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Old 12-15-2012, 02:17 PM #1
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Buna vs urethane?

When I went to o-ring monkey to buy o-rings for my nxt I was suprise to see they offer no polyurethane o-rings. Has everyone one switched to straight buna?
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Old 12-15-2012, 02:33 PM #2
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I got both metric sae nitrile and hnbr at harbor freight in $2.99 kits. Have many but not all the sizes. I use online o rings for my stuff now. They shop fast and take Paypal.
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Old 12-15-2012, 07:01 PM #3
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Quote:
Originally Posted by shooter22 View Post
When I went to o-ring monkey to buy o-rings for my nxt I was suprise to see they offer no polyurethane o-rings. Has everyone one switched to straight buna?
90 durometer urethane o-rings are going to be more durable for bumpers, SFT o-ring, etc. They cost about 5 times as much though, so people often leave them out of marker o-ring kits. I still use them on my guns/customers guns.

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I got both metric sae nitrile and hnbr at harbor freight in $2.99 kits. Have many but not all the sizes. I use online o rings for my stuff now. They shop fast and take Paypal.
The harbor freight o-rings are ok for plumbing and some other non dynamic seals, I would never use them on my paintball gear. All sorts of goofy seams, off-round and inaccurate sizing.

They do come from harbor freight afterall.
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Old 12-15-2012, 07:10 PM #4
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I hate how people always knock china freight
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Old 12-15-2012, 10:59 PM #5
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I hate how people always knock china freight
It's fine. When I needed a 1 x 3mm for a manifold a couple weeks ago worked in a pinch. Besides since when was rubber indigenous to the United States?
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Old 12-16-2012, 12:34 PM #6
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i usually use 90 durometer buna for sft orings and bumpers with no problems.
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Old 12-26-2012, 06:31 PM #7
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i actually prefer the green hbnr o-rings. they are a little more costly than buna but last longer and seem to wear better and they are not nearly as expensive as urethane. i say go with urethane for dynamic seals if you can afford it but if not i prefer the hbnr. i try to only use buna o-rings for non-dynamic except for the sft o-ring.
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Old 12-26-2012, 07:12 PM #8
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i actually prefer the green hbnr o-rings. they are a little more costly than buna but last longer and seem to wear better and they are not nearly as expensive as urethane. i say go with urethane for dynamic seals if you can afford it but if not i prefer the hbnr. i try to only use buna o-rings for non-dynamic except for the sft o-ring.
Do you mean that hnbr o-rings wear better to conform to the surroundings and thus provide less friction or that they don't wear as much and would take more break-in time?
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Old 12-26-2012, 11:02 PM #9
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I asked Oring monkey for some 90s in green and they sold them, just ask them if you want anything not listed.
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Old 12-27-2012, 05:16 PM #10
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Do you mean that hnbr o-rings wear better to conform to the surroundings and thus provide less friction or that they don't wear as much and would take more break-in time?
been my experience they last longer. if you don't put on very good fitting o-rings then it will take a longer break-in time no matter what type you use.
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Old 12-29-2012, 12:57 AM #11
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Do you mean that hnbr o-rings wear better to conform to the surroundings and thus provide less friction or that they don't wear as much and would take more break-in time?
Perhaps you'll find this useful: http://www.zdspb.com/tech/misc/resources/orings.html
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Old 12-29-2012, 01:51 AM #12
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To my knowledge, HBNR o-rings are more resistant to high temperatures and petroleum products than standard NBR, which is why they are often used in automotive applications. Shouldn't make much difference for paintball.
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Old 01-08-2013, 06:15 PM #13
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How do you guys store your O-rings?
Just a ziplock bag or parts box? Do you do anything to protect them from air? do they need to be protected from air?
Just thinking I should buy a few hundred and put them on a coat hanger in actual size order. Ex: have a hanger of 012's in order of size so I can mark where worked last time and just go one over next time.
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Old 01-08-2013, 06:19 PM #14
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I have mine in the orignal ziploc bags from oringmonkey. I don't think buna reacts with anything in the air.
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Old 01-08-2013, 08:00 PM #15
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I have a small 2 sided fly tackle box for mine. And some oddball sizes in ziplock bags.
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