PTFE Joint sealant

Buna-N O-Rings

Buna O-rings are the most common o-rings on the market. Ideal for water or hydrocarbons (Oil & Gas), they are a staple in the industry.

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Buna-N (Nitrile) O-Rings

Nitrile butadiene rubber (NBR) is a family of unsaturated copolymers of 2-propenenitrile and various butadiene monomers (1,2-butadiene and 1,3-butadiene).The additives used to accomplish this are NOT always compatible with Buna-N and has resulted in the auto industry upgrading o-rings to Viton® elastomers.

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Nitrile® (Buna-N) O-Ring

 

Nitrile® (NBR or Buna N) (Acrylonitrile-Butadiene Copolymers)

Trade Names:
   Chemigum.................................Goodyear
   Hycar................................Zeon Chemical
   Krynac..........................................Polysar
   Ny Syn....................................Copolymer
   Paracril........................................Uniroyal
   Perbunan.......................................Mobay

Compounds of these polymers are the backbone of the O-Ring line.   Polymers vary from 18% to 50% acrylonitrile content.  Resistance to petroleum products increases as acrylonitrile increases; conversely, low temperature flexibility decreases.  Government specifications on o-rings require low acrylonitrile.

Nitrile® o-ring Compounds can exhibit excellent compression set, tear and abrasion resistance.  Unless especially compounded, they do not have good resistance to ozone, sunlight, or weather.  They should not be stored near motors or other ozone generating electrical equipment.  They should be kept from direct sunlight.   Compounds from nitrile rubber can exhibit a temperature range of -65oF to +300oF,on o-rings, although no one formulation may exhibit the total range.


O-Rings

 

Media Compatibility 

Petroleum Fluids
Water (to 212oF)
Silicone Fluids
Ethylene Glycol
General purpose

Non-Compatible

Phosphate esters
Ketones
Brake fluids
Strong acids
Ozone or weathering 

Nitrile® o-ring sizes:

-001 to -024 -025 to -049 -050 to -125 -126 to -150
-151 to -175 -176 to -222 -223 to -247 -248 to -272
-273 to -321 -322 to -346 -347 to -371 -372 to -395
-400 to -424 -425 to -449 -450 to -474 -475 to -932

To determine the o-ring size you require go to the following link: http://www.usseal.com/Oringdim.htm

 

If the size you need is not listed, please call us at (714) 593-9780.   

 

Buna-N O-Rings Properties

Good Wear Resistance, Good Compression Set Resistance, Good Short-Term Resilience, Good Permeation Resistance.

*Can be ordered in higher durometers for high pressure applications to prevent extrusion or ordered in lower durometers for fast sealing in lower pressure applications.

Temperature Range

-35º F to 250EF

Buna-N O-Rings : Recomended For

Silicone Greases / Oils, Water, Petroleum Oils / Fuels, Ethylene Glycol Fluids

Our Other Products


  • ASP Type 1

  • ASP Type 2

  • Type 60

  • Type MB

  • Carbon Yarn

  • Viton Ring

  • O-Ring

  • Pump Sealant

  • Injection Gun

  • PTFE O-Rings
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