TECHNICAL INFORMATION

General : Corrosion resistance : Physical properties

 

Physical properties of important plastics.

Properties Standard Units PTFE PFA FEP ETFE PVDF PP
Mechanical                
density DIN 53479 g/cm3 2.15 2.15 2.15 1.70 1.78 0.90
tensile strength DIN 53455 N/mm2 20-40 24-30 21-28 44 40-60 33
elongation at break DIN 53455 % 140-400 300 240-350 200 20-80 20-800
tensile modulus DIN 53457 N/mm2 350-750 280 350-500 900-1300 2400 1100-1300
flexural modulus ASTM D790 N/mm2 500 620-670 650-670 1300 2250  
flexural stress DIN 53452 N/mm2 5.6 18 18 >12 74 47
impact strength ASTM D256 J/m 189 no break no break no break    
hardness shore'D' DIN 53505   55 55 55 75 78 73
Coefficient of friction, dynamic ASTM D1894 <3m/min 0.1 0.2 0.2 0.23    
abrasion resistance DIN 53754 mm3/1000 u 400   3.5   2.8-5.7 150-200
Thermal                
linear thermal expansion coefficient ASTM D696 10^-5K^-1 12-20 14 9-11 8-12 12.8 15
upper permanent service temp. limit   deg. C 260 260 205 155 150 100
lower permanent service temp. limit   deg. C -200 -190 -190 -190 -40 -15
Vicat-point B DIN 53460/B deg. C 130-140 74 70   142 102
thermal conductivity DIN 52612 W/mK 0.24 0.19 0.25 0.23 0.19 0.22
specific heat capacity   kJ/kg K 1.0   1.12 1.95 0.96 1.7
melting point DIN 53736 deg. C -- 305 275 270 178 165
oxygen index ASTM D2863 % 95 95 95 30 43.7  
fire class UL 94   V-0 V-0 V-0 V-0 V-0 HB/V-2
Electrical                
surface resistivity DIN 53482 ohm >10^17 >10^18 >10^16 5X10^14 >10^13 10^13
volume resistivity DIN 53482 ohm .cm >10^18 >10^18 >10^16 >10^16 5X10^14 >10^17

dielectric strength (foil. 0.2-0.25 mm)

 ASTM D149 kV/mm >20 >80 83 >80 30-60 75
dielectric constant (10^6Hz) ASTM D150   2.1 2.1 2.1 2.6 7.5 2.3
dielectric factor (10^6Hz) ASTM D150   >0.0003 0.0001 0.0006 0.005 0.185 <0.001
General                
weather resistance Florida exposure years unaffected 20 20 10 15