Red Seal Insulator (Heat and Frost) Practice Exam

Which of the following materials is commonly used for thermal insulation?

1. Concrete

2. Fiberglass

3. Steel

4. Brick

The correct answer is: Fiberglass

Fiberglass is widely recognized for its effectiveness as a thermal insulation material, primarily due to its unique properties. It is composed of fine glass fibers that create small air pockets, which significantly reduce heat transfer through conduction, convection, and radiation. This makes fiberglass notably effective at maintaining temperature, whether in buildings or equipment, leading to energy efficiency and improved comfort. Its lightweight nature also allows for easier installation compared to heavier materials, and it can be produced in various forms, such as batts, rolls, and loose-fill, enabling versatility in application across different settings. Moreover, fiberglass resists moisture and does not support combustion, making it a safe and durable option for thermal insulation purposes. In contrast, materials like concrete, steel, and brick are generally used for structural purposes and have much higher thermal conductivity, making them less suitable as insulators on their own. While they can play a role in thermal mass or structural integrity, they do not effectively inhibit heat flow like fiberglass does.