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Polystyrene sheets are made from the aromatic monomer called Styrene which is liquid hydrocarbon produced commercially of oil. Polystyrene is solid at the room temperature however, can be melted on heating. The polystyrene sheets are extremely easy to cut and have found a wide use in packaging. The type of polystyrene used in packaging is usually the expanded polystyrene which in turn is made from a mixture of 95% polystyrene and 5% gaseous agents. The other type of polystyrene is the extruded polystyrene which is commonly known as Styrofoam.

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