In this guide FR will designate materials that are
inherently flame-resistant, such as NOMEX® and
KEVLAR®. FRT will designate materials that have been
treated with a flame-retardant chemical to make them
flame resistant, such as FRT cotton.
Since its introduction, the product lines of NOMEX®
have been augmented to include a variety of natural and
colored fibers and blends, each with unique properties
designed to meet specific end-use requirements. The
general classes of these products are discussed in the
following section. Table I-1 on page 4 lists some specific
commercial products and their end uses.