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O-ring seals can be classified into the following types based on their materials and applications:

Rubber O-ring: Made of rubber material, it has good heat resistance, oil resistance, acid and alkali resistance, and is widely used in fields such as machinery, automobiles, and ships. It can also be divided into fixed sealing O-ring, reciprocating sealing O-ring, and rotary sealing O-ring according to their purpose.

Polyurethane O-ring: Made of polyurethane, it has excellent wear resistance and corrosion resistance, suitable for sealing in high-speed rotation, high pressure, and high temperature environments.

PTFE O-ring: Made of PTFE, it has excellent corrosion resistance and high temperature resistance, and is suitable for fields such as chemical, medical, and food.

Metal O-ring: Mainly made of metal materials, it has characteristics such as high pressure, high temperature, and corrosion resistance, and is suitable for fields such as petroleum, natural gas, and nuclear industry.

The above are several common types of O-ring seals, and their specific uses and performance may vary according to actual usage scenarios.