What are the differences between
“inherent” and “treated” flame resistant fabrics?
Inherently flame resistant fibers are
materials that have flame resistance built into their chemical structures.
Aramid fibers from companies like DuPont create inherently flame resistant
fibers, with brands such as DuPont™ Kevlar® and DuPont™ Nomex®. The actual
structure of the fiber itself is not flammable. For inherently flame resistant
fibers, the protection is built into the fiber itself and can never be worn
away or washed out. In the case of Nomex®, when exposed to flame, the aramid
fiber swells and becomes thicker, forming a 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.
The other main category is
flame-retardant treated (FRT) fabrics. These materials are made flame-resistant
by the application of flame-retardant chemicals. A chemical additive in the
fiber or treatment on the fabric is used to provide some level of flame
retardancy. During a 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. READ MORE
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