Properties for Molded PTFE

 

Properties for Molded Polytetrafluoroethylene (PTFE)
Physical Properties Metric English
Bulk Density 0.300 – 0.930 g/cc 0.0108 – 0.0336 lb/in³
Density 0.700 – 2.30 g/cc 0.0253 – 0.0831 lb/in³
Apparent Bulk Density 0.360 – 0.950 g/cc 0.0130 – 0.0343 lb/in³
Water Absorption 0.000 – 0.100 % 0.000 – 0.100 %
Particle Size 0.250 – 800 µm 0.250 – 800 µm
pH 9.5 9.5
Viscosity 19.0 – 25.0 cP 19.0 – 25.0 cP
1.00e+13 – 1.00e+15 cP 1.00e+13 – 1.00e+15 cP
@Temperature 340 – 380 °C @Temperature 644 – 716 °F
Thickness 12.0 – 25.0 microns 0.472 – 0.984 mil
Linear Mold Shrinkage 0.0200 – 0.0580 cm/cm 0.0200 – 0.0580 in/in
Deformation 0.200 – 14.0 % 0.200 – 14.0 %
Surface Tension 32.0 – 35.0 dynes/cm 32.0 – 35.0 dynes/cm
Mechanical Properties Metric English
Hardness, Shore D 50.0 – 65.0 50.0 – 65.0
Ball Indentation Hardness 27.0 – 37.0 MPa 3920 – 5370 psi
Tensile Strength, Ultimate 10.0 – 45.0 MPa 1450 – 6530 psi
Tensile Strength, Yield 0.862 – 41.4 MPa 125 – 6000 psi
Elongation at Break 40.0 – 650 % 40.0 – 650 %
Modulus of Elasticity 0.392 – 2.25 GPa 56.9 – 326 ksi
Flexural Modulus 0.490 – 3.36 GPa 71.1 – 488 ksi
Flexural Yield Strength 14.0 – 27.6 MPa 2030 – 4000 psi
Compressive Yield Strength 1.50 – 23.4 MPa 218 – 3400 psi
Shear Strength 9.31 – 25.5 MPa 1350 – 3700 psi
Izod Impact, Unnotched 1.60 J/cm 3.00 ft-lb/in
Charpy Impact, Notched 0.500 – 1.90 J/cm² 2.38 – 9.04 ft-lb/in²
Coefficient of Friction 0.00800 – 0.280 0.00800 – 0.280
Coefficient of Friction, Static 0.0200 – 0.0800 0.0200 – 0.0800
K (wear) Factor 403 – 5040 x 10-8 mm³/N-M 200 – 2500 x 10-10 in³-min/ft-lb-hr
Taber Abrasion, mg/1000 Cycles 0.000 – 41.8 0.000 – 41.8
Izod Impact, Notched 1.30 – 1.57 J/cm 2.44 – 2.94 ft-lb/in
Electrical Properties Metric English
Electrical Resistivity 1.00e+10 – 1.10e+18 ohm-cm 1.00e+10 – 1.10e+18 ohm-cm
Surface Resistance 1.00e+10 – 1.00e+18 ohm 1.00e+10 – 1.00e+18 ohm
Dielectric Constant 2.00 – 12.0 2.00 – 12.0
Dielectric Strength 10.0 – 165 kV/mm 254 – 4200 kV/in
Dissipation Factor 0.0000100 – 0.0360 0.0000100 – 0.0360
Arc Resistance 300 – 420 sec 300 – 420 sec
Comparative Tracking Index 600 V 600 V
Thermal Properties Metric English
CTE, linear 14.0 – 250 µm/m-°C 7.78 – 139 µin/in-°F
120 – 170 µm/m-°C 66.7 – 94.4 µin/in-°F
@Temperature 30.0 – 300 °C @Temperature 86.0 – 572 °F
Specific Heat Capacity 1.00 – 1.05 J/g-°C 0.239 – 0.251 BTU/lb-°F
0.960 – 1.03 J/g-°C 0.229 – 0.246 BTU/lb-°F
@Temperature 0.000 – 50.0 °C @Temperature 32.0 – 122 °F
Thermal Conductivity 0.240 – 4.07 W/m-K 1.67 – 28.2 BTU-in/hr-ft²-°F
Melting Point 135 – 340 °C 275 – 644 °F
Maximum Service Temperature, Air 93.3 – 316 °C 200 – 600 °F
Deflection Temperature at 1.8 MPa (264 psi) 50.0 – 100 °C 122 – 212 °F
Minimum Service Temperature, Air -268 – -200 °C -450 – -328 °F
Flammability, UL94 V-0 V-0
Oxygen Index 92.0 – 95.0 % 92.0 – 95.0 %
Processing Properties Metric English
Mold Temperature 370 °C 698 °F
Injection Pressure 16.0 – 30.0 MPa 2320 – 4350 psi
Back Pressure 15.0 – 40.0 MPa 2180 – 5800 psi

Additional References