Fluoropolymers / Alfa Chemistry

PTFE Compounds


PTFE compounds are based on the dry blend of fine-cut granular PTFE powder and a series of fillers, which can be used to produce products for low friction applications. On the premise of retaining the unique characteristics of PTFE, adding different fillers to PTFE will have varying degrees of impact on the wear resistance, creep resistance, thermal conductivity and electrical conductivity of PTFE.

The effects of commonly used fillers on compounds are summarized as follows

TypeEffects of FillerUse restrictionApplication
Filled with glass fiber
  • Higher pressure and wear resistance and better thermal conductivity
  • Good chemical resistance
  • Good electrical insulation
Resistant to organic solvents, not resistant to alkaline solutions and acidsValve seats, seals, bearings, requested to resist sliding and chemicals. Suitable for bearings working at low pH values.
Filled with carbon fiber
  • Very low deformation under load
  • Good abrasion resistance, even in a water environment
  • Better thermal conductivity and lower thermal expansion than glass fiber
  • Good chemical resistance
Carbon fiber is chemically inertPlain bearings, sealing rings, moving parts operating under conditions of limited lubrication or without lubricants.
Filled with graphite
  • Good lubrication effect
  • Low coefficient of friction
  • No static electricity
  • Good thermal conductivity
  • Good chemical resistance
When used with hard metals, it has high wear resistance and is easy to oxidizeBearings for high speed on fairly hard surface.
Filled with molybdenum disulfide (MoS2)
  • Good sliding and wear resistance
  • Combined with copper powder can achieve good oil-free dry operation
Not resistant to corrosion when used with hot concentrated sulfuric acidSeals and bearings with high elasticity and lowest friction coefficient. Guide bands. Details needing good resistivity.
Filled with bronze
  • Reduce deformation under load
  • Good thermal conductivity
  • Good conductivity
  • Poor chemical resistance
May be corroded by acid and waterUnlubricated bearings for high speed on moderately hard surface.
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