Which fiber is known to be flame retardant?

Wool is recognized for its natural flame-resistant properties. This characteristic is primarily due to its chemical composition and different structural characteristics. When exposed to flames, wool tends to char rather than ignite, which slows down the spread of fire and allows for a safer environment. The fibers contain a high amount of moisture which also helps reduce flammability. This inherent flame retardancy makes wool an ideal choice for upholstery and other textiles used in interiors, particularly in settings where safety is a concern.

Cotton, while being a commonly used fiber, is highly flammable and does not possess natural flame-resistant qualities. Synthetic fibers can be engineered to be flame retardant, but not all synthetic materials have this property inherently. Linen, on the other hand, is similar to cotton in its susceptibility to fire, making it less favorable in applications requiring flame resistance. Therefore, among the options, wool stands out for its ability to provide a degree of protection against fire hazards.