PTFE PTFE Compound


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
For these reasons even the excellent performances of PTFE cannot always fulfill the customers’ expectations, most of these properties can be selectively modified and improved by mixing PTFE with organic and/or inorganic fillers. Depending on the type and proportion of such fillers, it is possible to:
  • 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
By the way, the use of fillers will give the material a lower tensile strength and a poorer elongation at break. The type of filler can influence the chemical resistance and the coefficient of friction too. Thanks to its own compounding unit, Flontech has an extensive experience not only in the compound of PTFE with standard fillers such as glass fiber, carbon, graphite, bronze and molybdenum disulphide, but also in the development of new high performance filled PTFE grades thanks to special fillers such as ceramic, PEEK, PPS, PI, LCP, carbon fiber and nano materials.
Main Typical Properties of Flontech PTFE standard compounds
                   
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 as -NFF (-1), Medium flow (-3), High flow (-6) and Very High flow (-10).
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.
Available alternative fillers
  • Aluminum oxide
  • Aramid fiber
  • Aromatic Polyester
  • Barium sulphate
  • Boron nitride
  • Calcium fluoride
  • Calcium silicate
  • Ceramic
  • Conductive carbon
  • Mica
  • Molybdenum disulfide
  • PEEK
  • Polyimide
  • PPS
  • PPSO2
  • Quartz
  • Silicon carbide
  • Titanium dioxide
  • Zinc Oxide


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