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2 Answers. 1  Rayon is made from plant cellulose, but that cellulose has been rendered and reduced into it's basic chemical form. Rayon is a synthetically made fiber from those naturally occurring plant materials. 2  It's a regenerated fiber. Regenerated fibers are made by processing natural fiber materials.
Rayon is the generic term for fiber (and the resulting yarn and fabric) manufactured of regenerated cellulose by any one of six processes. Its importance as a fiber lies in its versatility, and in the fact that it was the first viable manufactured fiber. Absorbency: Rayon is the most absorbent of all cellulose fibers, even more so than cotton and linen. 2  Because of this, rayon absorbs perspiration and allows it to evaporate away from the skin, making it an excellent summer fabric. 3  Its high absorbency applies equally to dyes, allowing beautiful, deep, rich colours.