... coefficient of friction of all known solid material. Types and specifications TYPESDiameter(mm)Length(mm)pressed rod2~4produced under ... ,10,12,14,15,16,18,20,22,25,30,35,40,45,50,55,60,65,70,75 ... by paste extruding method in the diameter from 2 to 4mm and the other is made by ram extruding method ... bu moulding. · PTFE is the most chemical-resistant and the best dielectric of all known plastics.· It is ...