n A manufactured fiber composed of regenerated cellulose, as well as manufactured fibers composed of regenerated cellulose in which substituents have replaced not more than 15% of the hydrogens of the hydroxyl groups (FTC definition). Rayon fibers include yarns and fibers made by the viscose process, the cuprammonium process, and the now obsolete nitrocellulose and saponified acetate processes. Generally, in the manufacture of rayon, cellulose derived from wood pulp, cotton linters, or other vegetable matter is dissolved into a viscose spinning solution. The solution is extruded into an acid–salt coagulating bath and drawn into continuous filaments. Groups of these filaments may be made in the form of yarns or cut into staple. CHARACTERISTICS: Rayon yarns are made in a wide range of types in regard to size, physical characteristics, strength, elongation, luster, handle, suppleness, etc. They may be white or solution dyed. Strength is regulated by the process itself and the structure of the yarn (Also see Polynosic Fiber). Luster is reduced by including delustering materials, such as titanium dioxide pigments, in the fiber when it is extruded. The suppleness of the yarn is controlled by the number of filaments in the yarn, the denier or gauge of the individual filaments or fibers, and the fiber cross-section. END USES: Rayon is used in draperies, bedspreads, upholstery, blanket, dish towels, curtains, throw rugs, tire cord, industrial products, sport shirts, slacks, suitings, dress goods, and linings and in blends with other fibers to enhance functional and aesthetic qualities, e.g., with polyester in permanent-press fabrics.