Graphite Filled PTFE
Graphite-Filled PTFE sheets, rods and tubes. It has much better wear resistance than virgin PTFE materials with slightly higher coefficients of friction.
What is Graphite-filled PTFE?
Graphite-filled PTFE is a high-performance composite material made by blending virgin PTFE with graphite powder (usually 5% to 25%). The graphite filler acts as a solid lubricant, resulting in the material having the lowest coefficients of friction. It has superior self-lubricating properties, exceptional wear resistance, and high thermal conductivity.
The most common graphite percentages in PTFE are 5%, 10%, 15%, 20%, and 25%. Graphite and carbon are always used together with PTFE.
Features and advantages
Graphite-filled PTFE material has exceptional chemical resistance in corrosive environments and excellent wear resistance in both dry and wet environments. It has a low coefficient of friction compared to other filled PTFE materials and excellent wear properties.
Applications
Graphite-filled PTFE material is suitable for dynamic reciprocating and rotary applications. It is also ideal for rider rings, pistons, and wear-resistant gaskets and seals.
Physical Properties of Graphite Filled PTFE
| Test Items | Test Methods | Unit | 10% Graphite | 15% Graphite |
|---|---|---|---|---|
| Density | ASTM D792 | g/cm3 | 2.12 | 2.1 |
| Hardness Shore D | ASTM D2240 | Sh.D | 61 | 62 |
| Tensile strength | ASTM D4745 | mpa | 18 | 17 |
| Elongation at break 23°C | ASTM D4745 | % | 185 | 170 |
| Coefficient of static friction | ASTM D1894 | - | 0.13 | 0.15 |
| Max water absorption | ASTM D570 | % | 0 | 0 |