Derived from standard PTFE, modified PTFE is a copolymer of tetrafluoroethylene and a small quantity of a perfluorinated modifier (perfluoropropyl vinyl ether, PPVE). The modifier content is less than 1%.
Modified PTFE can be considered a second-generation PTFE. While retaining the exceptional properties of PTFE, it offers significantly improved properties:
- lower deformation under load (cold flow reduced by a factor of three)
- denser polymer structure
- reduced permeation of chemicals and gases down to half of the standard PTFE value
- smoother surfaces on machined parts
- higher transparency
- excellent weldability
| Property | Test Method | Unit | Modified | Homoplymer |
| (1) Elastic Modulus | ASTM D 638 | MPa | 650 | 600 |
| (1) Tensile Strength | ASTM D638 | MPa | 30,0 | 35,0 |
| (1) Elongation at Break | ASTM D 638 | % | 500 | 350 |
| Specific Gravity | ASTM D 792 | g/cm3 | 2,185 | 2,170 |
| (2) Deformation under load for 24 hrs (23°C) | ASTM D 621 | % | 8,0 | 15,0 |
| (3) Permanent deformation | ASTM D 621 | % | 4,0 | 11,0 |
| (2) Deformation under load for 100 hrs (23°C) | ASTM D 621 | % | 9,0 | 17,0 |
| (4) Permanent deformation (150°C) | ASTM D 621 | % | 4,7 | 15,0 |
| Coeff. of linear thermal expansion: 25-100 °C | ASTM D 621 | 10-5/ °C | 18,0 | 13,5 |
| (5) Permeability | ASTM D 1434 | cm3/atm.24 h.m2 | 1020 | 1200 |
(1) Cross direction
(2) At 15 MPa for 24 hrs and 100 hrs at 23°C
(3) After 24 hrs relaxation at 23°C
(4) 100 hrs at 15 MPa load, 150°C and 24 hrs relaxation
(5) From skived tape at 0,125 mm thickness with oxygen
