Comparison between PTF oil seal and traditional oil seal
In modern industry, oil seal is an important component to ensure the normal operation of mechanical equipment and prevent leakage. Conventional oil seals are generally made of rubber or polyurethane materials, while PTFE oil seals are made of polytetrafluoroethylene (PTFE) materials. This paper will compare the differences of these two types of oil seals in material characteristics, performance advantages, service life and application fields.
First, material characteristics
1. Chemical stability
PTFE oil seal: With excellent chemical stability, it can resist the erosion of almost all chemicals, including strong acids, strong bases and strong oxidants, so it is suitable for harsh chemical environments.
Conventional oil seals: Rubber oil seals are sensitive to certain chemicals (such as solvents and oils) and may be dissolved or deteriorated, limiting their scope of use.
2. Temperature range
PTFE oil seal: can work in the extreme temperature range of -200 ° C to +300 ° C, excellent thermal stability.
Traditional oil seal: usually can only work between -40 ° C and +120 ° C, which is greatly affected by temperature changes.
Second, performance advantage
1. Friction performance
PTFE oil seal: The friction coefficient is extremely low, usually 0.02, which can significantly reduce energy loss, reduce operating costs, and enhance equipment efficiency.
Traditional oil seal: The coefficient of friction is high, and the heat brought by friction will cause the sealing performance to decline and accelerate wear.
2. Service life
PTFE oil seal: Because of its strong wear resistance, significantly longer service life, suitable for high frequency, high pressure application scenarios.
Traditional oil seal: relatively short service life, especially in harsh working environments, prone to aging, hardening or leakage.
Three, sealing performance
1. Oily
PTFE oil seal: Due to its low friction properties, PTFE oil seals are able to maintain good sealing performance without additional lubrication.
Traditional oil seal: usually rely on a high lubricating oil film to maintain the sealing effect, if insufficient lubrication is prone to leakage.
2. Pressure resistance
PTFE oil seal: withstand up to 1.0MPa (single lip) to 3MPa (double lip) pressure, sealing performance is superior.
Traditional oil seal: usually under low pressure, only suitable for general mechanical seal needs.
4. Application field
1. Application of PTFE oil seal
Industry: air compressor, gear box, pump and other high temperature and high pressure equipment.
Chemical: Used in chemical reaction equipment and treatment equipment, with high corrosion resistance.
Food: In line with food safety standards, widely used in food processing industry.
2. Application of traditional oil seal
Automotive: Used in engines, transmissions and other relatively mild environments.
Household appliances: Used for sealing common electrical appliances and small machines.
conclusion
In general, PTFE oil seals are better than traditional oil seals in terms of chemical stability, temperature resistance, friction performance and service life, and are suitable for more demanding working environments. However, traditional oil seals still perform well in many common applications, and the cost is low, so when selecting oil seals, it is necessary to make reasonable choices according to the specific application needs. Understanding the characteristics and applicable scenarios of the two helps users make informed decisions.
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