1,4-Butanediol, a colorless viscous liquid, is a versatile chemical used in polymers, solvents, and pharmaceuticals. It?s a precursor for polyurethanes and spandex fibers. In pharma, it?s an intermediate for APIs. It?s also a solvent in coatings and a humectant in cosmetics. Its high purity ensures quality. Keywords: 1,4-butanediol, polyurethane precursor, pharmaceutical solvent, spandex chemical, cosmetic humectant.