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Kel-F ® PCTFE
(PolyChloroTriFluoroEthylene)
Specifications

TECHNICAL DESCRIPTION

PolyChloroTriFluoroEthylene is a fluorocarbon-based polymer and is commonly abbreviated PCTFE. The Kel-F ® brand is a registered trademark of 3M, but they discontinued production in 1995. The only remaining brand, Neoflon ®, is made by Daikin Industries of Japan. This PCTFE resin has the same chemical structure and properties as the original Kel-F ® brand material.

GENERAL PROPERTIES
PCTFE offers the unique combination of physical and mechanical properties, nonflammability, chemical resistance, near zero moisture absorption, and excellent electrical properties. These characteristics cannot be found in any other thermoplastic fluoropolymer with a useful temperature range of -400°F to +400°F (-240°C to +204°C).

PCTFE also has extremely low outgassing (0.01% TML, 0.00% CVCM, 0.00% WVR when tested per ASTM E-595-90), so it is suitable for use in aerospace and flight applications.
APPLICATIONS
  • Cryogenic applications -- super-cold refrigeration components
  • Valves -- seats, stems, seals
  • Seals -- lips, o-rings, v-rings, special construction seals
  • Compressors & pumps
  • Films -- food packaging, pharmaceutical packaging, optical recording, electroluminescent display panels
  • Gaskets -- pressure, diaphragm, liquid gauge seals, fluid handling
  • Bearings -- sleeve & thrust
  • Stock shapes -- for machining components

TYPICAL PROPERTIES of PCTFE
ASTM or UL test Property PCTFE
PHYSICAL
D792 Density (lb/in³)
(g/cm³)		 0.077
2.13
D570 Water Absorption, 24 hrs (%) < 0.01
MECHANICAL
D638 Tensile Strength (psi) 5,300
D638 Tensile Modulus (psi) 207,000
D638 Tensile Elongation at Break (%) 150
D790 Flexural Strength (psi) 8,500
D790 Flexural Modulus (psi) 180,000
D695 Compressive Strength (psi) 5,500
D695 Compressive Modulus (psi) 180,000
D785 Hardness, Shore D D90
D256 IZOD Notched Impact (ft-lb/in) 5
THERMAL
D696 Coefficient of Linear Thermal Expansion
(x 10 -5 in./in./°F)		 7.0
D648 Heat Deflection Temp (°F / °C)
at 264 psi
258 / 126
D3418 Melting Temp (°F / °C) 415 / 212
- Max Operating Temp (°F / °C) 270 / 132
C177 Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10 -4 cal/cm-sec-°C)
1.45
4.99
UL94 Flammability Rating V-0
ELECTRICAL
D149 Dielectric Strength (V/mil) short time, 1/8" thick 500
D150 Dielectric Constant at 1 MHz -
D150 Dissipation Factor at 1 MHz -
D257 Volume Resistivity (ohm-cm)at 50% RH 10 18

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.

KEL-F is a registered trademark of 3M Company.
NEOFLON is a registered trademark of Daikin Industries.