Petroleum Resistant O-Rings

ASTM D1418 Designation: NBR, XNBR

ASTM D2000/SAE J200 Type, Class: BF, BG, BK, CH

Standard Color: Black

Description: Presently the seal industry’s most widely used elastomer, Nitrile combines excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols, with a good balance of such desirable working properties as low compression set, high tensile strength, and high abrasion resistance.

Key Use(s): Oil resistant applications of all types. Low temperature military uses. Off-road equipment. Automotive, marine, aircraft fuel systems. Can be compounded for FDA applications.

Temperature Range: Standard Compound: -40⁰ to +250⁰F. (Dry Heat Only)

Hardness (Shore A): 40 to 90.

Features: Comprised of the copolymer butadiene and acrylonitrile, by varying the relative proportions of these two base monomers, depending upon the compound, Nitrile performance characteristics may also be varied over a working temperature range of -65⁰F to +300⁰F.

Increasing acrylonitrile content gives Nitrile its better resistance to petroleum-based oils and hydrocarbon fuels, enhancing resistance to the degrading effects of heat, at a cost of reduced low temperature performance.

Conversely, decreasing acrylonitrile, while increasing butadiene content, provides better low temperature flexibility, a characteristic most often required by Air Force-Navy (AN) and Military Standard (MS) O-ring specifications.

Limitations: Precautions should be taken to avoid exposure of Nitrile to such highly polar solvents as Acetone, MEK, Chlorinated Hydrocarbons and Nitro Hydrocarbons, which are known to cause rapid and extreme deterioration.

Additional limitations on Nitrile use include applications with direct exposure to ozone and sunlight. Suggested precautions for storage include keeping petroleum resistant o-rings out of direct sunlight, as well as away from ozone-generating electrical equipment.

Stigall offers this material in several compounds and grades.  

Grades available:

Commercial, Transformer, Cloth Inserted, and Specification to MIL Specs.

Please consult with your Stigall Sale Representative for more information. 

Stocked Products:

B-260-125-48

B-260-250-48

B-270-125-48

B-270-187-48

B-270-250-48

Many other products and combinations are available