Polyvinyl methyl siloxane (PVMS) fluid is a type of silicone fluid that incorporates vinyl and methyl groups into its molecular structure. It is a versatile material known for its flexibility, low viscosity, and excellent thermal stability. 

PVMS fluids are often used as release agents, lubricants, and in various industrial applications where their chemical inertness, resistance to oxidation, and water repellency are beneficial. They are also used in personal care products, healthcare applications (such as dental impression materials), and as additives in coatings and adhesives due to their unique properties.