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Poly Tetra Fluoro Ethylene(PTFE)

Sl. No. Property Unit Test Method Virgin PTFE 15% Glass Filled PTFE 25% Glass Filled PTFE 25% Carbon Filled PTFE 15% Graphite Filled PTFE 40% Bronze Filled PTFE 60% Bronze Filled PTFE 55% Bronze + 5% MoS2
1 Density gm/cc ASTM D-792 2.1-2.2 2.23-2.24 2.24-2.25 2.12-2.14 2.14-2.16 3.1-3.2 3.75-3.8 3.8-3.9
2 Tensile Strength kgf/cm2 ASTM D-638 210-350 150-225 125-200 120-155 150-200 125-150 105-140 110-145
3 Elongation of break % ASTM D-638 250-400 225-325 200-300 100-150 175-225 100-175 80-160 90-165
4 Compressive Strength kgf/cm2 ASTM D-695 40-50 65-75 75-85 75-85 65-75 85-100 115-125 115-125
5 Compressive Modules kgf/cm2 ASTM D-695 4000 6000 7000 8400 8000 8500 8800 8800
6 Deformation
  • 2 Hrs 23 C 113 kg/cm2
  • 2 Hrs 23 C 113 kg/cm2
  • Permanent
  • 2 Hrs 150 C 113 kg/cm2
% ASTM D-621  
  • 12
  • 15
  • 8
  • 55
 
  • 10
  • 12
  • 7.5
  • 52
 
  • 9
  • 11
  • 7
  • 50
 
  • 5
  • 7
  • 3.5
  • 35
 
  • 6
  • 8
  • 4.5
  • 43
 
  • 5
  • 6
  • 3
  • 42
 
  • 4
  • 5
  • 2.5
  • 40
 
  • 4
  • 5
  • 2.5
  • 40
7 Flexural Strength kgf/cm2 ASTM D-790 57 50 42 96 60 85 80 80
8 Flexural Modules kgf/cm2 ASTM D-790 3500-6300 20000 16700 11900 11000 14000 13800 13500
9 Impact Strength
  • -20 C
  • +20 C
     
  • 9
  • 15
 
  • 9.25
  • 12.5
 
  • 9.5
  • 10
 
  • 8
  • 11
 
  • 10
  • 14
 
  • 11
  • 9
 
  • 11
  • 10
 
  • 11
  • 10
10 Hardness Shore D ASTM D-2240 60.65 65-70 70-75 70-75 60-75 70-75 70-75 70-75
11 Coefficient of Friction
  • Dynamic P-7 kg/cm2 V-05 m/s
  • Static P-35 kg/cm2
  -----  
  • 0.04-0.06
  • 0.05-0.08
 
  • 0.31-0.37
  • 0.1-0.12
 
  • 0.5-0.54
  • 0.11-0.13
 
  • 0.12-0.17
  • 0.09-0.11
 
  • 0.11-0.16
  • 0.08-0.10
 
  • 0.11-0.15
  • 0.08-0.1
 
  • 0.12-0.16
  • 0.08-0.1
 
  • 0.1-0.14
  • 0.07-0.09
12 Water Absorption 5 ASTM D-570 0 0.015 0.013 0 0 0 0 0
13 Head Resistance of Atm. Pressure °C ---- -250 to +260 -250 to +260 -250 to +260 -250 to +260 -250 to +260 -250 to +260 -250 to +260 -250 to +260
14 Thermal Conductivity 10 cal cmS C cenco Fitch 6 8 9 13 14 17 19 19
15 Linear Thermal Expansion
  • 30-150 C
  • 30-200 C
  • 30-250 C
% ASTM D-696
Axial
  • 1.5
  • 2.4
  • 3.4
Radial
  • 1.5
  • 2.3
  • 3.6
Axial
  • 1.5
  • 2.3
  • 3.3
Radial
  • 1.0
  • 1.8
  • 2.2
Axial
  • 1.5
  • 2.2
  • 3.2
Radial
  • 0.7
  • 1.0
  • 1.4
Axial
  • 1.2
  • 1.9
  • 2.7
Radial
  • 1.0
  • 1.5
  • 2.4
Axial
  • 1.3
  • 2.0
  • 3.0
Radial
  • 1.0
  • 1.7
  • 2.5
Axial
  • 1.15
  • 1.85
  • 2.55
Radial
  • 0.95
  • 1.55
  • 2.25
Axial
  • 1.1
  • 1.8
  • 2.5
Radial
  • 0.9
  • 1.5
  • 2.2
Axial
  • 1.1
  • 1.8
  • 2.5
Radial
  • 0.9
  • 1.5
  • 2.2
16 Dielectric Strength Kv/mm ASTM D-149 24 16 12 2 2 Conductive Conductive Conductive
17 Volume Resistivity ohm cm ASTM D-257 1018 1015 1015 104 103 107 107 107
18 Surface Resistivity ohm ASTM D-258 1015 1015 1015 107 104 109 109 109
19 Chemical Resistence: PTFE is chemically inert & unaffected by all know chemicals except molten or dissolved alkali metal - Sodium, Potassium, Rubidium, Cesium, Francium & Fluorine gas, certain compounds & complexes of elevated temperatures.
Filled PTFE has inferior chemical resistance because of the presence of the particular fillers.
Data quoted are average value only & should not be used as specifications for designing specific applications.

