Jan 20 2004
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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