Nonmetal sulfides — including carbon disulfide, hydrogen sulfide (in solution), and commercial phosphorus trisulfide (P₄S₃) — serve specialized roles as chemical intermediates, flotation reagents in mining, and match-head and pyrotechnic compositions. Phosphorus trisulfide is the defining commercial product in this group, used primarily in the manufacture of safety matches and certain lubricant additives. Carbon disulfide, a widely traded solvent and intermediate for viscose rayon and carbon tetrachloride production, is subject to EPA TSCA certification and carries significant flammability and toxicity hazard classifications under DOT rules. The dual-use potential of certain phosphorus sulfides in pyrotechnic applications may warrant end-use screening by importers.

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