Metal
Cased
PTFE
Seals

Independence Seal offers two standard profiles for Metal Cased PTFE rotary shaft seals.  Our advantage over major OEMs such as Parker, Trelleborg, TriTec in addition to price are FASTER production, no minimum quantity and no tooling charges.

Single PTFE Lip Metal Cased

• Carbon or Stainless Steel Case
• Viton Element with Standard Virgin PTFE Lip
• Suitable for medium to high speed application
• Suitable for low to medium pressure
• Abrasive-Resistant and pressure-stable, for use in fans, pumps, compressors, gear-boxes, and engine crank case.
• Low friction can be achieved via hydrodynamic effect on the sealing lip.

• Speed: ≤ 30m/s
• Pressure: ≤ 8 bar
• Temperature: -150°C ~ 225°C

Dual PTFE Lip Metal Cased Seals

• In addition to the primary sealing lip this profile has a dust lip, or excluder lip to provide an extra layer of protection against both contaminants and corrosion.

• Carbon or Stainless Steel Case
• Viton Element with Standard Virgin PTFE Lip
• Suitable for medium to high speed application
• Suitable for low to medium pressure

• Speed: ≤ 30m/s
• Pressure: ≤ 8 bar
• Temperature: -150°C ~ 225°C

PTFE (polytetrafluoroethylene) rotary shaft seals are specialized seals designed to prevent the leakage of fluids along rotating shafts in various industrial applications. Here’s a breakdown of key points about PTFE rotary shaft seals:

1. Material: PTFE is the primary material used for these seals due to its excellent chemical resistance, low friction coefficient, and high temperature resistance. PTFE is commonly known by the brand name Teflon®.  In addition to virgin PTFE other lip material is available: Carbon PTFE, Bronze Filled PTFE, and Graphite Filled PTFE.
2. Design: PTFE rotary shaft seals typically consist of a PTFE sealing element bonded to a metal or plastic case. The PTFE element is shaped to create a lip that seals against the rotating shaft. The seal prevents the leakage of fluids (such as oil or grease) from the machinery.  There are numerous other designs available depending on your application.
3. Performance: These seals offer several advantages:
   • Chemical Resistance: PTFE is inert to most chemicals, making these seals suitable for a wide range of applications.
   • Temperature Resistance: PTFE can withstand high temperatures without losing its sealing properties.
   • Low Friction: The low friction coefficient of PTFE reduces wear on the sealing surface and helps maintain efficiency in rotating applications.
4. Applications: PTFE rotary shaft seals find use in industries such as automotive, aerospace, manufacturing, and food processing. They are used in gearboxes, pumps, mixers, and other rotating equipment where fluid leakage needs to be controlled.
5. Installation: Proper installation is crucial for the effectiveness of PTFE rotary shaft seals. The shaft surface should be smooth and free of nicks or scratches that could damage the seal. The seal housing must be correctly sized and installed to ensure a tight fit.
6. Maintenance: While PTFE seals are durable, they can wear over time, especially in demanding conditions. Regular inspection and replacement of worn seals are important to maintain equipment efficiency and prevent leaks.
7. Customization: PTFE rotary shaft seals can be customized based on specific application requirements, including size, shape, and material compatibility.

In summary, PTFE rotary shaft seals are critical components in machinery and equipment, providing reliable fluid containment and protection against leakage in rotating shaft applications across various industries. Their unique properties make them ideal for challenging environments where chemical resistance, temperature stability, and low friction are essential.