Nitrile (NBR；BF, BG, BK, CH)：
NBR is a copolymer of butadiene with acrylonitrile and was initially used to make products resistant against crude oil or petroleum. It exhibits better resistance against aromatic hydrocarbons when compared to neophytadiene, though performance is slightly below that of polysulfides. NBR has good resistance to mineral oils and vegetable oils. However, NBR has lower resistance against oxidizing agents such as acetone, butanone, and other ketones. NBR has good resistance against acids and bases, but not to those that are considered strong oxidants. The excellent heat aging performance of NBR is the main reason why it is considered a better material than natural rubber.
※ We welcome orders of O-rings of various dimensions or other customized specifications.
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Nitrile (NBR) O－Ring
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Base material or commercialized product
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Nitrile or Buna
N
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Chemical name
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Nitrile butadiene
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ASTM D1418 Nomenclature
--→
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NBR
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ASTM D2000 SAEJ200→
Type. class
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BF﹐BG﹐BK﹐CH
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Physical properties
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Density (gm/cm3)
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1.00
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Hardness range (shore A)
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20-90
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Breathability
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B–A
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Electrical resistance
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D–C
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Odor
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B
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Taste
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C–B
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Stain resistance
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C–B
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Stickiness
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B–A
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Mechanical properties
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Tensile strength (max psi)
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3﹐500
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Abrasion resistance
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A
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Flexural resistance
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B
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Tear resistance
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B
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Impact resistance
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C
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Deformability
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B
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Flexibility
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B
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Elastic resilience
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B
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Stress relief
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B
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Thermal properties
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Recommended maximum operating temperature (℃)
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100-125
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Low temperature ductility
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C
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Thermal aging resistance
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B
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Flame resistance
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D
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Resistance against the following elements
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Weathering
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C–B
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Oxygen
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B
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Ozone
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C–D
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EM radiation
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B
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Water
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A
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Steam
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C–B
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Bases (dil / conc)
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B/B
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Acids (dil / conc)
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B/B
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Oil, petroleum, kerosene
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A
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Benzene, liquid hydrocarbons
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B
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Animal and plant oils
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B
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Oxidizing solutions
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D
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Halogenated solvents
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C–B
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Alcohol
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C–B
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Synthetic lubricants
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B–A
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Hydraulic circulation:
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Silicate
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B
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Phosphate
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D
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※A = Best B = General C = Poor D = Not recommended
