What is the difference between inherently flame-resistant fabrics and chemically dependent flame-retardant fabrics?
Nomex® Protective Apparel is inherently flame resistant. The actual structure of the fiber itself is not flammable, which means the protection is permanent. The protection is built into the fiber itself and can never be worn away or washed out. When exposed to flame, the aramid fiber swells and becomes thicker, forming protective barrier between the heat source and the skin. This protective barrier stays supple until it cools, giving the wearer vital extra seconds of protection to escape. Chemically dependent flame-retardant fabrics, such as Indura® flame-retardant treated cotton, FireWear®, Flamex® and FR rayon, provide a different type of protection. A chemical additive in the fiber or treatment on the fabric is used to provide some level of flame retardancy. During a flash fire, chemically dependent fabrics rely on a chemical reaction to extinguish the flame. This reaction is triggered by the heat of the fire and the amount of time the fabric is exposed to the fire. As the time and
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