Inherently Flame-retarded (IFR)
These fabrics have been milled from modified synthetic staple fibres and
yarns and do not need additional treatment to
achieve the indices required. Fabrics that are classed as inherently
flame-retardant are permanently flame retarded and retardance is unaffected by
wetting. Most IFR fabrics are dimensionally stable and may be carefully laundered
(depending upon curtain construction).
Durably Flame-retarded (DFR)
These fabrics are chemically treated, normally at the time the fabric is being
finished. Flame retardancy is permanent and fabrics may be wetted without
effecting retardancy, however dry cleaning is generally recommended for such
fabrics to minimise the risk of shrinkage.
Non Durably Flame-retarded (NDFR)
These fabrics are chemically treated with a water soluble solution. All
fabrics classed as NDFR will withstand at least 5 water free dry cleaning cycles
without effecting retardancy. If fabrics are wetted in
any way, it is essential to retreat the fabric to meet flammability
requirements. Retreatment may also be required after multiple cleanings or after a period
of use in a high humidity environment.
Not Flame-retardant (Not FR)
These fabrics are not flame-retarded.
Most untreated natural, synthetic and blended fabrics can be flame retarded.
Many natural and some synthetic fabrics, once treated, will meet BCA
requirements for retardancy. Generally, the chemicals used are water soluble.