Within just two days, mainstream polyester filament yarn quotations in the Changshu market moved up by 100 to 300 yuan per ton, with the price increase spanning from semi-dull FDY to bright trilobal FDY and the full DTY range. Yet trading volume did not expand in tandem. That combination sends a more important signal than the magnitude of the increase itself: costs are pushing, but demand is not pulling.
Divergent Gains Across Specifications
According to industry public data comparing quotations from September 8 to 10, the bright trilobal FDY series posted the most prominent gains. The 50D/24F bright specification from Rongsheng Chemical rose to 10,450 yuan per ton, while the 50D/36F bright from Jiabao New Fiber reached 10,400 yuan per ton. Multiple origins of 75D/36F bright converged in the 10,050 to 10,100 yuan per ton range, with two-day increases of 200 to 300 yuan per ton.
On the semi-dull FDY side, the 68D/24F specification from both Rongsheng Petrochemical and Tongkun Group was raised by 200 yuan per ton, reaching 10,250 and 10,200 yuan per ton respectively. The 100D/48F from Tongxiang Xinfengming and Tiansheng Chemical also climbed 200 yuan per ton, entering the 9,800 to 9,850 yuan per ton band. Xiaoshan Shuangtu's 75D/36F rose by only 100 yuan per ton, the smallest increase among semi-dull FDY items.
DTY followed suit but with more moderate adjustments. Rongsheng Petrochemical's 150D/144F fixed-weight specification rose 300 yuan per ton to 10,700 yuan per ton, the largest gain in the DTY segment. Mainstream DTY specifications from Taicang texturing mills, Xiaoshan Kaishi, Xinfengming, Hengyi Chemical Fiber, and Shaoxing Yuandong mostly increased by 200 yuan per ton. Notably, Zhejiang Yuandong's 200D/96F fixed-weight specification held flat at 10,250 yuan per ton, the only item in the entire quotation table that did not adjust.
Cost Push Versus Weak Demand
The primary driver behind this rally comes from the polyester raw material side. Industry public information indicates that polyester raw material prices have surged recently, directly raising the production cost baseline for filament yarn. For mills, rising raw material costs mean that even if processing fees remain unchanged, ex-factory prices must be passively raised, otherwise margins would invert.
The problem is that sales volume has not kept pace with prices. While quotations were raised, market trading volume remained lackluster, suggesting that downstream weaving and texturing procurement interest was not activated by the price hike. On the contrary, buyers may hold back further as prices climb. This price-up-volume-flat combination typically signals cost-push rather than demand-pull inflation in the chemical fiber supply chain.
For buyers, this means the sustainability of current quotations depends on whether the raw material side can maintain its strength. If polyester raw material prices continue to rise, filament yarn quotations still have room to move higher. Once the raw material side softens, quotations lacking volume support will face downward pressure.
What Regional Quotation Divergence Reveals
From an origin perspective, this round of price adjustments shows clear regional divergence. Leading enterprises such as Tongkun, Xinfengming, Hengyi, and Rongsheng moved in relatively consistent steps, with mainstream specification increases uniformly around 200 yuan per ton, reflecting strong coordination among large polyester plants in cost transmission.
By contrast, smaller origins and texturing enterprises such as Taicang texturing mills, Xiaoshan Kaishi, and Shaoxing Yuandong adjusted more cautiously. Zhejiang Yuandong's decision to hold its 200D/96F specification unchanged may relate to its inventory structure, order scheduling, or customer price-lock agreements. This divergence has practical reference value for buyers: during an upcycle, the timing lag and magnitude differences across origins are precisely the operational window for price comparison and locking.
The fact that bright trilobal FDY gains significantly outpaced semi-dull FDY also deserves attention. Bright trilobal products are mostly used in specialty-style fabrics and differentiated textiles, where downstream demand is relatively concentrated and supply-side bargaining power is stronger. This makes it easier to achieve larger price increases when costs rise.