Types of Gaskets

Types of Gasket by Wah Joo Seng

What is a Gasket?

Gasket is a mechanical seal which its primary function is to seal the irregularities or space between 2 or more in-contact surfaces to prevent leaks and spills from or into the surfaces while being compressed.

Gaskets come in many different shapes and forms. Fortunately, there are many ways to classify them into different categories. Below are the 3 categories that we use to classify gaskets:

Material Function Design
Rubber Gasket Sealing Gasket Full Faced
Cork Gasket Anti-Vibration Gasket Inner Bolt Circle
PTFE Gasket Mounting Gasket Segmented
Silicone Gasket Spiral Wound Gasket
Metal Gasket Kammprofile Gasket
Viton Gasket Fishbone Gasket
  Sheet Gasket
  Double-jacketed Gasket
  Constant-Seating Gasket

These classifications are important factors to consider when it comes to choosing the right gasket.

*Disclaimer: our method of classification might differ from other people. We recommend you use classification method that best suits you.

Gasket by Material

Gasket properties are inherited from the materials they are manufactured from. Below are the common types of gaskets based on its materials:

  1. Rubber Gaskets (Nitrile, EPDM, natural rubber)

Rubber is a tough elastic polymer made from natural or synthetic resources. It comes in different properties and applications based on its monomer. Below are some of the common rubber types used for gasket:

1.1. Nitrile Rubber

Nitrile Rubber is very popular in petroleum, automotive and other related industry for its fuel/oil resistance. Nitrile does not swell when reacted with oil.

1.2. EPDM Rubber

EPDM rubber is one of the toughest rubbers that suits outdoor environment because of its UV and environmental resistant. EPDM Rubber also has good resistance to nitrogen, potassium and sodium.

1.3. Natural Rubber

Natural rubber as gasket material
Natural rubber

Natural rubber has an outstanding physical property and is suitable for bulk material handling.

  1. Silicone Gaskets

Silicone (polysiloxanes) is a popular gasket in food and pharmaceutical industry due to its bacterial inhibition property. It can be supplied in different shapes and forms and has excellent heat resistance property.

  1. Cork Gasket
Gasket material cork

Cork has excellent flexibility and compressibility and is usually combined with elastomer bindings to enhance its properties. In addition, combining cork with rubber material, such as silicone or neoprene will result in good oil, solvent and fuel resistance.

  1. PTFE Gasket
Gasket Material PTFE
PTFE Gasket

PTFE (Poly Tetra Fluoro Ethena) is a high-performance polymer with excellent chemical resistance, non-stick, hydrophobic properties that make it applicable for wide range of industries. One special PTFE gasket that we are supplying is Task-Line® gasket. Check out why Task-Line® gasket is different here.

  1. Viton Gasket
Gasket Material Viton
Viton Gasket

Similar to PTFE gasket, Viton gasket is also suitable for a wide range of aggressive and corrosive chemical, making it a hard contestant to PTFE.  While viton gasket is a more economical choice than PTFE, their chemical resistance properties are not as exhaustive as PTFE.

  1. Solid Material/Metal Gasket
Gasket Material Metal
Metal Gasket

Solid material gasket utilizes solid material such as metal that seals tightly. It can withstand higher pressure and temperature.

Other materials that can be used as gasket are fiberglass, paper & non-asbestos.

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Gasket by Function

Gaskets can be categorized by their functions. Below are some common types of gaskets based on its functions:

  1. Sealing Gasket

1.1 Liquid Seal

This gasket should be able to seal and prevent liquid spill. Gasket and fluid compatibility check is important to properly seal the connection.

1.2 Environmental Seal

Gasket as environmental seals will guard against dust and other contaminants. Generally, this seal is used in enclosures such as electrical enclosure to protect control equipment from contamination.

  1. Anti-vibration Gasket

As an Anti-vibration, this gasket is made to reduce sound frequency and vibration energy for moving equipment.

  1. Mounting Gasket

Mounting gasket is made to protect sensitive display units from shock, ingress of dust or other particles that may include liquids.

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Gaskets by Design

Gasket comes in many different designs. Below are some common types of gaskets based on its designs:

  1. Full Faced Gasket
Gasket that covers the entire flange
Full-Faced Gasket

Full-face gasket is a gasket that covers the entire flange.

  1. Inner Bolt Circle Gasket
Gasket that cover the inner circle
Inner Bolt Circle Gasket

Inner Bolt Circle gasket is a ring type gasket that sits within the circle of the bolts.

  1. Segmented Gasket

Segmented gasket covers gasket with unusual shape and sizes. It is formed by joining 2 or more gaskets so that if it is compressed it will provide a continuous seal.

  1. Spiral Wound Gasket
Strip Wound Gasket
Spiral Wound Gasket

Spiral wound gasket is a metal strip gasket that is sandwiched between layer of non-metallic filler. Spiral Wound gasket has alternative spiral layers of thin metal sheet and filler material.

  1. Sheet Gasket
Gasket made by sheet of material
Sheet Gasket

Sheet gasket is made by shaping a sheet of material into the shape of the gasket. Sheet gasket is cheap and easy to make.

  1. Constant Seating Stress Gasket

Constant seating stress gasket is made from 2 components: a solid carrier ring and two sealing elements. The sealing elements are made from materials that are suitable to the process fluid and application.

  1. Double-Jacketed Gasket
Double Jacketed Gasket
Double Jacketed Gasket

Double-Jacketed gasket is formed by bending a sheet of metal into a “C” form and fills its inner part with filler material.

  1. Kammprofile Gasket
Kammprofile Gasket
Kammprofile Gasket

Kammprofile is a gasket with solid corrugated core and a flexible covering layer. Kammprofile has an expensive capital cost but has a long lifespan and high compression rate especially on its ridges.

  1. Fishbone Gasket
Fishbone Gasket
Fishbone Gasket

Fishbone gasket is a replacement for Kammprofile and Spiralwound gasket with a better design. It does not unwind in storage or in the plant and does not damage the flange.

Thank you so much for reading till the end. If you have any enquiries for us, please contact kingflex@wahjooseng.com or call (65) 6298 3211. If you are enquiring for something else, visit our main website here.

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Author: Wah Joo Seng International Trading

Singapore Premium Hose and Coupling Distributor. Trusted since 1974. Delivering the best quality hose and coupling to you. Ready stock, assembly and delivery. http://www.wahjooseng.com

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