Teflon™  PTFE 641XT X is a polytetrafluoroethylene fine  powder resin used primarily for paste extrusion. Teflon™  PTFE  641XT X offers the excellent combination of properties  typical of Teflon™  fluoroplastic resins:  

• Non-aging characteristics 

• Chemical inertness to nearly all industrial chemicals and  solvents 

• Exceptional dielectric properties, stable with frequency  and temperature 

• Toughness and flexibility 

• Low coefficient of friction 

• Non-stick characteristics 

• Negligible moisture absorption 

• Excellent weather resistance 

• Service temperature up to 260 °C (500 °F)

• Useful properties at –240 °C (–400 °F) 

Teflon™  PTFE 641XT X is designed for high-speed processing  over a wide extrusion reduction ratio range (250:1–5000:1),  with excellent performance even at the top of this range. The  key feature of Teflon™  PTFE 641XT X is the enlarged operating  window over high extrusion reduction ratios, allowing a more  robust extrusion process. This can translate in increased  extrusion line speed and/or longer flawless wire length. Due to  its outstanding transformation characteristics, Teflon™  PTFE  641XT X can be extruded with very low lubricant levels over  a wide reduction ratio range, while the extrusion pressure  remains low. For example, Teflon™  PTFE 641XT X can be  extruded into wire with excellent performance in the reduction  ratio range of 1000:1–5000:1 with a single lubricant level of  16% (based on total weight). This means that a single PTFE/ lubricant mixture can be used for many constructions being  manufactured in the same size extruder line. 

In addition, the excellent high reduction ratio performance  means that products made in small-bore machines with other  lower reduction ratio-rated fine powders can now be extruded  in larger ones, representing a considerable economic advantage, as more material can be extruded per extrusion. This  also means that longer lengths of wire or tubing can be achieved  in one extrusion. 

Teflon™  PTFE 641XT X meets the requirements of ASTM D4895, Type I, Grade 1, Class C. 

Typical Applications  

Teflon™  PTFE 641XT X is mainly used for insulation of highperformance wire and cables, as well as tubing.