I-1.I-anhydride ye-Phthalic ingenye yezinto ezibaluleke kakhulu zezinto eziphilayo zamakhemikhali ephilayo, okuphuma kwayo okuyinhloko yi-dibutyl phthalate, i-dioctyl ester ne-diisobutyl ester, futhi ingasetshenziswa njenge-plasticizer ye-PVC, njll.
I-2.Ingasetshenziswa futhi ekukhiqizeni i-polyester resin engasetshenzisiwe, i-alkyd resin, odayi nezingulube, izinhlobonhlobo zamapende, izithasiselo zokudla, njll.