Diphenyl methylphosphonate is primarily used as a flame retardant in various polymer systems, including plastics and resins, to enhance their fire resistance properties. It is also employed as a plasticizer to improve the flexibility and durability of polymeric materials. In the field of organic synthesis, it serves as a key intermediate for the production of other phosphorus-containing compounds. Additionally, it finds application in the development of specialty chemicals and coatings, where its flame-retardant characteristics are highly valued. Its use in the electronics industry is notable for protecting components from fire hazards.