PTFE PTFE Compound


When the most critical operating conditions are present, the following features should be considered when using PTFE:

• its thermal expansion is 10% greater than that of metallic materials
• its abrasion resistance is low
• starting from a certain load level, it becomes permanently deformed due to cold flow
• its thermal and electrical conductivity are low

For these reasons even the excellent performances of PTFE cannot always fulfill the customers’ expectations, most of these properties can be selectively modified and improved by mixing PTFE with organic and/or inorganic fillers. Depending on the type and proportion of such fillers, it is possible to:

• increase the compressive strength, especially at high temperatures
• improve creep properties (lower cold flow)
• improve the wear resistance
• increase the thermal and electrical conductivity
• reduce the coefficient of thermal expansion improving the dimensional stability

By the way, the use of fillers will give the material a lower tensile strength and a poorer elongation at break. The type of filler can influence the chemical resistance and the coefficient of friction too. Thanks to its own compounding unit, Flontech has an extensive experience not only in the compound of PTFE with standard fillers such as glass fiber, carbon, graphite, bronze and molybdenum disulphide, but also in the development of new high performance filled PTFE grades thanks to special fillers such as ceramic, PEEK, PPS, PI, LCP, carbon fiber and nano materials.
MD: moulding direction      CD: cross direction

⁽¹⁾ Load 140 Kg/cm2for 24h at 23°C
⁽²⁾ Permanent deformation after 24h relaxation at 23°C
⁽³⁾ PV = 10 Kg.m/(cm2.min)
⁽⁴⁾ Roughness: 0.25-0.35 µ

Reference:
The mechanical properties have been evaluated from a 50x50 mm rod. moulded and sintered according to the following conditions:

preforming pressure	30 Mpa for all PTFE virgin grades and compounds with filler content ≤10%)
	50 Mpa for compounds with filler content >10%
syntering cycle	total time of 15 hrs, with 2 hrs and 40 min at max temperature of 370°C

All Flontech compound grades are available as -NFF (-1), Medium flow (-3), High flow (-6) and Very High flow (-10).
All Flontech compound grades are available both as virgin PTFE based and modified PTFE based polymer.
Specific composition grades are available upon request using propietory type of fillers/pigments and/or fillers/pigments combination.