Understanding the Differences Between EPDM, Teflon, and Viton Tri Clover Seals

Understanding the Differences Between EPDM, Teflon, and Viton Tri Clover Seals

In the world of industrial sealing, selecting the right material is crucial for ensuring optimal performance and longevity of your equipment. Tri Clover seals, commonly used in sanitary and hygienic applications such as food and beverage, pharmaceuticals, and biotechnology, come in various materials, each with unique properties. This blog will delve into the differences between three popular materials: EPDM, Teflon, and Viton.

  1. EPDM (Ethylene Propylene Diene Monomer)


  • Temperature Resistance: EPDM seals can withstand temperatures ranging from -50°C to 150°C (-58°F to 302°F), making them suitable for a wide range of applications.
  • Chemical Resistance: They exhibit excellent resistance to water, steam, and a wide array of chemicals including acids and alkalis. However, they are not suitable for use with hydrocarbons, oils, or solvents.
  • Durability: EPDM is highly durable and can resist the effects of weathering, ozone, and UV exposure.
  • Flexibility: The material remains flexible at low temperatures, ensuring a tight seal even in cold environments.

Applications: EPDM Tri Clover seals are ideal for applications involving water, steam, and dilute acids. They are commonly used in the food and beverage industry due to their excellent resistance to cleaning chemicals and hot water.

  1. Teflon (Polytetrafluoroethylene - PTFE)


  • Temperature Resistance: Teflon seals have an impressive temperature range from -200°C to 260°C (-328°F to 500°F), making them suitable for extreme temperature applications.
  • Chemical Resistance: They offer unparalleled chemical resistance and are unaffected by almost all chemicals, making them suitable for the most aggressive environments.
  • Non-Stick Surface: Teflon's non-stick properties ensure that substances do not adhere to the seal, reducing the risk of contamination and making them easy to clean.
  • Hardness: Teflon is a relatively hard material, which can limit its ability to create a tight seal compared to more elastic materials.

Applications: Teflon Tri Clover seals are perfect for applications requiring high chemical resistance and high-temperature stability. They are often used in the chemical processing industry and in applications where contamination must be minimized.

  1. Viton (Fluorocarbon Rubber - FKM)


  • Temperature Resistance: Viton seals can operate within a temperature range of -20°C to 200°C (-4°F to 392°F), making them suitable for high-temperature applications.
  • Chemical Resistance: They offer excellent resistance to a wide variety of chemicals, including oils, fuels, and solvents. However, they are less resistant to acids and bases compared to Teflon.
  • Durability: Viton is known for its superior resistance to heat, oxidation, and ozone, ensuring long-term durability.
  • Elasticity: Viton provides a good balance of elasticity and hardness, ensuring a reliable seal in various applications.

Applications: Viton Tri Clover seals are widely used in applications involving oils, fuels, and solvents. They are commonly found in the automotive, aerospace, and petroleum industries due to their excellent resistance to hydrocarbons and high temperatures.


Selecting the right Tri Clover seal material depends on the specific requirements of your application. EPDM is ideal for water and steam applications, Teflon excels in extreme temperatures and aggressive chemical environments, and Viton is the best choice for high-temperature applications involving oils and solvents. By understanding the unique properties and applications of each material, you can make an informed decision to ensure the longevity and efficiency of your equipment.

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