Polychlorotrifluoroethylene ( PCTFE ) - Supplier Data by Goodfellow

Background

Polychlorotrifluoroethylene PCTFE is also known as Kel-F or Neoflon.

It is an expensive, semi crystalline, melt processable thermoplastic. It has a chemical structure similar to that of PTFE but with one chlorine atom substituted for a fluorine atom in the repeat group.

Polychlorotrifluoroethylene PCTFE offers a unique combination of physical and mechanical properties, non-flammability, high optical transparency, chemical resistance, near zero moisture absorption and excellent electrical properties.

Polychlorotrifluoroethylene PCTFE also has extremely low outgassing (0.01% TML, 0.00% CVCM, 0.00% WVR when tested per ASTM E-595-90) and so is suitable for use in aerospace and flight applications.

Industrial Applications

Applications of Polychlorotrifluoroethylene PCTFE include chemical apparatus, process equipment, cryogenic applications, valve seats, seals, gaskets, sight glasses (special process), laboratory equipment, medical equipment, gears, cams and bearings.

Key Properties

The key properties of Polychlorotrifluoroethylene ( PCTFE ) are tabulated below.

Table 1. Key properties

Chemical Resistance
Acids - concentrated Good
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Good
Greases and Oils Good
Halogens Good
Ketones Good
Electrical Properties
Dielectric constant @ 1 MHz 2.24-2.8
Dielectric strength ( kV.mm-1 ) 14
Dissipation factor @ 1 MHz 0.01
Dissipation factor @ 1 kHz 0.023-0.027
Surface resistivity ( Ohm/sq ) 1015
Volume resistivity ( Ohm.cm ) 1016
Mechanical Properties
Compressive strength ( MPa ) 9-12
Elongation at break ( % ) 80-250
Hardness - Rockwell R75-112
D75-90 - Shore
Izod impact strength ( J.m-1 ) 267
Tensile modulus ( GPa ) 1.3-1.8
Tensile strength ( MPa ) 31-41
Physical Properties
Density ( g.cm-3 ) 2.10 - 2.14
Flammability V-0
Refractive index 1.435
Resistance to Ultra-violet Good
Water absorption ( % ) <0.01
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 70
Heat-deflection temperature - 0.45 MPa (°C ) 126
Lower working temperature (°C ) -240
Specific heat ( J.K-1.kg-1 ) 0.9
Thermal conductivity ( W.m-1.K-1 ) 0.13
Upper working temperature ( °C ) 120-149

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