On February 6, the market price of phthalic anhydride in Jiangsu region fluctuated downward. The mainstream negotiation price for ortho-xylene-based products was between 6,000 and 6,200 RMB/ton, while that for naphthalene-based products ranged from 5,550 to 5,900 RMB/ton. Phthalic anhydride manufacturers maintained stable equipment operation, with the operating rate remaining low and steady. The domestic phthalic anhydride market had ample spot supply, while the price of raw material ortho-xylene stabilized. The price of industrial naphthalene fluctuated downward, weakening the cost support for phthalic anhydride. The downstream plasticizer market also experienced a downward fluctuation, with plasticizer enterprises maintaining stable operating loads, resulting in reduced demand support for phthalic anhydride. Downstream industries made purchases based on rigid demand, and the phthalic anhydride market is expected to remain weak and consolidate in the near future.