In extremely low temperature environments, the material selection of the sealing ring is crucial. The sealing ring not only needs to maintain its elasticity and sealing performance, but also needs to resist the hardening and embrittlement problems caused by low temperature. This article will discuss in detail the sealing ring materials suitable for use in low temperature environments of -55°C.
1. Nitrile rubber (NBR)
Features:
Oil resistance: Excellent oil resistance and fuel resistance.
Wear resistance: It has good wear resistance and is suitable for occasions with high dynamic stress.
Low Temperature Properties: May become hard and brittle at low temperatures, but its low temperature flexibility can be improved by adding plasticizers.
application:
Automotive industry: seals for engines and transmission systems.
Hydraulic system: used for hydraulic seals that require oil resistance and wear resistance.
2. Hydrogenated nitrile rubber (HNBR)
Features:
Temperature resistance: Significantly improved heat resistance 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 and strong resistance to compression deformation.
application:
Industrial transmission systems: For transmission seals requiring high heat and cold resistance.
Refrigeration equipment: seals used in low temperature environments.
3. Silicone rubber (VMQ, Silicone)
Features:
High and low temperature resistance: Maintains good performance in the temperature range of -60°C to 200°C.
Mechanical properties: Good elasticity, but relatively weak in chemical and oil resistance.
Biocompatibility: It has good biocompatibility and is suitable for medical equipment.
application:
Food Processing: Seals for food processing equipment and packaging machines.
Medical Devices: For use in medical devices and instruments requiring biocompatibility.
4. Polytetrafluoroethylene (PTFE, Teflon)
Features:
Chemical resistance: It has excellent chemical resistance and can resist the erosion of various chemical substances.
Temperature resistance: Maintains good performance in the temperature range of -200°C to 260°C.
Non-elastomer: It is a non-elastomer that is often used for static sealing, but its mechanical properties can be improved by adding fillers (such as glass fiber, carbon fiber).
application:
Chemical Industry: Equipment used to handle strong acids, alkalis, and other corrosive chemicals.
Semiconductor industry: For seals in high temperature and chemically 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: Maintains good performance in the temperature range of -60°C to 200°C.
Mechanical properties: Maintains good flexibility and elasticity at low temperatures.
application:
Automotive industry: seals for engines and transmission systems.
Aviation industry: used in aviation equipment that requires 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 through appropriate formulation adjustments.
Mechanical Properties: Excellent performance under high dynamic stress and strong resistance to compression deformation.
application:
Industrial transmission systems: For transmission seals that require wear and oil resistance.
Hydraulic equipment: Hydraulic seals used in low temperature environments.
in conclusion
In an environment as low as -55°C, choosing the right seal material is key to ensuring system reliability and performance. Hydrogenated nitrile rubber, silicone rubber, polytetrafluoroethylene, fluorosilicone rubber and polyurethane rubber are all potential choices, 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 selected material can meet the actual application needs. Through scientific selection and reasonable design, the performance and service life of sealing rings in low temperature environments can be effectively improved and the stable operation of the system can be ensured.
Post time: Nov-18-2024