Pentachlorothiophenol is primarily used as a chemical intermediate in the production of rubber chemicals, particularly in the vulcanization process of synthetic rubbers. It acts as a peptizing agent, which helps in reducing the viscosity of rubber compounds, making them easier to process and mold. This chemical is also employed in the manufacture of certain types of adhesives and sealants, where it enhances the bonding properties and durability of the final product. Additionally, it finds application in the synthesis of agricultural chemicals, where it serves as a building block for creating pesticides and herbicides. Its role in these industries is crucial for improving the efficiency and performance of various materials and products.