    Has anyone sourced rubber that would be suitable for this? I've found something I think would work from McMaster, but thought i'd ask here 1st before i gambled.

    This is what i'm thinking:

    (Same as 86495K38)
    High-Strength Oil-Resistant Buna-N Rubber 5.0 mm Thick, 12" X 24", 60A Durometer
    In stock at $28.72 Each

    The other alternative I found was:

    (Same as 86495K38)
    High-Strength Oil-Resistant Buna-N Rubber 5.0 mm Thick, 12" X 24", 70A Durometer
    In stock at $28.72 Each

    Not quite sure what durometer to try 1st, and don't have any way of telling what it currently is.

    The factory rubber is translucent off-clear, and the rubber I found was black, but I doubt that matters much.

    If one of the 2 pieces I found would work, I would be able to rebuild 36 arms for $28.72 (or 79 cents/rebuild) vs $50+ for a whole new arm.
  2. Bob Hawkes

    Bob Hawkes Well-Known Member

    Jan 29, 1998
    Good luck Skeeter. Let us know how you make out. We also would be interested. Our Super Star trap traps have a hard plastic for lack of a better description. Our BeoMat skeet machines are like yours. We use both materials in the skeet machines depending on the time of year. Thanks, Bob
  3. Trussman2

    Trussman2 Active Member

    Feb 28, 2009
    Neither Buna-n or Nitrile are good choices as the ozone will ruin them in a few months. EPDM or silicone will hold up well, but I'm not sure how you would attach silicone, & it's quite expensive. I've had good luck with EPDM.


    O-ring Compound Descriptions

    Ethylene Propylene, EPDM:

    EPDM is a terpolymer combining ethylene, propylene and a diene monomer. EP materials offer a temperature range of -65F to +300F and offer excellent resistance to ozone, weathering, steam, water and phosphate ester type hydraulic fluids. EP can be manufactured to conform to FDA requirements, making it ideal for use with foods and medical devices.

    N70 / N90
    Nitrile, Buna-N:

    Nitrile, also known as Buna-N or NBR, is a copolymer of Butadiene and Acrylonitirle. It is the most commonly used elastomer for sealing products. Nitriles have a temperature range of -40F to +250F and are exceptionally resistant to petroleum base oils and hydrocarbon fuels. Nitrile materials also exhibit excellent tensile strength and abrasion resistance properties. Nitrile performs well with most dilute acids, silicone oils and lubricants. It is not recommended for use with ketones, aromatic hydrocarbons and phosphate ester hydraulic fluids.


    Silicone materials offer outstanding temperature resistance, from -80F to +400F. Silicone materials provide excellent resistance to sunlight, ozone, oxygen, UV light and moisture. It's inert qualities make it the preferred material for use with food handling and medical applications. Silicones offer poor tensile strength, tear and abrasion resistance, and are not recommend for use in dynamic applications.

    Fluorocarbon, VITON®:

    VITON® is the trade name for DuPont-Dow Elastomers Fluorocarbon or FKM material. VITON® has a temperature range of -20F to +400Fand provides excellent resistance to a wide variety of chemicals. While exhibiting exceptional resistance to chemical attack, VITON® has limited low temperature capabilities. In some applications intermittent exposure to +600F can be tolerated for brief periods of time.
  4. 320090T

    320090T Well-Known Member

    Jan 29, 1998
    Could it be the same stuff Pat Traps use?
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