The material selection of the sealing ring is crucial in extremely low temperature environments. The sealing ring not only needs to maintain its elasticity and sealing performance, but also needs to have resistance to hardening and embrittlement caused by low temperatures. This article will explore in detail the sealing ring materials suitable for use in a low-temperature environment of -55 ° C.

1. Perfluoroelastomer (FFKM)

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characteristic:

• Chemical stability: Perfluororubber has excellent chemical resistance and can resist the erosion of various chemicals.

• Temperature resistance: able to maintain good performance at high temperatures (up to 300 ° C) and low temperatures (as low as -55 ° C).

• Mechanical performance: maintains excellent elasticity and resistance to compression deformation at extreme temperatures.

• Aging resistance: excellent aging resistance and long service life.

Application:

Aerospace: Used for rocket engines and aircraft seals.

Chemical industry: equipment used for processing strong acids, strong bases, and other corrosive chemicals.

Petroleum industry: used for sealing oil wells and pipelines under high temperature and pressure.

2. Nitrile rubber (NBR)

characteristic:

Oil resistance: It has excellent oil and fuel resistance performance.

Wear resistance: It has good wear resistance and is suitable for situations with high dynamic stress.

Low temperature performance: It may become hard and brittle at low temperatures, but its low-temperature flexibility can be improved by adding plasticizers.

Application:

Automotive industry: seals used for engines and transmission systems.

Hydraulic system: used for hydraulic seals that require oil resistance and wear resistance.

3. Hydrogenated Nitrile Rubber (HNBR)

characteristic:

• Temperature resistance: significantly improved heat and cold resistance, able to maintain good flexibility and elasticity at low temperatures of -55 ° C.

• Chemical resistance: It has better chemical resistance than ordinary nitrile rubber.

Mechanical performance: Excellent performance under high dynamic stress, strong resistance to compression deformation.

Application:

Industrial transmission system: used for transmission seals that require high heat and cold resistance.

Refrigeration equipment: used for sealing components in low-temperature environments.

4. Silicone rubber (VMQ, Silicone)

characteristic:

• High and low temperature resistance: Maintain good performance within the temperature range of -60 ° C to 200 ° C.

• Mechanical performance: Has good elasticity, but relatively weak in chemical and oil resistance.

• Biocompatibility: It has good biocompatibility and is suitable for medical devices.

Application:

Food processing: used as seals for food processing equipment and packaging machines.

Medical equipment: Used for medical devices and instruments that require biocompatibility.

5. Polytetrafluoroethylene (PTFE, Teflon)

characteristic:

• Chemical resistance: It has excellent chemical resistance and can resist the erosion of various chemical substances.

• Temperature resistance: Maintain good performance within the temperature range of -200 ° C to 260 ° C.

Non elastic material: It is a type of non elastic material commonly used for static sealing, but its mechanical properties can be improved by adding fillers such as glass fiber and carbon fiber.

Application:

Chemical industry: equipment used for processing strong acids, strong bases, and other corrosive chemicals.

Semiconductor industry: used for sealing components in high-temperature and chemically corrosive environments.

6. Fluorosilicone rubber (FVMQ)

characteristic:

Oil resistance: It is a fluorinated modified product of silicone rubber, which improves oil and chemical resistance.

• Temperature resistance: Maintain good performance within the temperature range of -60 ° C to 200 ° C.

• Mechanical performance: Maintain good flexibility and elasticity at low temperatures.

Application:

Automotive industry: seals used for engines and transmission systems.

Aviation industry: used for aviation equipment that requires oil resistance and high/low temperature resistance.

7. Polyurethane rubber (AU/EU)

characteristic:

Wear resistance: It has 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 formula adjustments.

Mechanical performance: Excellent performance under high dynamic stress, strong resistance to compression deformation.

Application:

Industrial transmission system: used for transmission seals that require wear and oil resistance.

Hydraulic equipment: used for hydraulic seals in low-temperature environments.

conclusion

Choosing the appropriate sealing ring material is key to ensuring system reliability and performance in a low-temperature environment of -55 ° C. Perfluororubber, hydrogenated nitrile rubber, silicone rubber, polytetrafluoroethylene, fluorosilicone rubber, and polyurethane rubber are all potential choices, and the specific selection depends on the application environment, chemical resistance, oil resistance, and dynamic performance requirements. It is recommended to consult professional seal manufacturers or suppliers when selecting materials to ensure that the selected materials can meet practical application needs. Through scientific selection and rational design, the performance and service life of sealing rings in low-temperature environments can be effectively improved, ensuring the stable operation of the system.