PTFE O-rings

PTFE O-rings (Polytetrafluoroethylene O-rings) are a type of sealing ring made from PTFE, a synthetic fluoropolymer of tetrafluoroethylene.

PTFE is commonly known by the brand name Teflon, though Teflon is a registered trademark of Chemours.

These O-rings are widely used in various industries due to their unique properties.

Key properties

Chemical Resistance:

  • PTFE is highly resistant to a wide range of chemicals, including acids, bases, solvents, and hydrocarbons.

  • This makes PTFE O-rings ideal for use in chemically aggressive environments.

Temperature Resistance:

  • PTFE can withstand extreme temperatures, typically ranging from -200°C to +260°C (-328°F to 500°F).

  • This property is particularly valuable in applications involving cryogenics or high heat.

Low Friction:

  • PTFE has an exceptionally low coefficient of friction, allowing for smooth operation and reduced wear.

  • This is advantageous in dynamic sealing applications where the O-ring is in motion.

Non-stick Surface:

  • The non-stick nature of PTFE prevents the accumulation of debris or materials on its surface, reducing contamination risks.

Non-reactive and Non-toxic:

  • PTFE is non-reactive, making it suitable for use in applications like food processing, pharmaceuticals, and medical devices.

Electrical Insulation:

  • PTFE is an excellent insulator, which can be beneficial in electrical or electronic applications.

Applications of PTFE O-Rings

Chemical Processing: Due to their exceptional chemical resistance, PTFE O-rings are commonly used in chemical reactors, pumps, and valves.

Pharmaceuticals and Food Industry: PTFE’s inert and non-toxic properties make it safe for use in equipment that processes food or drugs.

Aerospace and Cryogenics: PTFE's ability to perform in extreme temperatures makes it suitable for aerospace applications and cryogenic systems.

Semiconductor Industry: PTFE O-rings are used in equipment where high purity and chemical resistance are required.

Oil and Gas: These O-rings are often used in seals for pipelines and drilling equipment due to their durability in harsh conditions.

Advantages

Long service life due to wear resistance.

Excellent dimensional stability under varying pressures and temperatures.

Usable in both static and dynamic applications.


Disadvantages

PTFE is relatively stiff, which may result in less effective sealing under low pressure.

It can deform under heavy loads (creep) over time.

It is not as abrasion-resistant as some other materials like rubber.

Maintenance & Installation tips

Handle PTFE O-rings carefully to avoid scratching or damaging the surface.

Ensure the sealing surface is clean and free of debris to maintain proper sealing performance.

Use appropriate tools to prevent deformation or stretching during installation.

If you're selecting PTFE O-rings for a specific application, it's important to consider the chemical environment, temperature range, and pressure conditions to ensure optimal performance.

Contact us today for any technical assistance you may need - we are just a phone call away.

Contact us.

sales@sealxpress.co.uk
0121 544 4440

SealXpress Ltd, Unit 6, Elm Court, Crystal Drive,
Sandwell Business Park, West Midlands, B66 1RB