What is a key characteristic of a mechanical seal?

A mechanical seal is designed primarily to prevent leakage between rotating and stationary components, often in applications such as pumps and compressors. The ability to effectively seal and prevent environmental contamination or fluid loss is crucial for the efficiency and safety of the system. Therefore, the statement that a mechanical seal should never leak captures the fundamental purpose of its design.

While minimizing friction, having high tensile strength, and operating at high temperatures are important characteristics for mechanical seals, they serve secondary roles in the context of what makes a seal effective. The primary goal is to maintain a tight seal under operational conditions, and any leakage can lead to performance issues, contamination, and environmental concerns. Thus, a mechanical seal's essential function is its ability to prevent leaks, highlighting why this characteristic is so significant.