Uses:

 In the determination of tungsten and sulfates and in the preparation of azo dyes, cross-linking agent for epoxy resins, in the preparation of isocyanates and polyisocyanates, in the rubber industry, as a curative for neoprene, as a anti-frosting agent (anti- oxidant) in footwear and raw material in preparation of poly(amide-imide) resins (used in magnet wire enamels). Curing agent for epoxy resins and urethane elastomers. As corrosion inhibitor. Rubber additive (accelerator, antidegradant, retarder) in tires and heavy rubber products. Also used in adhesives and glues, laminates, paints and inks, PVC products, handbags, eyeglass frames, plastic jewelry, electric encapsulators, surface coatings, spandex clothing, hairnets, eyelash curlers, earphones, balls, shoe soles, face masks. 
May produce erythema multiforme like eruptions.