Seals refer to materials used to fill, seal, or isolate gaps between objects to prevent the leakage or entry of liquids, gases, or solids. The following are some types related to seals:

1. O-ring: A type of annular seal, usually made of rubber or elastic material, used to provide sealing effect in static or dynamic sealing applications.

2. Gasket: A flat sealing element, usually made of rubber, metal, or fiber materials, used to fill the gap between two connecting components to ensure sealing performance.

3. Pressure seal: A seal used at the connection of high-pressure vessels or pipelines, capable of withstanding the sealing requirements in high-pressure environments.

4. Expansion joint: A sealing element used to absorb thermal expansion, contraction, or vibration, usually made of rubber, metal, or synthetic materials, used in systems such as pipelines and containers.

5. Oil seal: A seal used to prevent the flow of lubricating oil or other liquids, usually used in rotating bearings or mechanical equipment.

6. Sealing strip: A strip shaped seal used to fill the gap between two connecting components and provide a sealing effect, usually made of rubber or plastic.

7. Thread seal: A sealing element used to prevent leakage at threaded connections, usually using thread sealant or thread gasket to achieve sealing effect.

8. Magnetic seal: A sealing element that utilizes the principle of magnetic force to achieve sealing effect, commonly used for sealing requirements in high temperature, high pressure, or special environments.

These types cover some common types and application scenarios of seals. The specific selection of sealing components should be determined based on specific needs, working environment, and application requirements. For more information, please consult Dongheng Sealing Parts Co., Ltd.