On September 2, the polyester filament market showed a rare divergence: the average sales-to-output ratio of sampled enterprises fell to only 39.1%, down 0.7 percentage points from the previous trading day, yet most manufacturers insisted on raising prices. Behind this divergence lies the combination of weak cost transmission and sluggish end-user demand, indicating that the polyester chain may enter a pattern of price rigidity and shrinking transactions toward the end of the third quarter.
What the Data Reveals
A 39.1% sales-to-output ratio means that over 60% of the day's output did not translate into actual sales. The distribution across sample enterprises ranged from 0% to 310%, showing a huge gap between leading and lagging producers. The extreme 310% figure suggests some companies locked orders through low prices or long-term contracts, while the 0% samples were entirely stuck in a situation of quoted prices but no buyers. This polarization is not accidental; it reflects differentiated responses to price hikes across different customer structures.
The intention behind price increases was to repair processing margins, but downstream users generally chose to wait and see, with only partial replenishment. This indicates that the price hike was not demand-driven but a passive response to cost pressures. When upstream cost increases cannot be fully absorbed by downstream willingness, price hikes only further compress transaction volumes. Weaving mills, with sufficient raw material inventories, see no urgency to chase higher prices, directly preventing the sales-to-output ratio from recovering.
Transmission Logic of Low Sales Ratio
The continuous decline in polyester filament sales-to-output ratio is transmitting pressure upstream along the chain. Finished goods inventory days at polyester plants are passively accumulating. If the ratio remains below 50% next week, some plants may be forced to cut prices or reduce operating rates. Historically, September is the prelude to the traditional peak season, but this year terminal orders have started slowly. Greige fabric destocking has been slower than expected, and loom utilization increases are limited, resulting in lower actual consumption of polyester filament compared to previous years.
On the cost side, fluctuations in crude oil and PTA have not provided clear direction. Although some raw material prices rebounded slightly, sustainability is questionable, leaving filament producers without solid support for price increases. Market participants generally expect that if costs cannot be effectively raised, filament prices will struggle to maintain an upward trend and may even see hidden discounts behind announced increases. For buyers, this means it is not an optimal time for substantial stockpiling; demand-based procurement remains the safer strategy.
Structural Differences by Region and Product
From the distribution of sales data, differences across varieties and regions deserve attention. Sales-to-output ratios for conventional FDY and POY are generally low, while differentiated products such as cationic and flame-retardant types maintain relatively better shipment momentum. This reflects stronger demand resilience for functional and high-value-added products compared to standard specifications. In major polyester clusters like Shengze, Changxing, and Xiaoshan, pricing strategies also diverge: some large mills insist on firm prices, while small and medium enterprises are more flexible in negotiations.
This divergence implies that the era of simply passing on costs through price hikes is over. Downstream users are becoming more price-sensitive and place greater emphasis on supply stability and product quality. Rather than engaging solely in price competition, filament manufacturers should focus on product mix adjustment and customer service to lock in high-retention clients through differentiated offerings.
Outlook and Operational Strategies
In the short term, the polyester filament market may continue its weak equilibrium. If the sales-to-output ratio remains below 40%, inventory pressure will intensify, raising the risk of price corrections. Conversely, if terminal orders concentrate around mid-September, the ratio could quickly rebound to above 80%, providing solid support for prices. The key variables are the replenishment pace of downstream weaving mills and the recovery of overseas orders.
In the medium term, profit distribution across the polyester chain is undergoing subtle changes. Capacity expansion in upstream PX and PTA has shifted profit centers downward, squeezing processing margins in the filament segment. Under these circumstances, competition across the chain will intensify, and price fluctuations may become more frequent. Companies should closely monitor daily sales-to-output data as a core indicator for adjusting business strategies.