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 Antifriction graphite-fluoroplastic materials


Graphite-fluoroplastic material of the grade
Is used to mahufacture piston and gasket thickenings of compressors condensing dried gases (the dew point is below 0 C, moisture content is less than 4 g/m3 ).

Size of moulds, mm
  Diameter:  
  External   480   425   365   310   310   295   275   245
  Internal   395   330   312   245   210   230   210   205
  Hight   100   100   100   100   100   100   100   100

  Diameter:  
  External   230   200   160   160   110   95   85   62
  Internal   175   140   100   75   60   35   36  
  Hight   100   100   100   100   100   100   100   100

Phisico-mechanical and thermal properties
  Density, kg/m3 (g/cm3), min.   2100 (2,10)
  Nominal yield compressive stress, MPa (kgc/cm3), min.
  10,8 (110)
  Thermal coefficient of linear expansion in the interval of temperatures 293-473K (20-200 C), 10 1/K
 
  Parallel with the pressing axis, max.   12,0
  Perpendicular to the pressing axis   3,0-7,0

For the parts made of the material it is recommended to use cast iron, steel as the countershank material; permissible pressure is 15-20 kgc/cm2; permissible speed is 5 m/s. Permissible working temperature upon exploitation of products made of material in the oxidizing medium comes to 180 C, in the reducing and neutral media - 200 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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