Used as a chain extender and coupling agent in polymer chemistry, particularly in the synthesis of specialty polyurethanes. Its structure contains two hydroxyl groups connected by a flexible chain with ether and thioether linkages, enabling the formation of polymers with enhanced flexibility, mechanical properties, and chemical resistance. Commonly applied in coatings, adhesives, and sealants requiring improved performance in demanding environments. The thioether groups contribute to stability and specific optical properties in the final materials.