The Proban treatment process involves several specific steps and is only available to carefully selected licensees. Proban itself is a low molecular weight, polymeric chemical that is impregnated into the fabric. The fabric is then dried to a specific moisture content before being cured by exposure to high-concentration ammonia gas. Next it is oxidized with hydrogen peroxide, washed, dried again and finally softened with a polyethylene textile softener.
Flame-retardancy is achieved by the formation of a cross-linked inert polymer within the fibre. Because the polymer is inert, it leaves the base fabric unaffected and because it is insoluble it cannot be washed out (except by incorrect laundering.) When exposed to heat, the flame retardant breaks down to form an acid in the fabric which masks the cellulose of the cotton and catalyses char formation. The carbon is then coated by potassium preventing oxidation. Essentially when Proban treated fabric is exposed to flame it forms a localised char that acts as an insulating layer.
You can also choose YSETEX FR treatment fabric to protective your body!