On September 1, trading sentiment in the polyester filament market cooled sharply. The average sales-to-output ratio of sampled enterprises stood at only 39.8%, a steep decline of 43.0 percentage points from the previous trading day's close. This figure is not just a one-day fluctuation; it is a direct reflection of the game between upstream and downstream. The day before, some manufacturers saw ratios surge to 300%-400% in late-session trading, prompting price hikes across most specifications. But the market's ability to absorb these increases clearly fell short.
What the Data Tells Us About Supply and Demand
The sales-to-output ratio is a core indicator of activity in the polyester filament market. On September 1, data points were widely dispersed, ranging from a low of 10% to a high of 150%. A few enterprises recorded ratios of 80%, 100%, or 150%, but most samples hovered between 15% and 40%. This divergence suggests that price increases did not gain universal acceptance; only certain specifications or customer segments accepted the new quotes.
More notably, the late-session surge in sales the previous day was largely driven by downstream buyers rushing to stock up ahead of expected price hikes—a classic "pre-emptive" move. When the higher quotes actually materialized, downstream resistance intensified, and inquiry activity cooled. This pattern of "surge, hike, shrink" is familiar in the chemical fiber market and often signals that short-term price increases lack sustained demand support.
On the cost side, upstream raw materials PTA and MEG have seen stable prices recently, with no significant upward momentum. This suggests the current price hikes are manufacturer-led rather than cost-driven. Without cost support, price increases are more vulnerable to being challenged in a weak demand environment.
Industrial Transmission and Regional Response
The main production areas for polyester filament are in Tongxiang, Xiaoshan (Zhejiang), and Shengze (Jiangsu). The decline in the sales-to-output ratio directly leads to a re-accumulation of factory inventories. According to public industry data, a previous round of destocking had brought inventories to reasonable levels, but if the ratio stays below 50%, inventory pressure could reappear within a week.
Downstream weaving enterprises, especially the water-jet loom clusters in Shengze and Changxing, are extremely sensitive to raw material prices. After the price hikes, many weaving mills chose to wait and see, reducing raw material purchases and first drawing down their own inventories. This "buy on rising, not on falling" psychology may briefly boost transactions early in a price increase, but once prices exceed psychological thresholds, procurement pace quickly slows.
Transmission to the foreign trade segment is more complex. Polyester filament price fluctuations directly impact the cost of exported fabrics. For foreign trade companies with long order cycles, higher raw material costs mean compressed profits. If the RMB exchange rate also fluctuates, the dual pressure may reduce their willingness to take new orders.
Short- and Medium-Term Price Expectations
Historically, after a single-day plunge in the sales-to-output ratio, manufacturers often adjust their pricing strategies over the following days. If downstream resistance persists, some may offer discounts or hidden price cuts to stimulate shipments. The September 1 data has already signaled that price hikes are meeting resistance. The trend over the next week will be a critical observation window.
In the medium term, polyester filament prices will still depend on supply and demand fundamentals. There is no clear recovery in terminal textile and apparel demand, and overseas orders lack explosive growth. The industry remains in an overcapacity cycle, making any unilateral price increase difficult to sustain. For buyers, this may be a window for bargaining; for mills, vigilance against inventory buildup is warranted.