聚酯产业链：传统旺季，等待需求恢复

1. Report Industry Investment Rating No relevant content provided. 2. Core Viewpoints of the Report - The polyester industry chain is in the traditional peak season, waiting for demand recovery. Overall, due to the supply - increase and demand - decrease situation in the upstream raw materials and the complex supply - demand relationship within the industry chain, the prices of various products in the polyester industry chain are expected to show an oscillatory downward trend, but there are differences among different products [6][17][52][98][144]. 3. Summary by Related Catalogs 3.1 Polyester Industry Chain Market Review - In August 2025, the polyester industry chain prices fluctuated within a range under the influence of market sentiment and costs. The price center of gravity first declined and then rebounded, and finally oscillated and declined at the end of the month [6]. 3.2 Crude Oil - In August 2025, the crude oil price first declined and then rebounded under the influence of geopolitics and supply - demand, with the price center of gravity moving downward. In September, OPEC+ will further increase production, and the demand will turn from peak to off - peak. Overall, the oil price is expected to oscillate downward [10][17]. 3.3 PX - In August 2025, PX supply increased, and the rigid demand weakened marginally. The price oscillated widely under the influence of costs and news. In September, it is expected that the supply - demand structure will remain relatively tight, and the PXN spread will oscillate strongly in the range of 250 - 300 US dollars/ton, while the absolute price is expected to oscillate weakly under the drive of costs [21][52]. 3.4 PTA - In August 2025, PTA processing fees were low, the start - up rate decreased, and the price oscillated with costs. In September, it is expected that the supply will decrease and the demand will increase, and the inventory will continue to decline slightly. The processing fees are expected to oscillate and rise, but the absolute price may oscillate downward under the guidance of costs [54][98]. 3.5 Ethylene Glycol - In August 2025, the start - up rate of ethylene glycol increased, and the inventory remained at a low level. The price oscillated with costs. In September, it is expected that the supply and demand will both increase, the de - stocking speed will slow down, and the price will be supported by low inventory, but the cost and macro - factors will still play a leading role in the price trend [102][144]. 3.6 Polyester Staple Fiber - In August 2025, the start - up rate of polyester staple fiber increased, the downstream demand improved marginally, and the price fluctuated with costs. In general, the supply and demand both increased [146].