The thermometer of the polyester filament market malfunctioned on September 3. The average sales-to-output ratio of sample enterprises fell to 25.8%, down 13.3 percentage points from the previous trading day. This figure not only falls below the industry health line but also reveals an insurmountable price gap forming between upstream and downstream. When high polymerization costs collide head-on with strong downstream resistance, the short-term balance of the chemical fiber supply chain has been broken.
What the Data Reveals
What does a 25.8% sales-to-output ratio mean? Among the sample enterprises, over 60% saw ratios at or below 20%, with some even recording zero. This distribution is not random volatility but reflects weak terminal orders and a general slowdown in purchasing pace. Notably, even though a few enterprises achieved a 70% ratio, they failed to reverse the overall decline, indicating that market divergence is intensifying—head enterprises may rely on long-term contracts to maintain operations, but small and medium manufacturers are clearly feeling the chill from the demand side.
On the price front, persistently high polymerization costs have become a direct driver for manufacturers to raise prices. However, cost-push price increases often have limited effect during periods of weak demand. Downstream weaving enterprises have not passively accepted higher raw material prices; instead, they have responded by reducing operating rates and postponing inventory replenishment. This game of "you raise prices, I don't buy" has trapped the polyester filament market in a typical volume-price divergence: quoted prices rise, transactions remain sluggish, and inventory pressure quietly accumulates.
Cost Transmission and Supply Chain Game
The cost side of polyester filament is mainly influenced by PTA and MEG prices, which in turn are closely linked to international oil prices and PX supply. The current high polymerization costs mean that upstream cost pressures have been transmitted to polyester plants, forcing them to raise prices to alleviate profit compression. However, the problem is that the pace of downstream demand recovery lags far behind the cost increase. The textile end-market, whether apparel or home textiles, has not yet shown strong restocking intentions, leaving polyester plants in the middle as a "sandwich layer" between costs and demand.
The deeper impact of this game lies in the redistribution of profits across the supply chain. When upstream raw material prices remain firm while downstream acceptance is limited, the processing spread of polyester plants is continuously compressed, and some small and medium manufacturers may face loss risks. For buyers, this means that raw material prices have limited room for significant downward adjustment in the short term, but they should also be wary of potential price volatility if manufacturers are forced to cut prices to reduce inventory due to persistently weak demand.
Ripple Effects in Industrial Clusters
Major polyester filament production capacity is concentrated in industrial belts such as Tongxiang and Xiaoshan in Zhejiang, and Shengze in Jiangsu. The sluggish sales-to-output ratio has already generated direct feedback in these regions: some factories have begun to adjust production plans, reduce operating rates, and even show signs of sporadic maintenance shutdowns. Weaving enterprises in the Shengze area, as major downstream users of polyester filament, have further exacerbated upstream inventory accumulation by slowing their purchasing pace. This regional linkage means that the adjustment in the polyester filament market is not just a single link issue but a challenge faced by the entire industrial cluster.
Historically, a sales-to-output ratio persistently below 30% often signals that the market is entering an active destocking phase. If the data does not recover in the coming weeks, manufacturers may resort to price promotions to stimulate demand, and polyester filament prices may then experience a catch-up decline. Conversely, if costs continue to strengthen and downstream players enter the market for restocking at lower prices, the market may stabilize quickly.