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Seals and O-rings are two different items.

A seal is a stationery used to indicate identification or signature on a document. Generally, a seal is first coated with paint before being printed. If it is not coated with paint and is printed on a flat surface, it will appear concave and convex, which is called a steel seal. Some are wax seals printed on wax or lacquer, or envelopes. The production materials include jade, metal, wood, stone, etc. The seal is one of the representatives of traditional Chinese culture.

O-rings are a type of rubber sealing ring with a circular cross-section. Due to its O-shaped cross-section, they are called O-ring seals, also known as O-rings. The O-ring has excellent sealing performance and a long working life. The working life of dynamic pressure sealing is 5-10 times higher than that of conventional rubber sealing products, with a maximum of tens of times. Under certain conditions, it can have the same lifespan as the sealing substrate. The frictional resistance is small, and the dynamic and static frictional forces are equal, which is 1/2-1/4 of the frictional force of the "0" shaped rubber ring. It can eliminate the "crawling" phenomenon of movement at low speeds and pressures. It also has high wear resistance and good self-lubricating performance. The O-ring structure is simple and easy to install. It is suitable for installation on various mechanical equipment, and plays a sealing role in specified temperature, pressure, and different liquid and gas media under static or moving conditions.

This is the basic information about seals and O-rings. If necessary, you can consult professional books or consult professionals to obtain more useful information.