What is a key characteristic of a compression joint?

A key characteristic of a compression joint is that it is typically made from materials such as brass, which is known for its durability, conductivity, and resistance to corrosion. Brass is frequently chosen for compression fittings because it can create a tight seal without the need for additional sealing materials, ensuring a reliable connection. This makes it particularly useful in plumbing and certain electrical applications where a strong connection is essential.

Compression joints rely on the physical compression of the fitting around a pipe or wire, resulting in a secure connection that can handle various pressures. The design of compression joints ensures that they can maintain their integrity even under shifting loads or environmental conditions. Other materials can also be utilized for compression joints, but brass is a common choice due to its excellent properties.

The other options presented do not accurately describe the primary characteristics of compression joints. For example, compression joints do not require heat to form, they can be used in various applications beyond just electrical connections, and they are indeed often pressure rated to withstand specific limits, contrary to the implication in one of the choices.