2-Butoxyethanol-d9 is an intermediate in the synthesis of Tris(2-butyloxyethyl)phosphate-d27 (T875032), which is the isotope analog of Tris(2-butyloxyethyl)phosphate. Tris(2-butyloxyethyl)phosphate,is an organophosphate, that can be used in the preparation of flame retardant, such as viscose fiber.