Properties of Engineering Plastics at a Glance

ASTM PTFE UHMW-PE NYLON 6 CAST NYLON ACETAL DELRIN PP HDPE PVC
Specific gravity D792 2.14-2.20 0.994 1.12-1.14 1.15-1.17 1.41 0.902-0.910 0.941-0.965 1.30-1.58
p.s.i. Tensile Strength D638 2000-5000 2500-3500 10000-11800 11000-14000 8800 4300-5500 3100-5500 6000-7500
% Elongation D638 200.0-400.0 500 100-300 30-320 40-75 200.0-700.0 20-1300 40-80
p.s.i. Comprehesive D695 1700 2400 13000 --- 16000 5500-8000 2700-3600 8000-13000
Impact strength (1/2 x 1/2 in notched) D256 3.0 No Break 10-3.0 0.8-30 ( 1/2 1/2 inbar) 1.0-1.5 ( 1/2 x 1/2 inbar) 0.5-2at ( 1/8 x 1/2 inbar) 0.5-20.0 0.4 - 20.0
Hardness Rockwell D785 D50-D55 (Shore) D60 - D70 (Shore) R119 R95-R120 M78-M80 80-110 D60-D70 (Shore) 65-85 (Shore)
105 p.s.i. 73° F Flexural Modulus D790 --- 1.30-1.40 3.9a-1.4b 1.1-4.5a
0.8-1.6b
3.75 1.7-2.5 1.0-2.6 3-5
Coefficient of friction --- 0.04
0.1
0.03
0.08
0.37 0.35 0.18 0.3 0.08
0.18
0.45
-104 cal sec cm3 C cm Thermal conductivity C177 6.0 11-12.4 5.8 --- 5.5 2.8 11.0-12.4 3.5-5.0
Thermal expansion 105 per °C D696 10.0 7.2 8.3 9.0 8.5 5.8-10.2 11.0-13.0 5.0-10.0
Resistance to heat °C (continuous) 260 °C 120 °C 80 °C
120 °C
121 °C
149 °C
80 °C
120 °C
110 °C 80 °C 65 °C
75 °C
Ω - cm (230 C50%) Volume resistivity D257 1018 1016 1011-1014 --- 10x1014 1016 1016 1016
1/8 in thickness volts mil Dielectric strength D149 480 710 400 300-400 50 (90 mil) 500-660 450-500 350-500
1 KHz Dielectric constant D150 2.1 2.25-2.35 3.7 3.7 3.7 2.2-2.6 2.30-2.35 3.0-3.8
1 KHz Dissipation (power) factor D150 0.0002 0.00021 0.02 0.02 0.0010 (40 mil) 0.0005
0.0018
0.0005 0.009-0.017
24-i3.2 mm % water absorption 24 hr. 3.2 thickness, % D570 0.00 0.01 1.3-1.9 0.6-1.2 0.22 0.01-0.03 0.01 0.04-0.4
in min. Buring rate D635 --- --- --- --- 1.0-1.1 0.75-0.82 1.00-1.04 ---
Effect of weak acids D543 NONE very resistant Resistant Resistant Resistant to same
Effect of strong acid D543 NONE Attacked slowely by oxidizing acids Attacked Attacked Attacked Attacked slowely by oxidizing acids Attacked slowely by oxidizing acids NONE
Effect of Weak Alkalies D543 NONE Very Resistant NONE NONE Attacked NONE Very resistant NONE
Effect of Strong Alkalies D543 NONE Very Resistant Resistant Resistant Attacked Resistant Very resistant NONE
Effect of organic solvents D543 NONE Resistant Below 80 °C Resistant to common solvents Resistant to common solvents Excellent resistance to practically solvents Resistant below 80 °C Resistant below 80 °C Resistant Alcohols aliphatic hydrocarnons
and oils solule in ketones and esters swells
in aromatic hydrocarbons
Data quoted are average values only & should not be used as specifications for designing specific applications.