Polyester Filament Price Easing: Signals from Rongsheng Petrochemical's Price Cut

The polyester filament yarn market has seen its first notable softening in the second half of 2026. On July 6, leading producer Rongsheng Petrochemical (including Shengyuan) reduced quotes for selected specifications by 100-200 yuan per ton. Semi-dull POY 75/36 was quoted at 8,100 yuan/ton, 100/96 at 8,100 yuan/ton, 150/48 at 7,800 yuan/ton, and 300/96 at 7,850 yuan/ton. This move broke nearly a month of price stalemate, directly widening bargaining room in the spot market.

Cascading Effects of Price Transmission

Rongsheng's price adjustment is not an isolated event. As one of the largest polyester filament producers in China, its pricing often serves as a bellwether. The timing is sensitive—coinciding with the traditional off-season and a replenishment window for downstream weavers. The polyester POY bullish-bearish score has dropped to -1, indicating short-term bearish sentiment dominates. More notably, the polyester staple fiber market has also been affected. On July 3, the main contract for PSF on Zhengzhou Commodity Exchange closed at 6,810 yuan/ton, with a settlement price of 6,792 yuan/ton, while open interest increased by 12,741 lots, signaling growing divergence between bulls and bears.

This means polyester filament price fluctuations have transmitted through supply chain sentiment to PSF futures. The increase in open interest suggests market participants are betting on future direction rather than exiting. For physical enterprises, futures signals typically lead spot prices by 2-3 weeks, so PSF prices may remain under pressure short-term.

Inventory Pressure and Downstream Dynamics

The fundamental driver of this price cut is upstream inventory accumulation. Rongsheng, as an integrated refinery-petrochemical operator, has maintained high operating rates across its PTA-polyester filament chain. However, downstream weaving orders have been sluggish since late June, with water-jet loom operating rates in Jiangsu and Zhejiang falling from a peak of 85% to around 75%, leading to passive inventory buildup. Price reductions become the most direct way to relieve pressure.

For buyers, this is a rare window for negotiation. However, cost support for polyester filament has not collapsed—feedstock PTA prices remain range-bound at 5,300-5,400 yuan/ton. If crude oil rebounds, further declines in filament prices will be limited. Additionally, replenishment pacing varies among major weaving clusters like Shengze and Keqiao: large mills with ample inventories are destocking, while small and medium weavers may take advantage of lower prices to build positions gradually.

Practical Recommendations

For Buyers - Use the current widened bargaining window to lock in prices for 1-2 weeks of filament supply with suppliers, but avoid bulk purchases to guard against further price drops. - Monitor the correlation between PTA and PSF futures; if the PSF main contract breaks below 6,700 yuan/ton, filament may follow suit, suggesting delaying purchases. - Differentiate by specification: common items like 150/48 have ample supply and room for negotiation, while fine-denier yarns like 75/36 have limited bargaining power due to concentrated capacity.

For Exporters - Incorporate price fluctuation clauses in export orders to prevent domestic raw material declines from eroding margins. Given current yuan volatility and lower feedstock costs, export quotes can be moderately reduced to win orders. - Track polyester filament prices in Southeast Asia; if domestic prices remain higher than in Vietnam or Indonesia after the cut, watch for order diversion. Consider short-term floating price agreements with overseas clients.