Which o ring material is best for hydraulics?

   / Which o ring material is best for hydraulics? #1  

STx

Veteran Member
Joined
Oct 13, 2014
Messages
1,132
Location
Bandera, Tx
Tractor
New Holland TC40 DA, Deere 17D, Hyster SX50 forklift, Case D450, Kubota ZD1011-54, International Dump Truck, Kubota SVL-952S, Volovo EC250DL
I need to replace an o ring on my hydraulic system and have both rubber and viton (fluorocarbon) on hand. Which is better for this application? I'm leaning towards the viton this time. They're $$$$ but, I've already got them.
 
Last edited:
   / Which o ring material is best for hydraulics? #2  
I would think just the standard nitrile rubber ie buna-n.
 
   / Which o ring material is best for hydraulics? #3  
Buna bounces,viton does not:
Simple test, need metal rod about 12" or so, or something similar,brass,copper,etc. Put o-ring in question under one end of rod pin the other end down with your finger raise end over o-ring then let it drop if it bounces it's buna,if it hits with a dead thud it's viton.
 
   / Which o ring material is best for hydraulics? #4  
Buna bounces,viton does not:
Simple test, need metal rod about 12" or so, or something similar,brass,copper,etc. Put o-ring in question under one end of rod pin the other end down with your finger raise end over o-ring then let it drop if it bounces it's buna,if it hits with a dead thud it's viton.
Thanks for that, but not what he was asking.
 
   / Which o ring material is best for hydraulics?
  • Thread Starter
#5  
Thanks for that, but not what he was asking.
LOL, it's all good.

I ended up using the Viton, I've had the traditional rubber fail twice here so I figured I'd try something different. We'll see how it holds up over time.
 
   / Which o ring material is best for hydraulics? #6  
McMaster-Carr chart; the temp difference may cause the Viton to be slightly more robust, I would think.

j05-about-orings-rating-gis.png


j05-about-orings-gis.png
 
Last edited:
   / Which o ring material is best for hydraulics? #7  
What is the application? Viton will with stand higher temperatures and different fluids than nitrile or Buna - N. Seal failure is usually a result of their being to large of a gap between metal mating surfaces not the seal material itself.
 
   / Which o ring material is best for hydraulics? #8  
If you think Viton is expensive price out a compound like Kalrez. I would go Viton over rubber everytime when dealing with hydraulics. Rubber breaks down much quicker.
 

Tractor & Equipment Auctions

Onan 634T 6 Cylinder Genset (A49251)
Onan 634T 6...
Challenger 4-Post Car Lift (A49251)
Challenger 4-Post...
Kivel 48in Pallet Fork Attachment (A49251)
Kivel 48in Pallet...
New Holland BR750 Round Baler (A49251)
New Holland BR750...
2023 EXA INDUSTRIAL SAND CHASSIS (A48992)
2023 EXA...
2019 Ford Fusion Sedan (A46684)
2019 Ford Fusion...
 
Top