Physical Properties of PTFE & Filled PTFE Compositions.
Sr. No.

Property

Unit

 Test
Method		 Virgin
PTFE		 Chemically Modified
PTFE		 15%Glass
Filled PTFE		 25%Glass
Filled PTFE		 15%Glass Fibre+5%MoS2 Filled PTFE 25%Carbon#  Filled PTFE 35% 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 2.15 - 2.2 2.10-2.24 2.24-2.25 2.23-2.24 2.10-2.20 2.11-2.13 2.14-2.16 3.1-3.2 3.80-4.00 3.8-4.00
2. Tensile Strength kgf/cm2 ASTM D-638 210-375 325 150-225 125-200 150-220 125-200 100-175 150-200 125-150 105-140 110-145
3. Elongation  of break % ASTM D-638 250-400 400-450 225-325 200-300 220-320 100-150 90-125 175-225 100-175 150-300 150-300
4. Compressive Strength kgf/cm2 ASTM D-695 40-50 45-55 65-75 75-85 65-75 75-85 80-90 65-75 85-100 115-125 115-125
5. Compressive Modulus kgf/cm2 ASTM D-695 4000 4500 6000 7000 6000 8400 8700 8000 8500 8800 8800
6. Deformation under load.  
A. 2 Hrs. 23oC 113 kg/cm2

%

 ASTM D-621

 

 12 3.5 10 9 10 5 4 6 5 4 4
B. 24 Hrs. 23oC 113 kg/cm2 15 5 12 11 12 7 6 8 6 5 5
C. Permanent 8 2.5 7.5 7 7.5 3.5 3 4.5 3 2.5 2.5
D. 2 Hrs. 150oC 113 kg/cm2 55 40 52 50 50 35 30 43 42 40 40
7. Flexural  Strength kgf/cm2 ASTM D-790 57 60 50 42 50 96 90 60 85 80 80
8. Flexural  Modulus kgf/cm2 ASTM D-790 3500-6300 7000 20000 16700 20000 11900 10500 11000 14000 13800 135
9. Impact strength
A. -200C cmkgf/cm2 ASTM D-256 9 9 9.25 9.5 9 8 9.5 10 11 11 11
B. +200C 15 15 12-5 11 12 10 12 14 9 10 10
10. Hardness Shore D ASTM D-2240 60-65 60-65 65-70 70-75 62-68 70-75 72-80 60-65 70-75 70-75 70-75
11. Coefficient of Friction   ___  
A. Dynamic P-7 kg/cm2 V-0.5 m/s 0.04-0.06 0.02-0.03 0.31-0.37 0.5-0.54 0.15-0.20 0.12-0.17 0.13-0.18 0.11-0.16 0.11-0.15 0.12-0.16 0.01-0.14
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 0.09-0.11 0.01-0.12 0.08-0.10 0.08-0.1 0.08-0.01 0.07-0.09
12. Water  Absorption % ASTM D-570 0 0 0.015 0.013 0.015 0 0 0 0 0 0
13. Heat  Resistance at Atm. Pressure 0C ___ -250 to +260 -250 to +260 -250 to +260 -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 10-4 cal cm S0C cenco Fitch 6 6 8 9 9 13 14 14 17 19 19
15. Liner Thermal  Expansion % ASTM D-696 Axial Radial Axial Radial Axial Radial Axial Radial Axial Radial Axial Radial Axial Radial Axial Radial Axial Radial Axial Radial Axial Radial
A. 30-150oC 1.5 1.5 1.5 1.5 1.5 1.0 1.5 0.7 1.5 1.0 1.2 1.0 1.1 0.9 1.3 1.0 1.15 0.95 1.1 0.9 1.1 0.9
B. 30-200oC 2.4 2.3 2.4 2.3 2.3 1.8 2.2 1.0 2.3 1.8 1.9 1.5 1.8 1.4 2.0 1.7 1.85 1.55 1.8 1.5 1.8 1.5
C. 30-250oC 3.4 3.6 3.4 3.6 3.3 2.2 3.2 1.4 3.3 2.2 2.7 2.4 2.5 2.3 3.0 2.5 2.55 2.25 2.5 2.2 2.5 2.2
16. Dielectric Strength Kv/mm ASTM  D-149 24 30-35 16 12 16 2 2 2 Conductive Conductive Conductive
17. volume Resistivity ohm cm ASTM D-257 1018 1020 1015 1015 1015 104 104 103 107 107 107
18. Surface Resistivity ohm ASTM D-258 1015 1018 1015 1015 1015 107 107 106 109 109 1010
19. Chemical  Resistance : PTFE is chemically inert & unaffected by all known chemicals except molten or dissolved alkali metals - Sodium; Potassium; Rubidium; Cesium; Francium & Fluorine gas, certain fluorine compounds & complexes at elevated temperatures. Filled PTFE has inferior chemical resistance depending upon the particular filler.
 

# Properties are of Soft - Amorphous  carbon filled PTFE.  Properties of Hard carbon fibre filled  PTFE :
Improved compressive properties, Improved wear properties & hardness,  Improved flexural strength, Slightly inferior tensile properties as  Compared to Soft -  Amorphous carbon filled PTFE.

* 1. Data quoted are average values & may vary with source and raw material.
2. Values may be used for design with consideration of factor of safety.
3. Company do not accepts any responsibility of results obtained and infringement of any patents.