NCIDQ IDFX Practice Exam

Which synthetic fiber retains high oxygen levels during combustion?

1. Nylon

2. Acrylic

3. Olefin

4. Polyester

The correct answer is: Nylon

Nylon is the correct choice because it is a type of polyamide fiber that retains high oxygen levels during combustion. When nylon burns, it produces a relatively high amount of heat and generates significant smoke due to the high levels of oxygen it retains. This property can make it more hazardous in a fire situation because it can contribute to a more intense burning process. In comparison, fabrics like acrylic, olefin, and polyester have different combustion characteristics. For example, acrylic fibers tend to melt and drip when exposed to flames, leading to further hazards. Olefin is known for having low smoke development and burning rapidly without much heat produced. Polyester, while durable and resistant to wrinkles, does not retain oxygen levels to the same extent as nylon, leading to a different burning behavior and overall combustion profile. Understanding these distinctions is crucial for ensuring safety in interior design, particularly in selecting materials for environments where fire safety is a concern.