In early trading on July 30, China's futures market showed a stark divergence: polyester staple fiber (PSF), PTA, and bottle-grade chips all rose more than 1%, while cotton and cotton yarn fell 0.98% and 0.40% respectively. This is not a one-day anomaly but an early signal of profit redistribution along the textile chain.
Why the Synthetic Fiber Sector Strengthened
PSF futures settled at 7,428 points, up 1.48%, leading the chemical sector. PTA followed with a 1.02% gain to 5,740 points, and bottle-grade chips climbed 1.72% to 7,346 points. These three belong to the polyester chain and typically move together, indicating a common upstream driver.
Industry data shows international crude oil prices have been rising steadily, directly pushing up the cost of PX, the raw material for PTA, which in turn feeds into PSF and bottle-grade chips. But cost-push is only part of the story. Deeper down, polyester inventories have dropped to low levels. According to weekly data from China Chemical Fiber Information Network, inventory of PSF at mills in Jiangsu and Zhejiang has fallen for three consecutive weeks, with some mills even oversold. This means prices had strong underlying support even before oil rallied. When crude provided the catalyst, long capital naturally concentrated on these contracts.
Why Cotton and Cotton Yarn Fell
In stark contrast, cotton futures closed at 15,700 points, down nearly 1%. Cotton yarn fell a more modest 0.40% to 22,205 points. The fact that cotton yarn fell less sharply than cotton suggests that spinning margins are being squeezed but not yet broken.
Data from the National Cotton Market Monitoring System shows commercial cotton inventories in late July were still about 15% higher year-on-year. Although weaving mill operating rates remain above 60%, new orders are mostly small and urgent, lacking sustained large-volume support. This order structure discourages mills from building raw material inventories, forcing them to buy hand-to-mouth.
More critically, the price spread between PSF and cotton has widened. The current ratio of PSF to cotton prices stands at about 0.47, near a three-year low. For fabric buyers, the cost advantage of substituting cotton with synthetics has grown significantly. This substitution effect is particularly visible in traditional cotton sectors like denim and shirting, where some weavers have already adjusted their blending ratios to increase polyester content.
Implications for the Textile Chain
The divergence in futures performance highlights different transmission efficiencies. The polyester chain transmits cost changes almost instantly, while the cotton chain is slower due to high inventory overhang at the upstream level.
For textile companies, the key risk is not a single day's price move but the long-term shift in profit distribution between the two chains. If synthetic fibers continue to strengthen, more spinning capacity will shift toward synthetics, potentially shrinking the cotton spinning sector. This structural adjustment will not happen overnight, but the July 30 session has already given a clear directional signal.