On February 2, the market price of phthalic anhydride in East China showed a weak consolidation. The mainstream quotation for ortho-xylene-based phthalic anhydride was 6,000–6,200 yuan/ton, while the market price for naphthalene-based phthalic anhydride ranged from 5,550 to 5,900 yuan/ton. The price of industrial naphthalene fluctuated and declined, while the price of ortho-xylene remained stable, leading to a decrease in the cost of phthalic anhydride. Downstream plasticizer prices fluctuated and fell, with plasticizer manufacturers maintaining low and stable equipment operating rates. Downstream demand was primarily driven by rigid demand, with phthalic anhydride purchases being need-based. The demand support for phthalic anhydride weakened. Phthalic anhydride manufacturers maintained stable equipment operating rates, ensuring sufficient supply. Phthalic anhydride inventories remained low. It is expected that the future market for phthalic anhydride will continue to experience weak consolidation.