Originally Posted by kellan
Why do you recommend buna orings on your power core compared to say viton, HNBR, urethane or a mix of all 3?
If you have the V1 can the oring fitment is a little looser. Black buna orings general have a good medium pressure fit.
Urethane orings will normally have a looser fit.
Viton orings are very hit and miss. Some fit very tight and some loose.
People are very confused on what o-rings can do for them.
Its not about the o-ring material at all. Sure some orings might last longer but fitment is much much more important.
Be concerned more about the fit. I have blue orings that are super expensive. But if they fit loose or tight then they are no use for the application I am trying to use them in.
I have hundreds of Urethane, Buna, Military spec, Hydrated (HNBR- green), silicon and grips of others.
Non of the above means anything to me if they don't fit correct.
People will tell you that a urethane will work better then a black. All bogus... Its the fitment and tension that is making it work better.....
This is all directed at dynamic orings. O-rings that slide on metal.
Static or non moving orings like outer can orings, frame sealing o-ring and orings that don't get friction I like to use black Buna orings as well.
Like above, they tend to run larger then urethane orings and seal great. Ruling out a leaking static o-ring is very important to me when I tech a luxe for a customer. So I do like a tighter fit on those. Urethane (clear) orings also work fine. I myself just have more black o-rings and they work just as good and are cheaper.
Sorry for the long ramble but I am sure some of the above info people will find useful.