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