PTFE (POLYTETRAFLUOROETHYLENE)

PTFE (POLYTETRAFLUOROETHYLENE)

Material Information

PTFE is an abbreviation for PolyTetraFluoroEthylene. This material belongs to the fluorocarbon family. It is known to be the most chemically resistant plastic available and has the lowest coefficient of friction of all solid plastic material. PTFE’s mechanical properties are relatively low but they are useful over a wide range of temperatures (-100º F to 400º F). Other properties that this dense material displays are its excellent machinability, resistance to weathering, a low coefficient of friction, excellent electrical and thermal insulation, and “slipperiness”. It is also inert and non-toxic. It is very difficult to adhere anything to PTFE. PTFE is a “soft” material, which may pose problems for high load applications. PTFE is available in a white color in the form of rod, sheet, tube, and strip. It is FDA, USDA, and NSF compliant.

Application

  • Solid pipe and fittings
  • Liners
  • Gaskets and spacers
  • Valve components
  • Expansion bellows
  • Tubing
  • Seals
  • Piston rings
  • Bushings
  • Bearings
  • Wire and cable insulation
  • Fiber optics coating

Properties

  • Excellent electrical and thermal insulator
  • Outstanding chemical resistance
  • Wide range of operating temperature
  • Low mechanical properties
  • Weathering resistant
  • Low coefficient of friction
  • Slippery
  • FDA, USDA, and NSF compliant

Physical

Astm Test Method

PTFE

Density (lb/in^3) D792 0.078
Specific Gravity D792 2.16
Water Absorption @ 24 hours (%) D570  -

Mechanical

Tensile Strength (PSI) D638 3,900
Tensile Modulus (PSI) D638 -
Tensile Elongation at Break (%) D638 300
Flexural Strength (PSI) D790 No Break
Flexural Modulus (PSI) D790 72,000
Izod Impact (Notched), ft-lb/in D256 3.5
Shore D Hardness D785 D50

Thermal

Melting Point, °F D3418 635
Continous Service Temp (Operating), °F  - 500
Flammability Rating UL94 VO

Electrical

Arc Resistance (sec) D495  -
Volume Resistivity (ohm-cm) @ 50% RH D257 >10^18
Dielectric Constant at 1 MHZ D150 2.1
Dissipation Factor at 1 MHZ D150  -

NOTE:

The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.