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 -65^oF to +300^oF,on o-rings, although no one formulation may exhibit the total range.

Media Compatibility 

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

Non-Compatible

Phosphate esters
Ketones
Brake fluids
Strong acids
Ozone or weathering 

Nitrile® o-ring sizes:

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.