NCIDQ IDFX Practice Exam

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What is the most resistant fabric to fire when untreated?

Nylon
Cotton
Wool
Rayon

The correct answer is: Wool

Wool is considered the most resistant fabric to fire when untreated due to its inherent properties. It contains a higher moisture content than many other textiles, which helps it resist ignition. Additionally, wool has a natural structure of crimped fibers that allows for better air retention, making it less prone to catching fire and supporting combustion. When subjected to flames, wool tends to smolder rather than ignite and will self-extinguish once the flame source is removed. This behavior makes wool a safer choice in environments where fire resistance is a concern. In contrast, other fabrics, such as nylon, cotton, and rayon, can more readily ignite and burn, especially when untreated. Understanding the fire-resistant properties of various fabrics is crucial for interior design professionals when selecting materials for specific environments, especially in commercial settings where fire safety regulations are stringent.