Which fiber is known for being naturally fire and flame resistant?

Wool is known for its natural fire and flame resistance, which sets it apart from many other fibers. This characteristic arises from its unique structure and chemical composition. The keratin present in wool, a protein, contains sulfur that contributes to its flame-retardant properties. Additionally, wool has a high moisture content, which means it tends to smolder rather than ignite, providing an added layer of protection against flames.

When subjected to fire, wool tends to form a protective char rather than burning rapidly, allowing it to extinguish itself once the heat source is removed. This makes it an excellent choice for applications where safety from fire is a concern, such as in carpets and upholstery.

In contrast, other fibers such as acrylic, cotton, and nylon have varying levels of compatibility with fire. Cotton is flammable and can ignite easily, while nylon may melt when exposed to high heat. Acrylic has a similar reaction to nylon, making these fibers less suitable in contexts where fire resistance is crucial. Therefore, wool stands out as the fiber with the best inherent resistance to fire.