Reinforced PTFE

PTFE’s excellent chemical and high temperature characteristics are maintained in Reinforced PTFE, and it mechanical strength, stability, electrical and wear resistance properties can be enhanced by adding fillers such as glass fibers, carbon, graphite, molybdenum disulphide, and bronze.
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In order to improve the performance of PTFE material, typical fillers such as glass fibers, carbon, graphite, bronze and molybdenum disulphide is used to filled in PTFE material. This improves the material ability to wear and enhances its unique combination of chemical, mechanical strength, stability, electrical and wear resistance properties.

These filler can enhances the properties of PTFE, on the other hand, it increase the machining difficult, so to get a high tolerance and good surface finish, apart from a skilled experience and acknowledge of material, suitable tools and speed should be well control when machining reinforced PTFE parts.

Glass fiber

Glass Fiber is the most common filler for PTFE, the percentage varying between 5 and 40%. It gives good wear resistance, low creep, and good compressive strength, as well as excellent chemical compatibility. The major disadvantage is that glass-filled PTFE compounds are abrasive to mating surfaces.

  1. Increases compressive strength
  2. Rigidity and wear
  3. Reduces creep and cold flow
  4. Minimal effect on chemical and electrical properties

Carbon is filled to the PTFE in a percentage by weight between 10 and 35%, imparts excellent compression and wear resistance, good thermal conductivity, and low permeability. Improve to a considerable degree, wear and deformation strength, while leaving practically unchanged the chemical resistance, but substantially modifying the electrical properties.

  1. Increases compressive strength
  2. Hardness, wear and load properties
  3. Good chemical resistance

The percentages used vary between 5 and 15%. Graphite lowers the coefficient of friction and improve the temperature resistance in some way.

  1. Reduces coefficient of friction
  2. Reduces initial wear
  3. Increases strength
  4. Compatible with most hydraulic fluids
  5. Improve the temperature resistance

Bronze filled PTFE has the best wear properties, remarkable deformation strengths and good thermal conductivity, but poor electrical characteristics and chemical resistance.


Molybdenum disulfide (MoS2) improves wear resistance and further lowers the coefficient of friction.