▁b ags ▁and ▁linear ▁low - dens ity ▁poly eth yl ene ▁( LL D PE ) ▁as ▁stretch ▁wrap ▁in ▁transport ing ▁and ▁handling ▁boxes ▁of ▁dur able ▁goods , ▁and ▁as ▁the ▁common ▁household ▁food ▁covering . ▁ ▁Poly phen yl ene ▁ox ide ▁Poly phen yl ene ▁ox ide ▁( P PO ), ▁which ▁is ▁obtained ▁from ▁the ▁free - rad ical , ▁step - g row th ▁ox id ative ▁coupling ▁polym er ization ▁of ▁ 2 , 6 - xy len ol , ▁has ▁many ▁attract ive ▁properties ▁such ▁as ▁high ▁heat ▁dist ort ion ▁and ▁impact ▁strength , ▁chemical ▁stability ▁to ▁min eral ▁and ▁organ ic ▁ac ids , ▁and ▁low ▁water ▁absor ption . ▁P PO ▁is ▁difficult ▁to ▁process , ▁and ▁hence ▁the ▁commercial ▁res in ▁( N ory l ) ▁is ▁made ▁by ▁bl ending ▁P PO ▁with ▁high - imp act ▁pol yst y rene ▁( H IP S ), ▁which ▁serves ▁to ▁reduce ▁the ▁processing ▁temperature . ▁ ▁Poly phen yl ene ▁sul f ide ▁Poly phen yl ene ▁sul f ide ▁( P PS ) ▁obtained ▁by ▁the ▁cond ens ation ▁polym er ization ▁of ▁p - d ich lor ob enz ene ▁and ▁sod ium ▁sul f ide , ▁has ▁out standing ▁chemical ▁resistance , ▁good ▁elect rical ▁properties , ▁excellent ▁fl ame ▁ret ard ance , ▁low ▁coefficient ▁of ▁fr iction ▁and ▁high ▁trans par ency ▁to ▁mic row ave ▁radiation . ▁P PS ▁is ▁princip ally ▁used ▁in