What is a Flange Gasket?

Flange 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.

Types of Gaskets

Materials for gaskets can be divided into three main categories:

  • NON-METALLIC TYPES
  • SEMI-METALLIC TYPES
  • METALLIC TYPES



Spiral Wound Gaskets dimensions


Flanges DIN EN 1092-1

RTJ type R gasket dimensions and tolerances


Class 150-2500 - NPS 1/2-36

Non-Metallic Gaskets dimensions - B16.47 Series A


Class 150-600 - NPS 26-60

Non-Metallic Gaskets dimensions - B16.47 Series B


Class 150-600 - NPS 26-60

Spiral Wound Gaskets dimensions - B16.47 Series A


Class 150 - NPS 26-60

Class 300 - NPS 26-60

Class 400 - NPS 26-60

Class 600 - NPS 26-60

Class 900 - NPS 26-60

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