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Properties of Unfilled and Filled PTFE
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| Property | Unit | Test Method (ASTM) | Material Type | |||||
|---|---|---|---|---|---|---|---|---|
| 100% Pure PTFE | 25% Carbon Filled PTFE | 25% Glass Filled PTFE | 15% Graphite Filled PTFE | 40% Bronze Filled PTFE | 80% Bronze Filled PTFE | |||
| Mechanical Properties | ||||||||
| Specific Gravity | - | D 1457 | 2.14 - 2.18 | 2.08 - 2.1 | 2.22 - 2.25 | 2.13 - 2.1 | 3.1 - 3.22 | 3.85 - 3.95 |
| Bulk Density | g/l | D 1457 | 700 ± 100 | 500 ± 40 | 475 ± 50 | 500 ± 40 | 900 ± 50 | 1050 ± 50 |
| Tensile Strength | kg/cm² | D 1457 | 250 - 350 | 140 - 175 | 110 - 210 | 110 - 180 | 180 - 240 | 125 - 150 |
| Elongation at Break | % | D 1457 | 280 - 300 | 80 - 110 | 210 - 270 | 100 - 180 | 240 - 320 | 150 - 200 |
| Hardness | Shore D | - | 50 - 85 | 71 - 73 | 66 - 88 | 72 - 86 | 67 - 69 | 71 - 73 |
| Coeff. of Friction | - | LNP Std. | 0.06 | 0.13 | 0.12 | 0.07 | 0.12 | 0.13 |
| Deformation after 24 Hours at 23°C | % | D - 621 | 15 | 5 | 11 | 9 | 6 | 5 |
| Deformation after 24 Hours at 260°C | % | D - 621 | 31 | 11 | 21 | 16 | 14 | 12.5 |
| Flexural Strength | kg/cm² | D - 790 | 57 | 96 | 42 | 63 | - | 80 |
| Impact Strength | Ckg/cm² | D - 258 | 9 | 7.5 | 9.5 | 11 | - | 10 |
| A - 20° C | 9 | 7.5 | 9.5 | - | - | 11 | ||
| B - 20° C | 15 | 10 | 11 | - | - | 10 | - | |
| Electrical Properties | ||||||||
| Dielectric Strength | kV/mm | D - 149 | 24 | 2 | 12 | - | Conductive | Conductive |
| Volume Resistivity | Chm/cm | D - 257 | 10¹⁸ | 10⁴ | 10¹² | 10⁴ | 10⁷ | 10⁷ |
| Surface Resistivity | Chm | D - 257 | 10¹⁷ | 10⁷ | 10¹⁵ | 10⁶ | 10⁴ | 10⁴ |
| Thermal Properties | ||||||||
| Heat Resistance | °C | - | -250 to 260 | -250 to 260 | -250 to 260 | -250 to 260 | -250 to 260 | -250 to 260 |
| Thermal Conductivity | 10⁴ Cal Sec/cm Sec Deg | - | 6 | 13 | 9 | 11 | - | 19 |
| Linear Expansion | % | D - 696 | Axial Radial | Axial Radial | Axial Radial | Axial Radial | Axial Radial | Axial Radial |
| A 30 to | 50°C | - | 1.5 1.5 | 1.2 1.0 | 1.2 1.5 | - | - | 1.1 0.9 | |
| B 30 to | 200°C | - | - | 2.4 2.4 | 1.9 1.5 | 2.2 1.0 | - | - | 1.8 1.5 |
| C 30 to | 250°C | - | - | 3.4 3.4 | 2.7 2.4 | 3.2 1.4 | 2.15 1.6 | - | 2.5 2.2 |
| Chemical Properties | ||||||||
| Chemical Resistance | - | - | PTFE is almost completely chemically inert material. Molten or dissolved alkali metals degrade PTFE by abstracting fluorine from the molecule. Apart from these, PTFE resin is not at all attacked by any of the acids, bases, and solvents. Filled PTFE has inferior chemical resistance because of the presence of the filler. |
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