PTFE (polytetrafluoretylen)
PFA (perfluoralkoxy - copolymer of tetrafluoroethylene and a perfluorinated vinyl ether)
FEP (fluorinated ethylene - propylene)
ETFE (ethylene-tetrafluoroethylene copolymer)
These types of fluoroplastics (Teflon) are used by our customers as a surface treatment of their parts. The properties of Teflon play an important role in the chemical, food and printing industry etc. The choice of a proper type of fluoroplastics (Teflon) always depends on the specific requirements by our customers - the way of use, the working conditions etc.
General | Standard |
Unit | PTFE | PFA | FEP | ETFE |
---|---|---|---|---|---|---|
Density | ISO 1183 | g/cm3 | 2.14 - 2.19 | 2.12 - 2.17 | 2.12 - 2.17 | 1.71 - 1.78 |
Working temperature |
°C | 250-260 | 250-260 | 200-205 | 150-180 | |
Combustibility | Non-flammable | Non-flammable | Non-flammable | Non-flammable | ||
Absorption (water at 23°C) |
% | <0.05 | <0.05 | <0.05 | <0.05 | |
Thermal | Standard |
Unit | PTFE | PFA | FEP | ETFE |
Melting Point | ASTM 2116 | °C | 327 | 300-310 | 253-282 | 265-275 |
Coefficient of thermal expansion | DIN 52612 | 10-5*K-1 | 10-16 | 10-16 | 10-14 | 8-12 |
Thermal conductivity (at 23°C) | W/K*m | 0.23 | 0.22 | 0.20 | 0.23 | |
Mechanical | Standard |
Unit | PTFE | PFA | FEP | ETFE |
Tensile strength |
ISO 527 | N/mm² | 29-39 | 27-32 | 19-25 | 36-48 |
při 150 °C |
14-20 | 15-21 | 4-6 | 8-12 | ||
Lenghtening at 23 °C |
ISO 527 | % | 200-500 | 300 | 250-350 | 200-500 |
Hardness (Rockwell) | ISO 2039 | 20-30 | 25-35 | 20-30 | 45-55 | |
Electrical | Standard |
Unit | PTFE | PFA | FEP | ETFE |
Dielectric constant |
D150 | 1 MHz | 2.1 | 2.1 | 2.1 | 2.6 |
Dielectric strength |
D149 | V/µm | 18 | 53 | 80 | 79 |
Scattering factor |
D150 | 1 MHz | <0.0001 | <0.0006 | <0.0001 | <0.007 |
Resistance to el. arc | D495 | sec | > 300 | > 300 | > 300 | > 300 |