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Low Friction PTFE O-Rings

black PTFE o-rings

Polytetrafluoroethylene (PTFE for short) is a low-friction synthetic rubber that has long been used for sealant applications for a variety of substances including gases, fluids & chemicals.

PTFE O-Ring Temperature Range

Although PTFE has lower mechanical properties compared to other plastics, the material’s chemical resistance in tandem with its ability to withstand a wide temperature range (-100oF to +400oF) allow PTFE O-Rings to provide effective resistance to weathering as well as electrical and thermal insulation.

Because PTFE is such a dense material, it cannot be “melt-processed”.  It must be compressed and sintered to form useful shapes (like o-rings).

   Top Applications

   Mechanical Weaknesses

    • Outdoors
    • Lubricants
    • Hydrocarbons
    • Acids
    • Alkalis
    • Detergents
    • Alcohol
    • Ketones
    • Steam
    • Refrigerants

    • High Vacuum Seals
    • Low-Compression Vacuum Sealing Flanges
    • Super-Heated Steam

Enhance Mechanical Properties with Filled Grades

As shown in the table above, PTFE O-Rings have some mechanical vulnerabilities compared to other plastics. If needed, these properties can be enhanced by adding fillers, such as:

      • Glass Fibers
      • Carbon
      • Graphite
      • Molybdenum disulphide
      • Bronze

“Filled” O-Rings maintain their excellent chemical and temperature resistance while fillers improve mechanical strength, stability, and wear resistance.

Filler

Physical Form

Amount (% Weight)

Effect of Filler

Glass Fibers Milled Fibers Up to 40% (also in combination with graphite, MoS2, and carbon)
  • Increased Wear Resistance
  • Increased Compressive Strength
  • Reduced Cold Flow
  • Resistant to Organic Solvents
  • Increased Rigidity
Carbon Powder Up to 35% (also in combination with graphite, bronze, and glass)
  • Increased Compressive Strength
Carbon Fibers Milled Fibers Up to 30%
  • Increased Hardness
  • Increased Wear Resistance
  • Improved Thermal Conductivity
  • Good Dry-Running Properties
  • Electrically Conductive at Higher Filler Contents
  • Resistant to Hydrofluoric Acid
Graphite Powder Up to 25% (also in combination with glass, bronze, and carbon)
  • Improved Sliding Properties
  • Reduced Coefficient of Friction
  • Improved Thermal Conductivity
Bronze Powder Up to 60% (also in combination with carbon, graphite, and MoS2)
  • Increased Compressive Strength
  • Increased Hardness
  • Increased Wear Resistance
  • Improved Thermal Conductivity
  • Reduced Cold Flow
Molybdenum Disulfide (MoS2) Powder Up to 5% (also in combination with glass and bronze)
  • Improved Sliding Properties
  • Increased Wear Resistance
Stainless Steel Powder Up to 60%
  • Improved Thermal Conductivity
  • Reduced Cold Flow
  • Resistance to Most Chemicals
Polymers Powder Up to 20% (also in combination with inorganic fillers)
  • Increased Wear Resistance
  • Not Abrasive to Mating Surface
  • For Soft Mating Surfaces
Pigments Powder Up to 2%
  • For Coloring (Identification)