Overview of Oil-Resistant NBR Rubber (Nitrile Butadiene Rubber)

1. What Is NBR Rubber?

NBR (Nitrile Butadiene Rubber) is a synthetic rubber created through the copolymerization of acrylonitrile and butadiene. It is renowned for its excellent resistance to oil, solvents, and various chemicals, making it widely used in industrial applications.

OIL-RESISTANT RUBBER TIGER-JAPAN

2. Chemical Composition

• Acrylonitrile (ACN): Enhances oil and solvent resistance. ACN content typically ranges from 18% to 50%:

  • High ACN content → Better oil resistance but reduced elasticity.

  • Low ACN content → Better elasticity but lower oil resistance.

• Butadiene: Provides elasticity, abrasion resistance, and flexibility.

3. Characteristics of NBR Rubber

• Excellent resistance to oils and solvents, especially mineral oils, engine oils, and fuels.

• Good abrasion, tear resistance, and mechanical strength.

• Temperature resistance from −40°C to around 120°C (depending on formulation).

• Good water resistance but not durable in ozone, UV, and harsh weather environments.

• Properties can be adjusted by varying ACN content or adding specific additives.

4. Applications of NBR Rubber

• Automotive Industry:

  • Gaskets, seals, fuel and oil hoses.

  • Sealing components for hydraulic oil systems.

• Oil and Gas Industry:

  • Oil-resistant rubber hoses, gaskets in oil pumps.

• Glove Manufacturing:

  • Protective gloves, chemical-resistant medical gloves.

• Machinery Components:

  • Oil-resistant seals, gaskets, fuel hoses.

• Consumer Products:

  • Rubber pads, oil-resistant footwear.

5. Limitations of NBR Rubber

• Poor resistance to sunlight, UV rays, and ozone.

• Not resistant to strong acids or aggressive solvents like ketones and esters.

• Can harden and become brittle when exposed to excessive heat for prolonged periods.

6. Comparison Between NBR and Other Rubber Types

7. NBR Variants

• XNBR (Carboxylated NBR): Offers enhanced abrasion resistance and mechanical strength.

• HNBR (Hydrogenated NBR): Improved resistance to heat, ozone, and chemicals.

8. Summary

NBR rubber is an ideal material for applications requiring oil, solvent, abrasion, and moderate temperature resistance. However, it should be protected from sunlight, ozone, and strong chemicals to maintain long service life.

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