Which of the following materials is commonly used in fireproofing applications?

Concrete is commonly used in fireproofing applications primarily due to its inherent properties that enhance fire resistance. One of the main reasons concrete is preferred is its ability to withstand high temperatures without losing structural integrity. This makes it an effective barrier to fire, protecting both the structural elements and the contents of a building.

Additionally, concrete has a low thermal conductivity, which helps to slow down the transfer of heat, thereby contributing to fire protection. Its composition, which often includes aggregates, cement, and water, results in a material that does not burn or produce harmful smoke when exposed to flames.

In contrast, the other materials listed do not possess the same fire-resistant characteristics. Wood can ignite and burn easily; plastic typically melts and can release toxic fumes when exposed to high temperatures; and glass, although it can endure some heat, may shatter or become weak with extreme thermal exposure. Hence, concrete stands out as a reliable choice for fireproofing in construction and building defense against fires.