Which of the following is a component of a lantern ring?

• A. Sealing material
• B. Ring clamp
• C. Threaded bolt
• D. Piston

Answer: (A)

A lantern ring is an important component of a mechanical seal used in various types of equipment, particularly in pumps and mixers. It serves a dual function as part of the sealing system. The sealing material is critical as it provides the primary surface that contacts the shaft and prevents leakage of the fluid being contained.

In many cases, the lantern ring is designed to incorporate a specific sealing material that can withstand the fluid's chemical properties and the operational conditions like temperature and pressure. This material can be a form of elastomer, PTFE, or other specialized compounds that facilitate effective sealing.

The other options such as the ring clamp, threaded bolt, and piston do play roles in securing or creating motion within machines, but they do not define the structure or main functionality of a lantern ring. This emphasis on sealing material showcases why it is essential for containment integrity, making it a fundamental component within the system designed to prevent leaks.