Poly two methyl siloxane (English: POLYDIMETHYLSILOXANE,PDMS) is a polymer silicone compound, usually called silicone. With optical transparency, and under normal circumstances, is considered inert, non-toxic, non-flammable. Poly two methyl siloxane (PDMS) is the most widely used silicone based organic polymer material, which is used in micro-flow systems, filler, lubricants, contact lenses in bio-MEMS.