On August 31, the average sales-to-output ratio of sampled polyester filament makers jumped to 82.8%, surging 48.1 percentage points from the previous session. Such a one-day leap is rare in recent chemical fiber daily reports, signaling a collective shift in market sentiment: cost-side support, mills' reluctance to sell at low prices, and downstream buyers' fear of rising costs triggered a wave of small replenishment orders.
The rapid rebound in the sales ratio does not necessarily mean a broad recovery; it is more of a pulse-like transaction driven by price expectations. The individual data from sample enterprises varied widely—ranging from a low of 40% to a high of 260%, with a median around 70%. This divergence indicates that not all polyester filament producers benefited equally, and some small and medium-sized mills still face insufficient orders.
What the Data Signals
The jump from 34.7% to 82.8% in the sales ratio appears to be a concentrated release of downstream buying interest, but the underlying drivers are the resonance of cost-side strength and inventory cycles. Recent firmness in polyester raw material prices squeezed the theoretical processing margins of polyester filament, prompting mills to hold back sales at low prices. Meanwhile, downstream weaving mills had maintained low raw material inventories and, after the rise in price expectations, were forced to shift from just-in-time purchasing to opportunistic stockpiling.
It is worth noting that only two enterprises reported ratios above 200%, while nearly 40% still recorded ratios below 60%. This suggests that the replenishment activity was concentrated among a few leading producers with cost advantages and strong customer bases, rather than an industry-wide improvement. For weaving mills, current raw material inventories remain historically low, and if prices continue to rise, subsequent restocking may intensify.
Cost Transmission and Price Expectations
The price trend of polyester filament is essentially a game between upstream PTA/MEG costs and downstream demand elasticity. The cost-side boost at the end of August mainly stemmed from a rebound in crude oil and polyester raw material prices, rather than a fundamental improvement in end-user orders. Such cost-push rallies tend to be short-lived and pulse-like—once raw material prices stabilize or fall, the logic for raising polyester filament prices quickly weakens.
Historical experience shows that a single-day jump of more than 40 percentage points in the sales ratio is often followed by one to two weeks of higher transaction volumes, but without sustained downstream demand, upward price momentum may be capped. The current operating rate of downstream weaving mills has not shown a significant synchronized increase, implying that this round of restocking is more defensive—driven by fear of price hikes rather than actual shortages.
Inventory Cycle and Purchasing Pace
The polyester filament industry is now at a critical point in its inventory cycle. Earlier low sales ratios led to inventory accumulation, but the concentrated restocking at the end of August pushed the average sales ratio back above 80%, accelerating the destocking process. However, the relief is highly uneven across enterprises—mills with a 260% ratio may be near zero inventory, while those at 40% are still seeing inventories rise.
For buyers, this rebound does not necessarily signal the start of a one-way price increase. Polyester filament capacity remains relatively ample, and if downstream weaving orders do not recover in tandem, the sustainability of price hikes is questionable. Buyers are advised to monitor raw material price trends and their own order books, and to rationally decide restocking volumes to avoid concentrated purchases at the peak of the pulse.