Kumashishini amaninzi, zimbini izinto eziphambili ezichaphazela iindlela zexabiso. Inye yeyona nto iphambili i-upstream yohlaza, kwaye enye i-dowwream ye-terminali. Kukwanjalo nangomzi mveliso we-resin ongekho phantsi.
Njengoko kuchaziwe ngaphambili, i-resin engadibaniyo kufuneka ikwazi ukusabela nge-polysterstation kunye ne-polycondetions, kunye ne-vinyl monomers zongezwa njengomgangatho ngokobushushu. Ke ngoko, ezona zinto zintathu ziphambili zeStyrene, i-anhydride, kwaye i-proplelene i-Glycol ibalulekile. I-Bellwether yoMvelisi we-Wiren ogcweleyo ukuba ihlengahlengise amaxabiso. Ukuba amaxabiso ezinto ezintathu eziphambili eziphakamayo ngamanqanaba, ixabiso lentengiso lale nto liya kulandela isuti, ngokunyuka okulandelelana, kunye ne-vice.
Ukongeza kwintengiso yempahla engafunekiyo, ukuguquguquka kwimarike yemfuno kunye notshintsho kwimeko ye-MACRO yenye yezona zinto zibalulekileyo ezichaphazela intengo yentengiso yezi zinto.
