The flammability of fabric can be drastically
reduced through the use of fire retardants.
Many natural fibers, including cotton, can
be topically treated with a chemical that
reduces the fabric's flammability to the
extent that it becomes nearly non-combustible.
During a fire, the chemical reacts with
the gases and tars generated naturally by
the fabric, converting the gases and tars
char, thus drastically slowing the fabric's
Some polyester fabrics are considered
permanently fire retardant. This is because
fire retardant properties are built directly
into the molecular structure of the fibers.
Fabrics manufactured utilizing Trevira and
Avora polyester fibers are considered inherently
or permanently fire retardant. Other synthetic
fabrics may be considered durably fire retardant,
fire retardant, or non-fire retardant.
Durably fire retardant refers to
a process in which polyesters are chemically
treated during the manufacturing process
with a non-water soluble chemical. In other
cases, synthetic fabrics may be topically
treated with chemicals after the manufacturing
process (in the same manner as natural fibers
such as cotton), or may be untreated (or
untreatable) and therefore considered non-fire
Twaron is used in modern fabrics to
withstand high temperatures in industry