On June 10, the phthalic anhydride market in Jiangsu experienced weak consolidation. The mainstream negotiation price for o-xylene method feedstock ranged from 8,450 to 8,750 RMB/ton, while that for naphthalene method feedstock ranged from 7,550 to 7,900 RMB/ton. Phthalic anhydride plant operating rates remained at a high level with stable utilization. The domestic phthalic anhydride market saw ample supply. Crude oil prices fell from their highs, raw material ortho-xylene prices declined, and industrial naphthalene prices fluctuated downward, leading to reduced costs for phthalic anhydride. Downstream plasticizer prices dropped, and the operating rates of plasticizer plants rebounded from low levels, still providing some support for phthalic anhydride demand. Downstream customers purchased on a need-to basis. The phthalic anhydride market under the o-xylene method exhibited weak consolidation.