Jan 20 2004
Tetrafluoroethylene-Perfluoro (alkoxy Vinyl Ether), Copolymer PFA, also known as Teflon PFA has properties similar to polytetrafluoroethylene (PTFE). It differs from the PTFE resins in that it is melt-processable using conventional injection molding and screw extrusion techniques.
Key Properties
The key properties of Teflon PFA are tabulated below.
Table 1. Key properties
| Chemical Resistance |
| Acids - concentrated |
Excellent |
| Acids - dilute |
Excellent |
| Alcohols |
Excellent |
| Alkalis |
Excellent |
| Aromatic hydrocarbons |
Excellent |
| Greases and Oils |
Excellent |
| Halogens |
Excellent |
| Ketones |
Excellent |
| Electrical Properties |
| Dielectric constant @ 1 MHz |
2.05-2.06 |
| Dielectric constant @ 1 kHz |
2.05-2.06 |
| Dissipation factor @ 1 MHz |
0.0008 |
| Dissipation factor @ 1 kHz |
0.0001-0.0002 |
| Mechanical Properties |
| Elongation at break ( % ) |
300 |
| Tensile strength ( MPa ) |
25 |
| Physical Properties |
| Density ( g.cm-3 ) |
2.15 |
| Flammability |
V0 |
| Limiting oxygen index ( % ) |
>95% |
| Refractive index |
1.35 |
| Water absorption ( % ) |
<0.03 |
| Thermal Properties |
| Coefficient of thermal expansion ( x10-6 K-1 ) |
76-78 |
| Thermal conductivity ( W m-1 K-1 ) |
0.19 |
| Upper working temperature ( C ) |
260 |
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