1.Phthalic anhydride minangka salah sawijining bahan mentah kimia organik sing paling penting, turunan utamane yaiku dibutyl phthalate, dioctyl ester lan diisobutyl ester, lan bisa digunakake minangka plasticizer kanggo PVC, lsp.
2. Bisa uga digunakake ing produksi resin poliester tak jenuh, resin alkyd, pewarna lan pigmen, macem-macem cat, aditif panganan, lsp.