What are gaskets


Gaskets are used to create a static seal between two flanges faces, at various operating conditions, with varied pressure and temperature ratings. A gaskets fills the microscopic spaces and irregularities of the flange faces, and then it forms a seal that is designed to keep liquids and gases. Correct installation of damage-free gaskets and demage-free flange faces is a requirement for a leak-free flange connection.
If it would be technically possible, in order to manufacture flanges perfectly flat and smooth, and perfectly compatible with one another under all operating conditions, a gasket would not be necessary. But in normal practice it is not possible, because flange connections under ANY circumstances should be made. Small impurities and a small bit of dirt, is in practice not be avoided and therefore it is necessary to use a gasket.

Materials used:
Flange gaskets are made of various materials like:

  • Rubber
    • Neoprene
    • EPDM
    • Nitrile
    • EVA
    • Silicone
    • Cork and Cork Rubber
  • Closed Cell Foam
    • Cross-linked Polyethylene
    • PVC
  • Plant Fiber
  • Cellulose Fiber
  • Metal
    • Steel
    • Stainless Steel
    • Aluminum
    • Copper
    • Cast iron etc.

Buying Tips

  • Material selection: Selection of the proper gasket material is important with regard to the flange finish and performance.
  • Flange gasket types: Flat face or ring type
  • Thickness selection
  • Correct size
  • Durability

gaskets2 - What are gaskets

Types of flange gaskets:
Standard pipe flange gasket line includes two basic styles:
  • Ring Type and
  • Full Face

Both ring type and full face pipe flange gaskets are available in both low and high pressure options.

How to measure pipe flange gaskets?
It is necessary to know the nominal pipe size and the gasket’s inner diameter and outside diameter.

Applications of Typical Flange Gaskets:

  • HVAC (Heating, Ventilation, and Air Conditioning) Industry: Usually, flange gaskets used in this industry are made of different types of rubber. They are usually supplied with adhesive on one or both sides in various shapes like round (I.D. x O.D.), rectangular and square outside shapes. Flange Gaskets are available for wide flange configurations.
  • Plumbing Industry: Here, the standard ring and full face flange gaskets are available in various styles.
  • Sheet Metal Enclosures: The flange gaskets used here are normally rectangular in shape. They come with adhesive on one side which is used as a gasket to seal out dust, liquids or air.
  • Electronic, food, medical, chemical and packaging industries: The flange gaskets used here have a flat surface that is compressed between two flanges.

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