Diphenyl guanidine is widely used as an accelerator in the vulcanization of rubber, enhancing the speed and efficiency of the process. It is particularly effective in improving the mechanical properties of rubber products, such as tensile strength and elasticity. Additionally, it is employed in the production of tires, conveyor belts, and other industrial rubber goods, where it ensures durability and resistance to wear. In the pharmaceutical industry, it serves as an intermediate in the synthesis of various drugs. It is also utilized in the manufacture of adhesives and sealants, contributing to their bonding strength and stability. Furthermore, diphenyl guanidine finds application in the production of specialty chemicals, where it acts as a catalyst or stabilizer in specific reactions.