PTFE-Compounds

Compounds are mixtures of PTFE or other modified PTFEs and specific fillers. PTFE materials are normally “modified” with filler contents between 5 and 40%. The fillers are only embedded and do not undergo a binding reaction with the PTFE. The maximum filler content used is determined by particle size, particle form and the chemical composition.

Frequently used inorganic fillers are

  • Glass (fibers, hollow spheres, milled)
  • Carbon (coking coal, electrographite, conductive pigment, graphite, carbon fibers)
  • Bronze (spherical, irregular, dendritic, oxidizing, non-oxidizing)
  • Molybdenum disulfide (MoS2)
  • Steel powder, stainless steel
  • Ceramics (e.g. aluminum oxide)
  • Wollastonite / mica / minerals (e.g. BaSO4)
  • Pigments

Classification according to particle form

Particle form Example
Spherical metallic fillers Bronze as spherical or irregular particles in particle sizes of < 60 µm
Powder fillers Irregular carbon powder particles with diameters be-tween 5 and 150 µm, graphite in irregular platelet forms of < 60 µm or MoS2 powder in sizes between 0.1 and 40 µm
Fiber fillers Glass in different fiber lengths of 10 µm diameter, carbon fibers or other mineral fibers

Influence on material properties based on the percentage of filler material

Percentage of filler < 5%:

Hardly any influence on material properties, except: pigments

Percentage of filler > 40%:

No further improvement to material properties

Example:

PTFE + 60% bronze

PTFE density 2.16 g/cm³ / bronze density 8.73 g/cm³ = 27 % as volume percentage

PTFE + 20% PPSO22

PTFE density 2.16 g/cm³ / PPSO2 density 1.44 g/cm³ = 27 % as volume percentage

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