On February 6, the phthalic anhydride market in Shandong region exhibited a weak consolidation trend. The mainstream negotiation price for phthalic anhydride produced via the ortho-xylene method ranged between 6,000 and 6,200 yuan per ton, while the price for phthalic anhydride produced via the naphthalene method ranged between 5,550 and 5,900 yuan per ton. The price of raw material ortho-xylene remained stable, while the price of industrial naphthalene fluctuated and declined, leading to a reduction in the production cost of phthalic anhydride. Downstream plasticizer prices also experienced a fluctuating decline. Phthalic anhydride production facilities maintained stable operations, with the operating rate of phthalic anhydride enterprises remaining low but stable. The supply of phthalic anhydride in the market tightened, while the operating load of plasticizer enterprises remained temporarily stable. The demand-side support for phthalic anhydride weakened, and the market outlook for phthalic anhydride is expected to continue its weak consolidation trend.