PTFE Piston Seal
| Property | Unit | Test Method | Test Parameter | Value |
| Hardness | Shore D | ASTM D2240 | (Shore D - 15 sec) | 59 |
| Specific Gravity | g/cm3 | ASTM D792 | 2.16 | |
| Tensile Strength | MPa | ASTM D638 | Microtensile specimen of ASTM D1708, speed of testing 0.8mm/s |
27 |
| Ultimate Elongation | % | ASTM D638 | Microtensile specimen of ASTM D1708, speed of testing 0.8mm/s |
300 |
| Modulus of Elasticity | MPa | ASTM D638 | 280 | |
| Coefficient of thermal expansion from 25 to 100°C |
°C-1 | ASTM E 831 | 16x10-5 | |
| Dielectric Strength(short time test) | kV/mm | ASTM D149 | 35 |
Introduction
A PTFE piston seal is a seal used between the piston rod and the cylinder, usually made of PTFE material.
Piston seals can be used at high temperatures, and their long-term use temperature can reach 260 °C. At high temperatures, its mechanical properties and chemical stability are very good.
The friction coefficient of the seal is very low, which can reduce the friction between the seal and the moving parts, thus improving the mechanical efficiency and service life.
Sealing principle
1. Surface tension effect: The surface tension of the PTFE piston seal forms a closed liquid film, preventing the medium from directly contacting the sealing surface. This membrane effectively prevents media penetration and leakage.
2. Geometric design of the sealing surface: The geometric design of the sealing surface of the PTFE seal is also one of the important factors in its sealing performance. Typically, circular, conical, rectangular, trapezoidal, and other geometric shapes are used to design to increase sealing performance.
Application Scenarios
1. Chemical industry: In chemical production, PTFE piston seals can be used for sealing in various corrosive media and high-temperature environments, such as acids, alkalis, salts, and other chemical substances and high-temperature steam.
2. Pharmaceutical industry: In pharmaceutical production, piston seals can be used for the transportation and sealing of various drugs, such as injections, tablets, solvents, etc., and their hygiene and safety have been widely recognized.
3. Food industry: In food production, piston seals can be used for packaging and sealing various foods, such as beverages, dairy products, meat, etc., and their hygiene and safety have been widely recognized.
4. Machinery industry: In machinery manufacturing, Teflon piston seals can be used for sealing various mechanical equipment, such as pumps, compressors, valves, etc. Its high-temperature resistance, corrosion resistance, and low friction coefficient can improve the performance of the equipment.
5. Automobile industry: In automobile manufacturing, rubber piston seals can be used for sealing engines, hydraulic systems, and other parts, such as piston rings, oil seals, etc. Its high-temperature resistance, corrosion resistance, and low friction coefficient can improve the performance of the car.
Certification
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