On July 3, 2026, Rongsheng Petrochemical (including Shengyuan) lowered spot prices for several polyester FDY specifications by 100-200 yuan/ton. Key grades such as bright FDY 30D/24F were quoted at 10,950 yuan/ton, 75D/36F at 8,500 yuan/ton, 150D/96F at 8,300 yuan/ton, 200D/48F at 8,450 yuan/ton, 200D/96F at 8,400 yuan/ton, and 300D/96F at 8,400 yuan/ton. This price adjustment quickly dampened sentiment across the polyester sector, creating bearish pressure on both polyester filament yarn and staple fiber.
Background: Overcapacity Meets Weak Demand
This price cut is not an isolated move. Industry data shows that polyester filament yarn capacity continued to expand in the first half of 2026, while downstream weaving mills operated at only 65%-70% utilization. The supply-demand gap has widened consistently. As a leading polyester producer, Rongsheng's pricing actions often signal broader market trends. The 100-200 yuan/ton reduction, though modest in magnitude, carries strong signaling power—indicating that upstream inventory pressure has finally forced pricing adjustments.
Notably, the cuts focused on fine and medium-denier FDY grades, particularly 75D/36F and 150D/96F, which are the main raw materials for water-jet looms. Reducing prices on these two grades directly lowers fabric makers' input costs, yet end-use fabric orders remain lackluster. In clusters like Shengze and Changxing, grey fabric inventories have climbed to over 45 days, and mills are adopting a hand-to-mouth procurement strategy, unwilling to build stocks.
Industrial Impact: A Cascade of Bearish Signals
The impact of FDY price cuts ripples through the polyester chain in three layers. First, spot market negotiation centers shift downward, with a bearish score of -1 (moderate negative). This means traders holding high-cost inventories face impairment risks and may accelerate selling, further depressing prices.
Second, futures markets are affected. Polyester FDY is strongly correlated with PTA and MEG futures. Spot price declines will pressure these related contracts, especially PTA, which already has limited price elasticity amid high polyester operating rates. This cut could accelerate PTA's downward trend.
Third, the bearish sentiment spills over to polyester staple fiber (PSF). Although PSF and FDY are different subcategories, both belong to the polyester fiber family. Industry data shows PSF also faces overcapacity, with operating rates around 80%, but downstream spinning mills are cautious in procurement. The FDY cut indirectly pressures PSF, giving it a bearish score of -0.5.
From a profit chain perspective, upstream PX and PTA margins remain acceptable, but polyester production has entered a thin-margin or even loss-making zone. Rongsheng's price cut essentially transfers upstream profits downstream in an attempt to stimulate demand. However, feedback from weaving mills suggests this transfer has not effectively translated into order growth; instead, it has reinforced wait-and-see attitudes.