Some of the uses of polystyrene are:A polymeric substance Styrene in its solid form is used in packaging.Food containers made of styrene are rigid.Medical and optical instruments are constructed out of polymeric styrene.Styrene is used to make electronic devices, children's toys, kitchen appliances, household objects, and a variety of other things.Polystyrene foam is a low-density foam. As a result, it can be used in foodservice packaging as a protective layer.Polystyrene is used to make a variety of construction materials, including insulation.Fiber-reinforced polymer composites are manufactured of styrene and are known as fiber-reinforced polymer composites (FRP). These components are used in the manufacture of car parts.