In early July 2026, Rongsheng Petrochemical, a leading Chinese polyester filament yarn producer, reduced prices for several semi-dull POY specs by 100-200 CNY per ton. The 75/36 spec was quoted at 8,100 CNY/ton, and 150/48 at 7,800 CNY/ton. This move directly injected bearish sentiment into the spot market, breaking the previous fragile stability.
Drivers of the Price Cut: Dual Pressure from Costs and Demand
The price adjustment is not an isolated event. On the cost side, upstream PTA prices have been weakening since late Q2, with new PX capacity additions and falling naphtha prices compressing PTA processing margins to year-to-date lows. Cost support for polyester filament has consequently loosened, forcing mills to pass inventory pressure downstream.
Demand signals are even more critical. Weaving mill operating rates have declined since May, with average water-jet loom utilization in Jiangsu and Zhejiang dropping to around 65%, below last year's levels. While apparel export orders have seen seasonal recovery, the overall increment has fallen short of expectations, leading mills to purchase only on a need-to-order basis with minimal stockpiling appetite.
As an industry bellwether, Rongsheng's price cuts often trigger follow-through moves by peers. A chain reaction could shift the entire market's bargaining center lower, further squeezing margins for smaller players.
Market Ripple Effects: Transmission from Filament to Staple Fiber
The shockwave quickly spread to related varieties. On July 3, 2026, the main polyester staple fiber contract (2609) on the Zhengzhou Commodity Exchange closed at 6,810 CNY/ton, with a settlement price of 6,792 CNY/ton, down about 1.2% week-on-week. More notably, open interest rose by 12,741 lots, indicating significantly increased divergence between bulls and bears at current levels.
From an industrial logic perspective, polyester staple fiber shares the same PTA and MEG raw material costs with filament. A filament price cut removes relative cost support for staple fiber. Meanwhile, staple fiber's downstream applications in nonwovens and cotton blends are also facing weak end-demand, making futures prices prone to further declines.
Inventory Cycle and H2 Outlook
The chemical fiber chain is currently transitioning from active destocking to passive inventory building. Rongsheng's price cut can be seen as an active destocking measure to relieve its own pressure before the off-season. However, downstream weavers and traders remain cautious, with market turnover staying low and price transmission proving difficult.
Historically, Q3 is a seasonal low-demand period for polyester filament, with high-temperature power cuts and environmental inspections potentially further suppressing operating rates. If upstream PTA prices fail to stabilize, polyester filament still has 200-300 CNY/ton of downside risk. For downstream buyers, now is not the time to bargain-hunt; instead, focus on support levels near production costs.