What is "polydimethylsiloxane"

n. (context chemistry English) The simplest silicone, being a polymer having a repeat unit of -Si(CH₃)₂-O- ; its properties depend on the degree of polymerization and range from that of an oil to a plastic

Polydimethylsiloxane (PDMS) belongs to a group of polymeric organosilicon compounds that are commonly referred to as silicones. PDMS is the most widely used silicon-based organic polymer, and is particularly known for its unusual rheological (or flow) properties. PDMS is optically clear, and, in general, inert, non- toxic, and non- flammable. It is also called dimethicone and is one of several types of silicone oil ( polymerized siloxane). Its applications range from contact lenses and medical devices to elastomers; it is also present in shampoos (as dimethicone makes hair shiny and slippery), food (antifoaming agent), caulking, lubricants, kinetic sand, and heat-resistant tiles.