Polystyrene Resin CAS No. 9003-53-6, the molecular formula is C8H8, mainly used for foaming molding, heat insulation, shockproof, packaging materials and floating products. General Purpose Type (R) is suitable for packaging materials; flame retardant type (F) is suitable for building and thermal insulation materials. It is mainly used for manufacturing audio-visual products and optical disk boxes, lamps and interior decoration, high-frequency electrical insulation parts and other physical properties, colorless, odorless, tasteless and shiny transparent solid. It is soluble in aromatic hydrocarbon, chlorinated hydrocarbon, aliphatic ketone and Ester and so on.