PTFE oil seal (polytetrafluoroethylene oil seal) is a high performance seal, widely used in modern industry. This paper will introduce the basic knowledge of PTFE oil seal, including material characteristics, structure and working principle, performance advantages and application fields.
First, material characteristics
1. Chemical stability
PTFE oil seals have excellent chemical stability and can resist the erosion of almost all chemicals, including strong acids, strong bases and strong oxidants. This allows the PTFE oil seal to work in harsh environments.
2. Thermal stability
PTFE oil seals operate at a wide temperature range and can maintain excellent performance at extreme temperatures from -200 ° C to +300 ° C. The pyrolysis temperature is higher than 400℃, and it has good thermal stability.
3. Low friction coefficient
Teflon has an extremely low coefficient of friction (only 0.02), which is much lower than traditional rubber materials. Low friction features help reduce energy loss and extend equipment life.
4. Self-lubricity
The surface of the PTFE material has superior self-lubricating properties and hardly adheres to any viscous substances, ensuring smooth operation and greatly reducing wear.
Second, structure and working principle
1. Structure composition
PTFE oil seal is mainly composed of sealing lip, skeleton and guide ring and other parts, lips made of polytetrafluoroethylene material, flared shape, the height is generally between 4-6mm.
2. How it works
The sealing lip of the oil seal relies on the memory contraction ability of the material, shrinks due to friction heat during work, and is tightly fitted to the surface of the shaft to achieve effective sealing. It is designed so that the oil seal can self-regulate in the rotation of the shaft and enhance the sealing effect.
Third, performance advantage
1. Wear resistance
Through modification, the wear resistance of PTFE oil seal can be significantly improved, and its application ability in high wear environment can be enhanced.
2. High sealing
PTFE oil seals can withstand pressures of up to 1.0MPa (single lip) and 3MPa (double lip), sealing performance far exceeds that of traditional rubber oil seals, suitable for demanding sealing applications.
3. No leakage
Thanks to its unique design and material properties, PTFE oil seals enable leak-free operation, which is especially important in demanding industrial applications.
4. Application field
PTFE oil seals are widely used in many industries:
Chemicals and pharmaceuticals: Used in chemical reactors and delivery systems.
Automotive industry: Used in engines, transmissions and steering systems.
Aerospace: Used in high temperature and high pressure environments.
Food processing: Ensure food safety and hygiene standards.
conclusion
PTFE oil seals are ideal for many industrial applications due to their excellent chemical and physical properties. Understanding the basics of PTFE oil seals can help users make more informed decisions when choosing and using them.
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