Technical Data Sheet - TDS - Physical Properties of PTFE & Filled PTFE Products


Physical properties of Virgin PTFE & Filled Grade of PTFE are dependent upon many factors such as Grades of PTFE – Conventional, Modified PTFE or Filled PTFE, Particle size of resin – Fine Cut or Coarse, Particle Shape of Resin – Spherical, Flake, Irregular, Type & content of filler, Manufacturing Process – Compression Molding, Ram Extrusion, Isostatic, Paste Extrusion. Due to this – Physical Properties of PTFE & Filled PTFE Products – have the wide range of Values:-
Sr. No. Property Unit Test Method Virgin PTFE Chemically Modified PTFE 15% Glass Filled PTFE 25% Glass Filled PTFE 5% Glass +5% MoS2 Filled PTFE 15% Glass +5% MoS2 Filled PTFE 25% Carbon / 23% Carbon + 2% Graphite Filled PTFE 35% Carbon / 33% Carbon + 2% Graphite Filled PTFE 15% Graphite Filled PTFE 40% Bronze/ TSQ Filled PTFE 40% Bronze + 5% MoS2 Filled PTFE 60% Bronze Filled PTFE 55% Bronze + 5% MoS2 Filled PTFE
1 2 3 4 5 6 7 8 9 10 11 12 13
1 Density gm / cc ASTM D-792 2.1 – 2.2 2.15 – 2.2 2.15– 2.22 2.22– 2.25 2.20 – 2.24 2.20– 2.24 2.0 – 2.2 2.0 – 2.14 2.10– 2.16 3.0 – 3.2 3 – 3.2 3.8 – 4.0 3.8 – 4
2 Tensile Strength kgf/cm2 ASTM D-638 210 – 375 300 – 325 180– 260 125– 200 175– 250 150– 220 125–200 100– 175 150– 200 125– 225 125-225 100– 200 100-200
3 Elongation of Break % ASTM D-638 250 – 400 400 – 450 225-325 200-300 200-300 220-320 80–150 100-150 150-250 200-350 200-350 150-300 150-300
4 Compressive Strength kgf/cm2 ASTM D-695 40-50 45-55 65-75 75-85 60-70 65-75 75–85 80-90 65-75 85-100 80-95 115-125 115-125
5 Deformation under load (Max.)   ASTM D-621                          
a 2 Hrs. 230C 113 kgf % 12 3.5 10 9 11 10 5 4 6 5 5 4 4
b 24 Hrs. 230C 113 kgf   15 5 12 11 13 12 7 6 8 6 6 5 5
c Permanent   8 2.5 7.5 7 8.5 7.5 3.5 3 4.5 3 3 2.5 2.5
d 2 Hrs. 1500C 113 kgf   55 40 52 50 52 50 35 30 43 42 42 40 40
6 Impact strength J/cm ASTM D-256 1.4 – 1.5 1.6 – 1.75 1.2 – 1.3 1.0 – 1.1 1.25 – 1.35 1.2 – 1.3 0.7 – 0.8 0.6 – 0.7 0.8 – 0.9 0.9 – 1.0 0.9 – 1.0 0.8 – 0.9 0.85 – 0.95
7 Hardness Shore D ASTM D-2240 58 – 62 56 – 62 58 – 62 58 – 63 60 – 65 60 – 65 60 – 65 60 – 65 60 – 65 62 – 66 62 – 66 64 – 68 64 – 68
8 Coefficient of Friction   ASTM-D-1894             -            
a DynamicP-7 kg/cm2V-0.5     0.04-0.06 0.02-0.03 0.31-0.37 0.5-0.54 0.15-0.20 0.15-0.20 0.12-0.17 0.13-0.18 0.11-0.16 0.11-0.15 0.1-0.14 0.12-0.16 0.11-0.14
b Static P-35 kg/cm2 0.05-0.08 0.04-0.06 0.01-0.12 0.11-0.13 0.08-0.01 0.08-0.01 0.09-0.11 0.01-0.12 0.08-0.10 0.08-0.10 0.075-0.09 0.08-0.10 0.07-0.09
9 Wear Rate (Max.) gm/s ASTM-G-137 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
10 Water Absorption (Max.) % ASTM D-570 0 0 0.015 0.013 0.015 0.015 0 0 0 0 0 0 0
11 Continuous Service Temperature 0 C ASTM-D-648 +260 +260 +260 +260 +260 +260 +260 +260 +260 +260 +260 +260 +260
12 Heat Resistance (Max.) % ASTM-D-648 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
13 Coefficient of Linear Thermal Expansion– 10-6 X % ASTM D-696 250 – 275 250 – 275 240 – 265 235 – 255 245 – 270 240 – 265 225 – 250 215 – 240 240 – 265 200 – 225 200 – 225 175 – 200 175 – 200
14 Linear Thermal Expansion (Max.) % ASTM D-696 A R A R A R A R A R A R A R A R A R A R A R A R A R
a 30 – 1500 C 1.5 1.5 1.5 1.5 1.5 1 1.5 0.7 1.5 1 1.5 1 1.2 1 1.1 0.9 1.3 1 1.15 0.95 1.15 0.95 1.1 0.9 1.1 0.9
b 30 – 2000 C 2.4 2.3 2.4 2.3 2.3 1.8 2.2 1 2.3 1.8 2.3 1.8 1.9 1.5 1.8 1.4 2 1.7 1.85 1.55 1.85 1.55 1.8 1.5 1.8 1.5
c 30 – 2500 C 3.4 3.6 3.4 3.6 3.3 2.2 3.2 1.4 3.3 2.2 3.3 2.2 2.7 2.4 2.5 2.3 3 2.5 2.55 2.25 2.55 2.25 2.5 2.2 2.5 2.2
15 Dielectric Strength Kv/mm ASTM D-149 22 – 24 30 – 35 15 – 16 11 – 12 15 – 16 15 – 16 1 – 2 1 – 2 1 – 2 Conductive Conductive Conductive Conductive
16 Dimensional stability   % % ASTM-D-1710 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3 1.5 – 3
a Length
b Diameter 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1 0.5 – 1
17 Chemical Resistance (Max.)   % % ASTM-D-543   0.01   0.01   0.01   0.01   0.01   0.01   0.01   0.01   0.01   0.01   0.01   0.01   0.01
a Permeability
b Dissolution 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01
c PTFE is chemically inert & unaffected by all known chemicals except molten or dissolved alkali metals–Sodium; Potassium; Rubidium; Cesiurn; Francium & Fluorine gas, certain fluorine compounds & complexes at elevated temperatures. Filled PTFE has inferior chemical resistance depending upon the particular filler.
  The physical properties of Standard & Non-standard filled grade composition not mentioned in above table are to be referred on the basis of Material Test Certificate issued by Raw Material Supplier / Manufacturer.Data quoted are average values only & should not be used for designed purpose.
  Company has in-house test facility / Laboratory to test above properties. The testing equipments are calibrated as per procedures laid down in QMS-ISO-9001:2008, having traceability with NPL. The test procedures are self designed, similar to above referred ASTMs.