A seal, more precisely known as a mechanical seal, is a device which helps to join systems or mechanisms together by preventing leakage, containing pressure, and preventing contamination. Seals are used in a variety of different ways. For example, seals hold pipes together to prevent water from leaking. It is important to note that there are numerous different kinds of seals, such as spring energized seals and peek seals, and the type of seal that you need will depend on what you are using the seal for.
If you need a seal to function is very extreme conditions, such as under high pressure or in an environment with very volatile temperatures, you will want to specifically look into high pressure seals and high temperature seals. For example, high temperature oil seals are often used in the oil industry, when oil needs to be transported. If you need a seal to withstand high pressure, you need to look into high pressure seals. High pressure seals are typically used in a variety of different industries involving high pressure. Overall, you will want to do a bit of research to find the seal best suited to your needs.