When the most critical operating conditions are present, the following features should be considered when using PTFE:
- its thermal expansion is 10% greater than that of metallic materials
- its abrasion resistance is low
- starting from a certain load level, it becomes permanently deformed due to cold flow
- its thermal and electrical conductivity are low
- increase the compressive strength, especially at high temperatures
- improve creep properties (lower cold flow)
- improve the wear resistance
- increase the thermal and electrical conductivity
- reduce the coefficient of thermal expansion improving the dimensional stability
Typical Properties\ Grade | Test Method | Units | FT-GL25-1 | FT-CAR25-1 | FT-CARR25-1 | FT-CF10-1 | FT-GR15-1 | FT-BRR40-1 | FT-STST50-1 |
↓Other available grades
FT-GL15- FT-GL20- FT-GL40- FT-GL15-M3- FT-GL15-M5- FT-GL15-M10- FT-GL20-GR5- FT-GL30-M5- FT-GL40-M5- FT-CAR10-GL10- |
↓Other available grades
FT-CAR10- FT-CAR15- FT-CAR35- FT-CAR23-GR2- FT-CAR30-GR2- FT-CAR25-CER5- FT-CAR10-GL10- |
↓Other available grades
FT-CARR10- FT-CARR15- FT-CARR35- FT-CARR23-GR2- FT-CARR15-GR5- |
↓Other available grades
FT-CFS10- FT-CF15- FT-CFS15- FT-CF20- FT-CFS20- |
↓Other available grades
FT-GR5- FT-GR10- FT-GR20- FT-GR25- FT-GR10-M3- FT-GR20-M5-CF8- |
↓Other available grades
FT-BRR35- FT-BRR60- FT-BRR25-CAR10-M5- FT-BRR30-CAR5- FT-BRR30-CF5- FT-BRR30-CF10- FT-BRR40-M5- FT-BRR55-M5- |
also with spherical Stainless Steel | |||
General | |||||||||
Filler type | - | - | Glass fibers | Hard carbon | Soft carbon | PAN carbon fibers | Graphite | Not oxidizing bronze | Stainless steel |
Nominal filler content | - | - | 25,0 | 25,0 | 25,0 | 10,0 | 15,0 | 40,0 | 50,0 |
Physical & mechanical | |||||||||
Specific gravity | ASTM D792 | g/cm3 | 2,25 | 2,12 | 2,10 | 2,12 | 2,16 | 3,10 | 3,40 |
Tensile strength (CD) | ASTM D4894 | MPa | 22,0 | 20,0 | 21,0 | 30,0 | 24,0 | 30,0 | 23,0 |
Elongation at break (CD) | ASTM D4894 | % | 250 | 100 | 220 | 300 | 220 | 320 | 230 |
Radial shrinkage | - | % | 1,5 | 2,1 | 2,5 | 1,9 | 2,4 | 2,0 | 2,0 |
Shore D hardness | - | - | 59 | 63 | 61 | 60 | 57 | 63 | 63 |
(1) Deformation under load (MD) | ASTM D621 | % | 9,0 | 5,8 | 5,8 | 8,3 | 11,1 | 9,1 | 6,6 |
(1) Deformation under load (CD) | ASTM D621 | % | 10,0 | 4,9 | 6,8 | 8,5 | 9,5 | 8,8 | 5,9 |
(2) Permanent deformation (MD) | ASTM D621 | % | 4,5 | 2,1 | 1,9 | 2,9 | 5,7 | 3,7 | 2,7 |
(2) Permanent deformation (CD) | ASTM D621 | % | 6,0 | 1,8 | 1,8 | 2,9 | 4,4 | 3,3 | 2,1 |
Compressive stress 1% deformation (MD) | ASTM D695 | 9,5 | 11,0 | 10,5 | 8,1 | 7,0 | 8,0 | 10,5 | |
Compressive stress 1% deformation (CD) | ASTM D695 | 9,0 | 11,0 | 10,5 | 8,6 | 7,0 | 8,0 | 10,0 | |
Compressive stress 25% deformation (MD) | ASTM D695 | 29,0 | 40,0 | 38,0 | 33,0 | 29,0 | 33,0 | 38,5 | |
Compressive stress 25% deformation (CD) | ASTM D695 | 28,0 | 37,5 | 39,0 | 34,0 | 30,0 | 33,0 | 38,5 | |
Thermal & electrical | |||||||||
Coefficient of linear thermal expansion | ASTM D696 | 10-5/°C | |||||||
25-100°C (MD) | 11,2 | 11,6 | 10,9 | 14,1 | 13,5 | 10,6 | 11,8 | ||
25-100°C (CD) | 7,7 | 6,7 | 8,8 | 10,1 | 8,1 | 9,5 | 10,4 | ||
25-150°C (MD) | 11,8 | 12,7 | 11,3 | 14,0 | 14,7 | 11,7 | 12,0 | ||
25-150°C (CD) | 8,5 | 7,2 | 9,3 | 11,2 | 9,2 | 10,4 | 10,4 | ||
25-200°C (MD) | 12,8 | 14 | 12,2 | 14,7 | 16,5 | 12,9 | 12,9 | ||
25-200°C (CD) | 9,5 | 8,5 | 10,2 | 12,7 | 10,4 | 12 | 11,3 | ||
25-250°C (MD) | 15,1 | 15,4 | 14,2 | 15,8 | 19,2 | 14,9 | 14,5 | ||
25-250°C (CD) | 11,5 | 10 | 11,8 | 15,1 | 12,4 | 13,8 | 13,3 | ||
Thermal conductivity | ASTM C177 | W/m.K | 0,41 | 0,59 | 0,60 | 0,39 | 0,75 | - | - |
Volume resistivity | ASTM D257 | Ohm.cm | 1,00E+15 | 1,00E+04 | 1,00E+04 | 1,00E+06 | 1,00E+07 | 1,00E+12 | 1,00E+12 |
Wear | |||||||||
(3) Wear coefficient | INTERNAL | 10-8.cm3.min/Kg.m.h | - | 30-40 | 110-200 | 80-120 | 1750 | 5-15 | 50-60 |
(4) Friction coefficient PTFE/Steel | |||||||||
Static | ASTM D1894 | - | - | 0,15 | 0,13 | 0,14 | 0,13 | 0,15 | 0,16 |
Dynamic | - | 0,11 | 0,10 | 0,10 | 0,10 | 0,11 | 0,13 |
MD: moulding direction CD: cross direction
(1) Load 140 Kg/cm2for 24h at 23°C
(2) Permanent deformation after 24h relaxation at 23°C
(3) PV = 10 Kg.m/(cm2.min)
(4) Roughness: 0.25-0.35 µ
Reference:
The mechanical properties have been evaluated from a 50x50 mm rod. moulded and sintered according to the following conditions:
preforming pressure | 30 Mpa for all PTFE virgin grades and compounds with filler content ≤10%) |
50 Mpa for compounds with filler content >10% | |
syntering cycle | total time of 15 hrs, with 2 hrs and 40 min at max temperature of 370°C |
All Flontech compound grades are available both as virgin PTFE based and modified PTFE based polymer.
Specific composition grades are available upon request using propietory type of fillers/pigments and/or fillers/pigments combination.