Phenylacetylene (also known as Ethynylbenzene) is an alkyne hydrocarbon bonded to a benzene ring. Supplied by Actylis, it is a viscous, uncolored liquid that is both flammable and hygroscopic, meaning it absorbs moisture. As a member of the benzene family, Phenylacetylene is commonly used in the pharmaceutical industry as a substitute for acetylene gas, due to its ease of handling. It serves as a pharmaceutical intermediate and is often employed in the production of styrene through reduction with Lindlar's Catalyst. Styrene is a key chemical in the production of widely used polymers such as polystyrene and synthetic rubbers.