Trimethylthiourea is primarily used as an accelerator in the vulcanization process of rubber, enhancing the speed and efficiency of the curing process. It is particularly effective in producing rubber products with improved mechanical properties, such as increased tensile strength and elasticity. Additionally, it finds application in the synthesis of certain pharmaceuticals and agrochemicals, where it acts as an intermediate in the production of active ingredients. Its role in organic synthesis also extends to the preparation of various sulfur-containing compounds, which are valuable in industrial and research settings.