▁co ating ▁applications . ▁This ▁is ▁done ▁by ▁sp ray ing ▁an ▁a que ous ▁sl ur ry ▁of ▁P PS ▁particles ▁and ▁he ating ▁to ▁temper atures ▁above ▁ 3 7 0   ° C . ▁Part icular ▁gr ades ▁of ▁P PS ▁can ▁be ▁used ▁in ▁injection ▁and ▁compression ▁m old ing ▁at ▁temper atures ▁( 3 0 0 ▁to ▁ 3 7 0   ° C ) ▁at ▁which ▁P PS ▁particles ▁soft en ▁and ▁under go ▁apparent ▁cross link ing . ▁Princi pal ▁applications ▁of ▁injection ▁and ▁compression ▁m old ed ▁P PS ▁include ▁cook ware , ▁bear ings , ▁and ▁p ump ▁parts ▁for ▁service ▁in ▁various ▁cor ros ive ▁environments . ▁ ▁Poly pro py l ene ▁Poly pro py l ene ▁( PP ) ▁is ▁useful ▁for ▁such ▁diverse ▁products ▁as ▁re usable ▁pl astic ▁food ▁containers , ▁mic row ave - ▁and ▁d ish w ash er - safe ▁pl astic ▁containers , ▁dia per ▁l ining , ▁san it ary ▁pad ▁l ining ▁and ▁cas ing , ▁ro pes , ▁car p ets , ▁pl astic ▁m old ings , ▁pip ing ▁systems , ▁car ▁batter ies , ▁ins ulation ▁for ▁elect rical ▁c ables ▁and ▁filters ▁for ▁g ases ▁and ▁liqu ids . ▁In ▁medicine , ▁it ▁is ▁used ▁in ▁h ern ia ▁treatment ▁and ▁to ▁make ▁heat - res istant ▁medical ▁equipment . ▁Poly pro py l ene ▁sheets ▁are ▁used ▁for ▁station ery ▁folders ▁and ▁pack aging ▁and ▁clear ▁storage ▁b