Carbon Seal Ring

Carbon Seal Ring

A carbon seal ring, also known as a carbon face seal or mechanical carbon seal, is a type of sealing component used in various rotating machinery to prevent leakage of fluids or gases between the rotating and stationary parts. It is commonly utilized in pumps, compressors, mixers, and other industrial equipment where a high-performance, durable, and efficient sealing solution is required.

Description and Composition:

Carbon seal rings are typically made from a combination of carbon materials, such as carbon fibers and graphite particles, along with a binder or resin to hold the structure together. The specific composition can vary based on the application and the desired properties of the seal ring.

Working Principle:

Working Principle: The carbon seal ring functions as a dynamic sealing element between the rotating shaft and the stationary housing or casing of the machine. It consists of two parts: a stationary ring, which is mounted in the housing, and a rotating ring, which is attached to the shaft.

When the machine operates, the rotating ring makes contact with the stationary ring, creating a tight interface between the two surfaces. This interface forms a barrier that prevents the fluid or gas from leaking across the seal. The sealing action is achieved through a combination of factors, including the precision of the seal face flatness, the pressure exerted on the seal faces, and the self-lubricating properties of the carbon material.


Carbon seal rings are used in a wide range of applications, including:

  • Centrifugal Pumps: These pumps use carbon seal rings to prevent the leakage of pumped fluid along the shaft.
  • Compressors: In various types of compressors, such as centrifugal compressors or screw compressors, carbon seal rings provide efficient sealing to avoid gas leaks.
  • Mixers and Agitators: Carbon seal rings are used in the shaft sealing of industrial mixers and agitators to prevent product leakage.
  • Gas and Steam Turbines: Carbon seals are employed in gas and steam turbines to maintain the integrity of the internal systems and prevent gas leakage.

Advantages of Carbon Seal Rings:

  • Excellent Sealing Performance: Carbon seal rings offer a reliable and effective sealing solution, preventing leaks and ensuring the proper functioning of the machinery.
  • Self-Lubricating: The carbon material has inherent lubricating properties, reducing the need for external lubrication and enhancing the wear resistance of the seal.
  • High-Temperature Tolerance: Carbon seal rings can withstand high operating temperatures, making them suitable for applications involving hot fluids or gases.
  • Low Friction: The low coefficient of friction of carbon materials ensures minimal wear on the seal faces during operation.


Carbon seal rings can be sensitive to certain chemicals and abrasive substances, potentially limiting their use in some applications. Improper installation or misalignment of the rings can lead to premature wear and reduced sealing performance.

Key Markets:

  •  Aerospace
  • Automotive
  • Chemical
  • Food
  • Industrial
  • Medical
  • Mining
  • Oil & Gas
  • Pharmaceutical


General Properties of Carbon & Graphite Products (Average Values)
Impregnation Density g/Cm4 Apparent Pororsity % Hardness On Shore Compressive Strength flexural/Transverse Strength Heat Resistance Coefficient of Heat Expansion C.E.T A S H
“D” Scale N / mm2 N / mm2 C C    
resin 1.70g/cm3 1.5 80 180mpa 60mpa 200 6.5
resin 1.70g/cm3 2 70 182mpa 62mpa 200 4 0.1


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