What are Oil-Free Air Compressor PTFE Piston Cup Seals
Oil-free Air compressor PTFE piston cup seals are extensively used for steam, oil, water, and other chemical applications. Most rings are made of self-lubricating materials such as virgin PTFE and filled PTFE compounds like carbon-filled PTFE and graphite-filled PTFE, etc.
Our piston seals are extensively acclaimed as perfect pressure-energized seals which ensure good flexibility. These can be easily fitted with a high degree of preload to maintain sealing at very low pressures. Following the demands of clients, we provide these in various dimensions and specifications.
Features
- Low friction coefficient: PTFE is a material with a very low friction coefficient, which allows the piston cup seal to have minimal friction loss during movement.
- Good wear resistance: PTFE seals have excellent wear resistance and can be used under high-speed and high-pressure conditions for a long time without being easily worn.
- Good sealing performance: Oil-free Air compressor PTFE piston cup seals have excellent sealing performance and can effectively prevent gas or liquid leakage.
- Wide temperature range: PTFE seals are capable of operating over a wide temperature range, with excellent performance stability from very low temperatures to high temperatures. This makes them suitable for applications in a variety of environmental conditions.
- Self-lubricating: It has a low coefficient of friction and excellent friction and wear resistance, as well as during dry friction. It can be operated under conditions where the grease cannot be used, such as under the ultra-low temperature conditions of liquid hydrogen and liquid oxygen.
- Shock absorption: It has good shock absorption and is especially suitable for places where noise and vibration are needed.
- The vacuum performance is good: The gas-out property of the polymer material in a vacuum is remarkably smaller than that of the grease so it can be used well under ultra-high vacuum conditions.
Applicable working conditions
PTFE piston cup seals are suitable for oil-free air compressors under various working conditions, including but not limited to the following situations:
■ High-temperature environment: PTFE seals have excellent high-temperature resistance and can maintain stable performance under high-temperature conditions. They can withstand high temperatures and thermal cycles without softening, melting, or deforming, ensuring a reliable seal.
■ High-pressure working conditions: Oil-free Air compressor PTFE piston cup seals have good wear resistance and chemical stability, and can be used under high-pressure conditions for a long time without being easy to wear or fail.
■ Corrosive media: Due to the excellent chemical stability of PTFE, PTFE seals can resist erosion by chemicals such as acids, alkalis, and solvents. Therefore, they are suitable for applications handling corrosive gases or liquids, maintaining sealing performance, and preventing media leakage.
■ High-speed movement: The low friction coefficient of the piston cup seal results in less friction loss under high-speed movement. Therefore, they are suitable for high-speed rotating compressor piston systems and can provide stable sealing effects.
■ Dry environment: Since oil-free air compressors do not require lubricating oil, PTFE piston cup seals can operate in dry environments. This makes them suitable for applications with high dry air requirements, such as food processing, electronics manufacturing, etc.
Physical property information of PTFE
| Physical Properties | Rating (Metric) | Rating (Imperial) | Test Method |
| Density | 2.14 - 2.18 g/cc | 0.0773 - 0.0788 lb/in³ | ASTM D792 |
| Deformation | 7.0-9.0% @Pressure 13.7 MPa, Time 86400 sec |
7.0-9.0% @Pressure 1990 psi, Time 24.0 hours |
after 24hr relaxation; ASTM D621 |
| Mechanical Properties | Ratings (metric) | Ratings (imperial) | Test Methods |
| Shore Hardness (Shore D) | 51 - 60 | 51 - 60 | extruded; ASTM D2240 |
| Tensile strength | >= 20.0 MPa | >= 2900 psi | extruded; ASTM D4894 |
| Elongation (break) | >= 200 % | >= 200 % | extruded; ASTM D4745 |
| Compressive yield strength | 4.00 - 5.00 MPa @Strain 1.00 % |
580-725 psi @Strain 1.00 % |
ASTM D695 |
| Dynamic friction coefficient | 0.060 | 0.060 | ASTM D1894 |
| Electrical Properties | Ratings (Metric) | Ratings (Imperial) | Test Methods |
| Dielectric strength | >= 20.0 kV/mm | >= 508 kV/in | in air, extruded; ASTM D149 |
| Thermal Performance | Rating (Metric) | Rating (Imperial) | Test Method |
| Coefficient of Linear Thermal Expansion | 120 - 130 µm/m-°C | 66.7 - 72.2 µin/in-°F | ASTM D696 |
| Maximum operating temperature, Air | 260 °C | 500 °F | |
| Minimum operating temperature, Air | -200 °C | -328 °F |
*Special reminder, if you need this seal product, please provide us with the corresponding drawings so that we can provide you with better help.
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