Synthetic Fibers:

There are 2 types of synthetic fiber products:
1. Semisynthetics, or cellulosics (viscose rayon, and cellulose acetate)
2. True Synthetics or noncellulosics (polyester, nylon, acrylic, modacrylic, and plyolefin).

These 6 fiber types compose over 99 percent of the total production of manmade fibers in the U.s.

Semisynthetics are formed from natural polymeric materials such as cellulose. True synthetics are products of the polymerization of smaller chemical units into long-chain molecular polymers. Fibers are formed by forcing a viscous fluid or solution of the polymer through the small holes of a spinnerette and immediately solidifying or precipitating the resulting filaments. This prepared polymer may also be used in the manufacture of other nonfiber products such as the enormous number of extruded plastic and synthetic rubber products.

Synthetic Fibers Include:
Rayon
Acetate
Nylon
Modacrylic
Olefin
Acrylic
Polyester
Carbon Fiber
Vinyon
Saran
Spandex
Vinalon
Aramids (AKA Nomex, Kevlar, Twaron)
Modal
Dyneema/Spectra
PBI
Sulfar
Lyocell
PLA
M-5
Orlon
Zylon
Vectran
Acrylonitrile Rubber
Glass Fiber
Metalic Fiber

REFERENCES:
http://www.epa.gov/ttn/chief/ap42/ch06/final/c06s09.pdf
www.wholeearth.com