Asbestos is described as which of the following?

• A. A naturally occurring mineral fiber used for insulation that is not fire resistant.
• B. A synthetic polymer used in insulation.
• C. A naturally occurring material widely used because it is fire resistant.
• D. A metal alloy used in structural members.

Answer: (C)

Asbestos is a naturally occurring mineral fiber. This form gives it unique properties that made it highly valued for insulation and fireproofing: it resists heat and doesn’t burn easily, so it can protect structures and equipment from high temperatures. That combination—natural origin, fibrous structure, and strong fire resistance—explains why it was widely used in insulation. It isn’t a synthetic polymer or a metal alloy, so descriptions that label it as plastic or metal don’t fit. Keep in mind that, despite its historic usefulness, inhaling asbestos fibers is dangerous, which is why its use is now heavily regulated in many places.