Why NBR Gaskets Are Ideal for Transformer Sealing

 

Introduction

Sealing in oil-filled transformers is critical to prevent oil leaks, moisture ingress, and insulation damage. Choosing the right gasket ensures safety, performance, and long service life.

What Is NBR (Nitrile Rubber)

NBR (nitrile-butadiene rubber) is a synthetic elastomer known for its oil, grease, and fuel resistance, good mechanical strength, and flexibility. Its acrylonitrile content affects oil resistance and low-temperature performance.

Key Advantages

  • Oil & Fuel Resistance: Prevents swelling and leaks.
  • Mechanical Strength: Tensile, tear, and abrasion resistant.
  • Temperature Range: Performs well from -40°C to +100°C (air) and up to ~120°C in oil.
  • Cost-Effective: High performance at lower cost.
  • Compression & Seal Integrity: Maintains a tight seal under load.

Limitations

  • Not suitable for prolonged high temperatures (>120°C).
  • Can become brittle below -40°C.
  • Sensitive to strong chemicals, ozone, and UV exposure.

Tips for Selection & Installation

  • Choose the correct grade, hardness, and thickness.
  • Ensure smooth flange surfaces and proper torque.
  • Consider NBR blends for extreme conditions.
  • Inspect and replace gaskets regularly.

Conclusion

NBR gaskets provide reliable sealing, durability, and cost-effectiveness for transformers. Pristine Tech offers high-quality NBR gaskets tailored to your specifications. Contact us for expert guidance and leak-proof solutions.

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