Oregon Construction Contractors (CCB) Practice Test

What naturally occurring mineral fiber is known for strength and resistance to heat and corrosion in building materials?

1. Fiberglass

2. Asbestos

3. Silica

4. Rock wool

The correct answer is: Asbestos

Asbestos is a naturally occurring mineral fiber that has historically been valued for its exceptional strength and resistance to heat and corrosion. Its unique properties made it a popular choice in a variety of building materials, including insulation, roofing, and floor tiles. Asbestos fibers can withstand high temperatures and are highly durable, which contributed to their widespread use in construction. Despite these beneficial characteristics, it is important to note that asbestos poses significant health risks, including respiratory diseases and cancers when inhaled. This has led to strict regulations and a decline in its use in many countries, including the United States. Due to the hazardous nature of asbestos, alternative materials are now often favored in construction, although understanding its historical importance and properties is crucial for those studying construction regulations and safety practices. In contrast, fiberglass is a synthetic material that is lightweight and used primarily for insulation but lacks the same heat resistance as asbestos. Silica, while a common mineral found in materials like glass and concrete, does not possess the same fibrous properties or heat resistance. Rock wool, produced from natural stone, serves as an insulation material but is not as effective as asbestos in certain applications regarding heat resistance and fiber strength.