PTFE Modified PTFE


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
Comparison of main typical properties of modified and homopolymer Flontech PTFE
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


VAT N. IT 01406020162 | REA N. 203233 - Cod.Mecc. BG 003351
Cap. Sociale € 10.000.000 interamente versato
Flontech