Widely used as an extreme pressure (EP) and anti-wear additive in lubricants, particularly in greases, gear oils, and metalworking fluids. It enhances the performance of lubricants under high-load and high-temperature conditions by forming a protective film on metal surfaces, reducing friction and preventing wear and scuffing. Commonly found in automotive and industrial applications where reliable lubrication is critical under heavy stress. Also used in some solid lubricant formulations and as a sulfur donor in specialized chemical processes, including organic synthesis.