P.T.F.E. is a soft thermoplastic with some excellent properties like chemical inertness and low coefficient of friction. In adding filler properties like hardness, resistance to wear and deformation the electrical and thermal conductivity can be changed. UPM’s compound division produces over a hundred types of compounds ranging from a few kilogram’s to a few tonnes annually.
The matrix material for these compounds is mainly purchased from well-established PTFE producers. Filler percentage can vary from 0,1% to 75%. The only limitation is that the filler must be able to withstand the prolonged sintering temperature of 380°C. Filler types are pigments of inorganic nature such as glass fibres, bronze, graphite, carbon, calcium fluoride in single form or combination.
Weergeven
This powder shaped compound is used for hand filling of moulds with considerable wall thickness. If we compare Free Flow or Extrusion grades with the same composition to the properties of a Non Free Flow than the NFF is better.
FF is used for hand filling or automatic moulding. The flow and bulk density are properties wherefore U.P.M. still develops new methods to improve.
Extrusion grade is not suitable for free sintering. It is only suitable for automatic moulding. Also Extrusion grades can be made in all different types of compositions.