First U.S. Commercial Sulfur Fiber Production: 1983, Phillips Fibers Corporation, A Subsidiary of Phillips 66 Company
Current U.S. Sulfur Fiber Producers: (Sulfur is not produced in the United States. The only producer is Toray Industries, Inc. Japan)
Federal Trade Commission Definition for Sulfur Fiber: A manufactured fiber in which the fiber-forming substance is a long synthetic polysulfide in which at least 85% of the sulfide (-Sn-) linkages are attached directly to two (2) aromatic rings. (Complete FTC Fiber Rules here.)
Basic Principles of Sulfur Fiber Production — The PPS (polyphenylene sulfide) polymer is formed by reaction of sulfur with dichlorobenzene and then extruded by melt spinning to produce both staple and filament fibers.