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3 Main Gasket Classifications

Image Source: Lionel Allorge

A gasket is used to prevent leaks from a mechanical joint, as well as to strengthen its weak point. The effectiveness of the gasket depends on its compatibility to the material. There are 3 main classifications of gasket: metallic, semi-metallic and non-metallic.

1. Metallic Gaskets

These gaskets are made from one metal or a combination of several metals. Metallic gaskets are suitable for work pieces that require high bolt loads and temperatures.

Corrugated metal gasket

This gasket is shaped into parallel grooves and ridges to increase its strength. It also has a high level of resistance.

Ring joints

Ring joints are commonly used for piping systems and vessels with required pressure of about 1,000 to 15,000 psi. These gaskets usually come in an oval or octagonal shape for more accurate dimension and for a better surface finish. (Source: whatispiping)

2. Semi-metallic Gaskets

These gaskets are made from a combination of metallic and non-metallic components. Semi-metallic gaskets are good for moderately high temperature applications.

Metal jacketed gasket

This gasket is composed of a metallic outer shell, with a metallic or non-metallic inner filler. A metal jacketed gasket is commonly used as a heat exchanger. It can transfer heat from one medium to another, since it connects or joins 2 pieces of mechanical equipment.

Camprofile gasket

This gasket is composed of a steel core with concentric grooves on the side. Camprofile gaskets are usually used in industrial power plants.

Spiral wound gasket

This gasket is composed of an inner ring made of special steel and a spiral wound, V-shaped metal strip. It can operate at a temperature of about -250ᵒC to 1,000 ᵒC.

3. Non-metallic Gaskets

These gaskets are manufactured with non-asbestos materials or compressed asbestos fibre (CAF). Non-metallic gaskets are used for low to medium pressure applications.

Rubber gasket

This gasket is used by many because of its toughness, resistance and flexibility. Rubber gaskets are available from Coruba. Please contact us for orders and enquiries.

Graphite gasket

Usually composed of either pure expanded granite or expanded granite with metal reinforcement, graphite gaskets are recommended for use in temperatures from -240ᵒC up to 550ᵒC. They are also pressure based on the reinforcement. (Source: Seal-mart O)

PTFE gasket

The polytetrafluoroethylene (PTFE) gasket is a very dense sealing material that adapts perfectly to the flange. It is generally used for materials with the presence of aggressive chemicals.

Gaskets come in different many different forms. Make sure you choose the perfect gasket to ensure the efficiency and effectiveness of the materials you are using.



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