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 Antifriction graphite-fluoroplastic materials


Graphite-fluoroplastic material of the grade -80
Is used to manufacture piston and thickening rings of compressors condensing moist gases (the dew point is above 0 C, moisture content is more than 4 g/m3 ).

Size of cylindrical moulds, mm
 Diameter:  
 External  655  485  445  420  395  375  335  325  285  230  175  140  130  115  115  100  70
 Internal  560  415  325  325  265  305  260  265  215  150  100  50  50  70  50  34  22
 Hight  100  100  100  100  100  100  100  100  100  100  100  100  100  100  100  100  100

Phisico-mechanical and thermal properties
  Density, kg/m3 (g/cm3), min.   2000 (2.00)
  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.   15.0
  Perpendicular to the pressing axis   6.0-12.0

For the parts made of the material -80BC it is recommended to use cast iron, steel and chrome dressing as the countershank material; permissible pressure is 10-15 kgc/cm2; permissible speed is 5 m/s. Permissible working temperature upon exploitation of products made of -80BC material in the oxidizing medium comes to 180 C, in the reducing and neutral media is the same and comes to 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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