PTFE is available in virgin & filled compounds to improve the basic characteristics to match very diverse applications & optimisation for specific end uses.

Sr. No.
Grade
Filler Content
by Weight %
Properties
1 Virgin PTFE - • Excellent chemical resistance.
• Outstanding electrical properties.
• Excellent flexural properties.
2 Glass filled PTFE 15 - 25

• High compressive strength.
• Better wear resistance.
• Excellent chemical resistance.
3 Carbon / Coke filled PTFE 25 - 35 • High compressive strength.
• Better wear resistance.
• Better thermal conductivity.
4 Graphite filled PTFE 15

• High compressive strength.
• Good chemical resistance.
• Improved frictional properties.
5 Bronze filled PTFE 40 - 60

• High compressive strength.
• Excellent wear resistance.
• Very low cold flow.
• Good thermal conductivity.
6 Bronze plus, Molybdenum Disulphide filled PTFE 55 + 5

• Improved fictional properties.
• High compressive strength.
• Excellent wear resistance.
• Very low cold flow.
• Good thermal conductivity.
7 Aluminium Oxide filled PTFE 5 - 10

• Excellent electrical properties.
• Excellent wear resistance.
• Excellent  compressive strength.
8 Calcium Fluoride filled PTFE 5 - 10

• Excellent chemical resistance.
• Excellent wear resistance.
• Excellent  compressive strength.
• Good with chemicals that attack glass.
9 Stainless Steel filled PTFE 5 - 10

• Excellent chemical resistance.
• Outstanding mechanical properties.
10 Mica filled PTFE 5 - 10

• Excellent compressive strength.
• Very low coefficient of thermal expansion.
• Poor tensile properties.

Caution:

The presence of filler generally causes following negative features in compounds:

  • Reduction in tensile strength & break elongation.
  • Reduction in volume & surface resistivity.
  • Lower chemical resistance depending upon type of filler.
  • Reduction in coefficient of linear thermal expansion.
  • Difficulty in processing & fabrication.

 

  
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