O-rings are a common seal used in a variety of hydraulic and pneumatic systems, as well as other industrial and automotive applications. The material selection of O-rings is related to their performance in different environments and applications. The following is a detailed distinction between some common O-ring materials and their uses:
Nitrile rubber (NBR):
Purpose: NBR O-rings are common in general industrial applications and suitable for many liquid sealing applications, especially oils and oil-based liquids.
Features: It has good oil resistance, wear resistance, and low cost, but has poor resistance to high temperatures and strong acid and alkali environments.
Fluorine rubber (FKM):
Purpose: FKM O-rings are suitable for use in high-temperature, high-pressure, and highly corrosive environments, such as in the chemical industry and aerospace applications.
Features: Excellent high-temperature resistance, oil resistance, and chemical resistance, but relatively high cost.
Polytetrafluoroethylene (PTFE):
Purpose: PTFE O-rings are suitable for high-temperature, chemically corrosive environments, and occasions requiring extremely low friction.
Features: It has excellent high-temperature and chemical corrosion resistance, but may become more fragile in some low-temperature environments.
Silicone rubber (VMQ):
Purpose: Silicone rubber O-rings are often used in high-temperature environments, such as hot water systems, engine parts, etc.
Features: Excellent high-temperature resistance and aging resistance, but relatively low elasticity and wear resistance.
Polyurethane (PU):
Purpose: PU O-rings are usually used in high-pressure hydraulic systems that require wear-resistant and high-pressure-resistant seals.
Features: It has good wear resistance, oil resistance, and elasticity, and is suitable for some applications requiring high-performance sealing.
When selecting O-ring materials, factors such as the medium, temperature, pressure, and working environment must be considered. Carefully weighing these factors and selecting the appropriate O-ring material can ensure long-term reliable operation of the sealing system.
