In extremely low temperature environments, the material choice of the sealing ring is crucial. The sealing ring not only needs to maintain its elasticity and sealing performance, but also needs to be resistant to hardening and embrittlement problems caused by low temperatures. This article will discuss in detail the sealing ring material suitable for use in the low temperature environment of -55°C.
1.Nitrile butadiene rubber (NBR)
Features:
Oil resistance: Excellent oil resistance and fuel resistance.
Wear resistance: Good wear resistance, suitable for high dynamic stress occasions.
Low temperature performance: It may become hard and brittle at low temperatures, but its low temperature flexibility can be improved by adding plasticizers.
Applications:
Automotive industry: Seals for engines and drivetrains.
Hydraulic system: For hydraulic seals requiring oil and wear resistance.
2. Hydrogenated nitrile butadiene rubber (HNBR)
Features:
Temperature resistance: significantly improved heat and cold resistance, able to maintain good flexibility and elasticity at low temperatures of -55°C.
Chemical resistance: Better chemical resistance than ordinary nitrile rubber.
Mechanical properties: Excellent performance under high dynamic stress, strong compressive deformation resistance.
Applications:
Industrial transmission systems: For transmission seals requiring high heat and cold resistance.
Refrigeration equipment: seals for low temperature environments.
3. Silicone rubber (VMQ, Silicone)
Features:
High and low temperature resistance: Good performance in the temperature range from -60°C to 200°C.
Mechanical properties: Good elasticity, but relatively weak in chemical resistance and oil resistance.
Biocompatibility: Has good biocompatibility, suitable for medical devices.
Applications:
Food processing: Seals for food processing equipment and packaging machines.
Medical devices: For medical devices and instruments that require biocompatibility.
4. Polyteflon (PTFE, Teflon)
Features:
Chemical resistance: It has excellent chemical resistance and can resist the erosion of various chemical substances.
Temperature resistance: Good performance in the temperature range from -200°C to 260°C.
Non-elastomer: is a non-elastomer, often used for static sealing, but can improve its mechanical properties by adding fillers (such as glass fiber, carbon fiber).
Applications:
Chemical: Equipment for handling strong acids, alkalis and other corrosive chemicals.
Semiconductor industry: Used for seals in high temperature and chemical corrosive environments.
5. Fluorosilicone rubber (FVMQ)
Features:
Oil resistance: It is a fluorinated modified product of silicone rubber, which improves oil resistance and chemical resistance.
Temperature resistance: Good performance in the temperature range from -60°C to 200°C.
Mechanical properties: Maintain good flexibility and elasticity at low temperatures.
Applications:
Automotive industry: Seals for engines and drivetrains.
Aviation industry: Used for aviation equipment requiring oil resistance and high and low temperature resistance.
6. Polyurethane rubber (AU/EU)
Features:
Wear resistance: Excellent wear resistance and oil resistance.
Low temperature performance: It may become hard and brittle at extremely low temperatures, but its low temperature performance can be improved by proper formula adjustment.
Mechanical properties: Excellent performance under high dynamic stress, strong compressive deformation resistance.
Applications:
Industrial transmission systems: For transmission seals that require wear and oil resistance.
Hydraulic equipment: Hydraulic seals for low temperature environments.
conclusion
In low-temperature environments of -55°C, selecting the right seal material is the key to ensuring system reliability and performance. Hydrogenated nitrile butadiene rubber, silicone rubber, polytetrafluoroethylene, fluorosilicone rubber and polyurethane rubber are all potential options, depending on the application environment, chemical resistance, oil resistance and dynamic performance requirements. It is recommended to consult a professional seal manufacturer or supplier when selecting materials to ensure that the material selected can meet the needs of the actual application. Through scientific selection and reasonable design, the performance and service life of the sealing ring in low temperature environment can be effectively improved to ensure the stable operation of the system.