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 Antifriction graphite-fluoroplastic materials


Graphite-fluoroplastic material of the grade 7B-2A
Is used to manufacture shells for thrust and radial slipping bearings of various hardware and tools operating in the stream of fluids (antifreeze, sea and fresh water, oil products, spirit, different aqueous solutions of chemical products, etc.).

Size of moulds, mm
  Diameter:  
  External   480   425   365   365   365   310   310   295   275   275
  Internal   395   330   310   270   190   245   210   230   210   175
  Hight   130   130   130   130   130   130   130   130   130   130

  Diameter:  
  External   240   230   200   190   160   160   150   110   85   62
  Internal   175   175   140   80   100   75   60   60   35   -
  Hight   130   130   130   130   130   130   130   130   130   130

Phisico-mechanical and thermal properties
  Density, kg/m3 (g/cm3), min.   1900 (1.90)
  Compressive strength, MPa (kgc/cm3), min.
  34.3 (350)
  Thermal coefficient of linear expansion in the interval
  of temperatures 293-473K (20-200° C), 10 1/K
  perpendicular to the pressing axis
  1.3-2.5

For the parts made of the material 7B-2A it is recommended to use steel, chrome dressing as the countershank material; permissible specific pressure is 10-15 kgc/cm2; permissible speed is 5 m/s. Permissible working temperature upon exploitation of products made of 7Б-2А material in the oxidizing medium comes to 180° C, in the reducing and neutral media is the same and comes to 250° C. Amount of wear at permissible specific pressures and speeds in the conditions of dry friction in the air at the indoor temperature for 100 hours of operation is not more than 30 mkm.
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