The polyester filament yarn market saw a clear price softening in early July 2026. Industry leader Rongsheng Petrochemical (including Shengyuan) implemented localized price cuts on several DTY specifications, ranging from 100 to 200 yuan per ton. This move is not an isolated event but the result of accumulated contradictions between sustained upstream capacity release and weak downstream purchasing sentiment.
Price Adjustment Details and Direct Signals
According to public quotes, Rongsheng's DTY 75/36 low-elastic was reported at 10,050 yuan/ton, down 100 yuan from the previous period; DTY 150/48 low-elastic was at 9,150 yuan/ton, with a reduction of nearly 200 yuan. The 300D specifications also saw declines of around 100 yuan. While these adjustments fall within the normal daily fluctuation range for polyester filament, considering Rongsheng's capacity scale—accounting for over 15% of domestic polyester filament supply—this price move carries clear bellwether significance for the industry.
More notably, the timing of the price adjustment falls in early July, typically a transitional window between the traditional low and peak seasons in textiles. In past years, weaving companies would begin stocking up for autumn/winter fabrics at this time, but this year's end-user order initiation has been notably slow, forcing polyester plants to accumulate inventory and resort to price cuts to move goods.
Supply-Demand Imbalance is the Root Cause
The core contradiction behind the price adjustment lies in a mismatch between supply and demand. On the supply side, new polyester filament capacity continued to be released in 2025-2026, especially from integrated projects by leading companies, pushing supply growth by over 8% year-on-year. On the demand side, operating rates in downstream weaving and texturing sectors have been declining since June, with sample loom operating rates in Jiangsu and Zhejiang regions falling to around 65%, 5 percentage points lower than the same period last year.
Weakness in both domestic and foreign trade orders is the main driver of demand softness. The domestic market is affected by a slowdown in real estate and infrastructure, reducing demand for home textiles and industrial fabrics. On the export front, European and American retailers are still in a destocking phase, with purchases of polyester fabrics limited to small, just-in-time orders, lacking concentrated bulk demand. This 'supply increase, demand decrease' pattern directly compresses the bargaining space for polyester filament.
Price Transmission: Emotional Resonance from Filament to Staple Fiber
The price softening in polyester filament quickly transmitted to the entire polyester sector. On July 2, 2026, the main 2609 contract for polyester staple fiber on the Zhengzhou Commodity Exchange fell by 136 yuan/ton in a single day, with a noticeable increase in short positions. Although staple fiber and filament have different downstream applications—staple fiber is mainly used for spinning and nonwovens, while filament is for weaving—they share the same raw material cost base of PTA and MEG, and production capacity is concentrated among the same group of chemical fiber giants.
When filament prices dropped, the market's pessimistic expectations for the overall polyester supply-demand structure were reinforced. The decline in staple fiber futures was more an emotional resonance effect. From an industry perspective, staple fiber's own supply-demand situation is better than filament's—its inventory levels are relatively controllable—but the linkage effect in the futures market can inversely affect spot quotes, creating a risk of short-term overshooting.
Implications for Downstream Procurement Strategies
For weaving companies and traders, Rongsheng's price adjustment presents both pressure and opportunity. The pressure lies in the possibility that if end-user orders remain insufficient, polyester filament prices may fall further, causing inventory depreciation for those who have already stocked up. The opportunity is that the current price correction may create a window for centralized procurement for autumn/winter orders.
The key indicator to watch is the inventory days of polyester plants. The industry average inventory has now risen to 18-20 days, approaching the warning line. Once inventory exceeds 25 days, more factories may follow with price cuts or even production cuts. At that point, polyester filament prices could face a new round of decline, but this also means procurement risks and opportunities coexist.