On February 6, 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 downward, while the price of ortho-xylene remained stable, leading to a decline in the production cost of phthalic anhydride. Downstream plasticizer prices fluctuated downward, with plasticizer manufacturers maintaining low and stable equipment operating rates. Downstream demand was primarily driven by rigid demand, with phthalic anhydride procurement being need-based. The demand support for phthalic anhydride weakened. Phthalic anhydride manufacturers maintained stable equipment operating rates, ensuring sufficient supply, while inventory levels remained low. It is expected that the phthalic anhydride market will continue to experience weak consolidation in the near future.