Paper friction material although produced by paper making practises these materials are in fact elaborate composite structures which are made up of paper fibre, diatomite, carbon & friction powder. The materials porosity can reach highs of 70%. The production process consists of moulding the compound using heat & pressure, once the resin has solidified the material is blanked from sheet form & bonded to the steel core plate. Once this process is finished the final thicknesses & groove patterns are then machined to the surface. These are typically found in applications such as power shift transmissions & wheel brakes. The following are properties that are associated with this type of material:

  • Porous structure and flexibility
  • Low ratio of static to dynamic coefficient of friction
  • Smooth engagement
  • Excellent energy capability
  • Good wear resistance
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Parameter Wet Application Dry Application
Dynamic Coefficient (μd) 0.10 – 0.14 N/A
Static Coefficient (μs) >= 0.14 N/A
Wear Rate (λ) <= 2.0x10-8cm3/J N/A
Conditions of Application Specific Pressure: <= 9MPa Linear Velocity: <= 40m/s Oil Temperature: <= 200 ºC N/A