Properties of Molded Polytetrafluoroethylene
(PTFE)
|
Physical Properties
|
Metric
|
Imperial
|
| 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
|
Imperial
|
| 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
|
Imperial
|
| 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
|
Imperial
|
| 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
|
Imperial
|
| 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 |
