38. Before it was recognized as a health hazard, asbestos was commonly used as insulation in residential and commercial construction because it is:
Answer: A
Asbestos was commonly used as insulation because it is fire resistant.
Asbestos gained popularity in construction due to its excellent fire-resistant properties, making it an effective material for insulation in both residential and commercial buildings.
A) fire resistant.
This option is correct as asbestos is well-known for its ability to withstand high temperatures and resist fire, which made it a sought-after material for insulation purposes before its health risks were fully understood.
B) water resistant.
While asbestos does have some water-resistant qualities, this is not the primary reason it was used as insulation. Water resistance does not significantly contribute to its effectiveness in thermal insulation compared to its fire-resistant properties.
C) an air purifier.
This option is incorrect as asbestos does not purify air. In fact, inhalation of asbestos fibers can lead to serious health issues, including lung diseases, which contradicts the notion of it being beneficial for air quality.
D) repellent to common pests.
Asbestos does not possess pest-repellent properties. Its use as insulation was primarily based on its thermal and fire-resistant qualities, not its ability to deter pests.
Conclusion
The primary reason for asbestos's widespread use in insulation was its fire resistance, which provided safety benefits in construction. Other options either misrepresent its properties or are unrelated to its function in this context, reinforcing that A is the definitive correct choice.