Changshu Polyester Filament Market Shows Structural Divergence: Commodity Grades Stabilize, High-Denier Varieties Face Downward Pressure

In the final week of June 2026, trading in the Changshu polyester filament market remained subdued, but prices showed hidden currents. A price list released on the 28th revealed that FDY 100D/48F (from Xinfengming and Tiansheng Chemical Fiber) and key DTY grades such as 75D/36F, 100D/36F, and 150D/144F all dropped by 100 yuan/ton, while FDY 68D, 75D, and DTY 150D/48F held steady. This structural divergence is not simply a case of 'can't rise' or 'can't fall'—it is a clear signal of refined adjustments in downstream weaving demand.

Background: Weak Polyester Feedstocks Weigh on Market Sentiment

The core contradiction facing the polyester filament market remains insufficient cost support. Prices for polyester feedstocks PTA and MEG have been weak recently, directly compressing margins for filament producers and undermining their ability to support prices. The softening of FDY 100D in Changshu is not an isolated case—the same fine-denier, high-filament-count DTY 75D/36F (from Taicang draw-texturing mills) also dropped 100 yuan to 10,200 yuan/ton, suggesting that inventory pressure in the draw-texturing segment is beginning to be transmitted upstream to filament yarn.

Notably, FDY 68D/24F (Rongsheng Petrochemical, Tongkun Group) and 75D/36F (Xiaoshan Shuangtu, Xinfengming) both maintained their prices at 9,200 yuan/ton and 9,000 yuan/ton, respectively, indicating that demand from weaving mills for this 'golden weight' range remains relatively rigid. Meanwhile, FDY 150D/36F (Tiansheng Petrochemical at 8,400 yuan/ton) and DTY 150D/96F (Hengyi Chemical, Shaoxing Yuandong at 9,300 yuan/ton) have remained flat for two consecutive weeks, showing a fragile equilibrium between supply and demand for conventional water-jet loom varieties.

Industry Impact: How Structural Divergence Reshapes Procurement Logic

This pattern of 'commodity grades stabilizing, high-denier varieties weakening' carries multiple implications for the upstream and downstream supply chain:

• **For weaving mills**: The simultaneous decline in FDY 100D and DTY 100D will directly benefit factories producing lightweight fabrics such as pongee and taffeta, potentially reducing their raw material costs by about 1%. However, the price drop in DTY 75D/36F (to 10,200 yuan/ton) warrants caution—this specification is commonly used in imitation silk fabrics. If downstream orders do not recover in tandem, the price cut may be just the beginning of a destocking cycle.
• **For draw-texturing mills**: The decline of DTY 150D/144F (Xinfengming) from 9,400 to 9,300 yuan/ton suggests that the premium for high-filament-count, low-intermingle products is narrowing. Texturing mills need to reassess their POY purchasing pace to avoid falling into negative profit processing due to falling finished product prices.
• **For polyester plants**: The entire range of FDY 75D bright yarn (from Zhangjiagang, Jiangsu Huaya, Rongsheng, Jiabao) is quoted at 8,700 yuan/ton, a level maintained for at least a week. This reflects the strong rigid demand for bright filament yarn in the luggage and lining sectors, making it difficult to substitute in the short term.

Regionally, as an important polyester filament distribution hub in Jiangsu, Changshu's price movements serve as a bellwether for neighboring weaving clusters like Shengze and Nantong. The current price decline in the 100D category is likely to spread to other markets in early July, pulling down prices for similar specifications.

Practical Recommendations

For Buyers - If you have near-term procurement plans for FDY 100D or DTY 75D/36F, it is advisable to wait until early July for prices to stabilize before building positions in batches, to avoid catching a falling knife. - For commodity grades like FDY 68D and 75D, current prices are near three-month lows. Consider increasing safety stock to 15-20 days to lock in current costs. - Monitor PTA futures; if PX prices break below previous lows, polyester filament may see another round of catch-down declines, which could open a window for concentrated purchasing.

For Mills (Weaving/Draw-Texturing) - Draw-texturing mills should prioritize destocking existing DTY 75D/36F and 150D/144F inventory and suspend new POY purchases until POY prices also adjust downward correspondingly. - Weaving mills, when quoting for orders, should incorporate polyester filament price volatility into their terms and consider signing 'raw material-linked price' contracts with customers to transfer cost risk. - Pay close attention to volume changes in the 100D category: if inventory declines for two consecutive weeks, the current price drop may be the last; if inventory continues to accumulate, prices could test the 8,500 yuan/ton range by mid-July.