Polystyrene - PS The most common application of PS is as expanded PS, which is mixture of about 5% PS and 95% air. This polymer also used as insulator in building structures. Moreover, regarding its low cost, clarity, dimensional stability and low density, PS has many attractive features to use in medical applications. No. Grade Producer Applications More Details 1 GPPS 1240 Tabriz Petrochemical Special Extrution & Injection Molding , Impact Dilution TDS 2 HS 121 Tabriz Petrochemical Low Density Foam Block TDS 3 HS 221 Tabriz Petrochemical Medium Density Block TDS 4 HS 321 Tabriz Petrochemical High Density Block TDS 5 WP 526 Tabriz Petrochemical Shape Molding , Drinking Cups TDS 6 HIPS 6630 Tabriz Petrochemical Computer Keyboards , Toys , Spools TDS 7 WT 1235 Tabriz Petrochemical Toys , TV Cabinets , Clocks TDS 8 HIPS 7240 Tabriz Petrochemical Darty Sheets , Cups , Trays , Egg Boxes , General Packing TDS 9 HIPS 7240 WB Tabriz Petrochemical Derty Sheets , Cups , Trays , Egg Boxes , General Packing TDS