The Benefits of Using a PTFE O-Ring


The PTFE O-Ring was developed after PTFE was discovered in 1938 by Dr. Roy Plunkett. PTFE, or Polytetrafluoroethylene, is a synthetic polymer consisting of carbon and fluorine. While it has many uses as a non-stick coating, it is also known to reduce friction and wear in machinery and mechanical assemblies.

The chemical composition of PTFE makes it an excellent material choice for O-Rings. PTFE is known to be hydrophobic, impervious to most chemicals and also maintain its integrity at both extremely low and high. O-Rings made with PTFE provide a superior seal with minimal break-in time and can be used in a variety of applications where elastomeric seals will fail.


O-Rings made of PTFE allow for a superior product that can withstand a variety of conditions, including high heat and chemical applications. While other O-Rings may deteriorate in extreme heat, PTFE O-Rings maintain their performance without melting or burning at temperatures as high as 500° F.

PTFE O-Rings can also repel all common fluids. Rubber and elastomer O-Rings typically break down when exposed to many chemicals, solvents, and oils. PTFE is affected only by some alkali metals and certain few fluorinated compounds.

PTFE O-Rings are also known for having an extremely low coefficient of friction—the resistance to motion between two touching surfaces. Excess friction can cause unnecessary wear on machinery and components. The lack of friction provided by PTFE O-Rings means that wear is uniform, making it possible to reduce the amount of lubrication or omit it altogether (based on the application).


A PTFE O-Ring is superior to those made of other materials because of its even surface, free from chips, threads, and other defects that can lead to leaks. This high-quality finish combined with extended durability make PTFE O-Rings the best choice for a number of applications.

There are certain dynamic applications that demand sealing properties that can only be provided by a PTFE O-Ring. Dynamic applications involve the movement of parts that require a seal. If your application involves corrosive chemicals, extreme temperatures, high purity, chemical inertness and requires a low friction coefficient, an elastomeric seal is a poor choice. PTFE O-rings are designed to handle these conditions, which are common in industries such as aerospace, chemical processing, gas exploration, and many more.

The PTFE O-ring is also appropriate for certain static applications, or applications where there is no movement of parts. In this case the seal is generally referred to as a gasket. Because of its resistance to corrosive media, it is often the perfect choice for chemical plants in need of flange seals. PTFE O-Rings are one of the most versatile options available for low-pressure, static applications because they are composed of inert materials.


Chicago Gasket Company makes the Mirror Finish™ PTFE O-Ring, which is the best choice for high heat and chemical applications. These O-Rings feature an ultra-smooth surface, free from imperfections that could cause leakage. Contact us today for more information about size, design, stretch, and load capabilities.

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