PTFE (Polytetrafluoroethylene) is a high-performance plastic known for its excellent chemical resistance and thermal stability. It is available in two primary forms: extruded and molded. Each has distinct properties and applications, making it important to understand their differences.

What is Extruded PTFE?

  • Manufacturing Process: Extruded PTFE is produced by forcing PTFE resin through a mold or die under high pressure and temperature to form continuous shapes, such as rods, sheets, or tubing.
  • Material Properties: Extruded PTFE typically has a smooth, uniform surface and is highly flexible. It offers excellent resistance to chemicals, high temperatures, and electrical insulation properties.
  • Applications: Extruded PTFE is often used in applications requiring flexible materials, such as gaskets, seals, and tubing. It’s also used in wire insulation and conveyor belts.

What is Molded PTFE?

  • Manufacturing Process: Molded PTFE is produced by compressing PTFE powder in a mold and then heating it under pressure to form solid shapes. This process allows for more intricate and complex shapes compared to extrusion.
  • Material Properties: Molded PTFE tends to be denser and has a more uniform structure, which often provides higher strength and stiffness than extruded PTFE. It also has excellent chemical resistance and low friction properties.
  • Applications: Molded PTFE is typically used in applications requiring high structural integrity, such as bearings, valve seats, and electrical insulation components.

Key Differences Between Extruded and Molded PTFE

  • Shape and Size: Extruded PTFE is ideal for producing long, continuous shapes, while molded PTFE is better for complex or custom parts.
  • Density and Strength: Molded PTFE generally has higher density and strength, making it suitable for more demanding mechanical applications.
  • Flexibility: Extruded PTFE is more flexible, whereas molded PTFE tends to be stiffer and more durable in certain applications.