Poly(methylhydrosiloxane) (PMHS) is used as a crosslinking agent in silicone curing systems, particularly in RTV (room temperature vulcanizing) silicones, providing enhanced durability, flexibility, and moisture/thermal stability in sealants, adhesives, and coatings for automotive, construction, and electronics applications.

It is a key reagent in hydrosilylation reactions, enabling the formation of silicon-carbon bonds for synthesizing advanced chemicals in pharmaceuticals, electronics, and biomaterials.

Additionally, PMHS acts as a surface modifier to improve water repellency in textiles and paper, and as an additive in personal care formulations for a smooth, non-greasy feel. It can also contribute to viscosity control and flow properties in coatings and inks.