The polyester filament market is in a classic tug-of-war between upstream push and downstream resistance. By the third week of July, PTA social inventories had fallen to about 2.053 million tons, declining for three consecutive weeks. Combined with crude oil surging over 11% in two days due to US-Iran conflict, the cost-side push is undeniably strong. However, weaving mill operating rates remain at low off-season levels, with insufficient new orders. Downstream purchases are driven only by speculative restocking based on geopolitical sentiment, lacking genuine demand support. The short-term outcome of this game will provide clear signals in the next two weeks.
Background
Geopolitical risks are reshaping the cost transmission path of the chemical fiber industry. In just two trading days this week, international oil prices accumulated gains of over 11%, the largest two-day percentage increase since mid-March. The escalation of US-Iran conflict directly pushed up crude oil risk premiums. Oil prices are now almost entirely anchored to geopolitical developments, with a strong short-term trend unlikely to change.
On the PX front, social inventories have remained at low levels since 2026 compared to the same period in 2025. By June, PX social inventories had decreased by 1.77 million tons year-on-year. Besides low domestic operating rates and reduced output, first-half PX imports are estimated at about 5.017 million tons, with supply tightening overall, providing clear bullish support.
PTA shows a similar continuous destocking trend. Social inventories were about 2.136 million tons in the first week of July, 2.078 million tons in the second week, and further down to 2.053 million tons in the third week, decreasing by 58,000 tons and 25,000 tons respectively. Meanwhile, PTA operating rates remain low, and the tight supply continues to provide effective cost support for downstream polyester filament.
Industry Impact
The resonance of upstream bullish factors is transmitting to polyester filament factories. Due to expectations of tighter raw material supply triggered by US-Iran conflict, downstream weaving mills conducted timely bargain restocking, leading to a slight decline in industry inventories. Currently, overall industry inventory is about 26.8 days, with POY at 23.8 days, FDY at 26.4 days, and DTY at 32 days. Polyester plant inventory pressure remains manageable, with major producers maintaining production cuts, easing market supply pressure.
Notably, some texturizing mills face relatively obvious inventory accumulation, and circulation channels are not smooth. However, these mills are simultaneously implementing production cuts and offering discounts to clear stock, so inventory remains within controllable expectations and has not formed systemic risk. Looking at the entire upstream chain, crude oil geopolitical risk premiums, low PX-PTA inventories and operating rates, and polyester plant production cuts have formed a consistent bullish resonance.
However, weak terminal demand is effectively offsetting this upward push. The current period is a traditional textile off-season, with downstream weaving mills operating at low rates and new orders lacking momentum. Downstream raw material purchasing intentions are clearly cautious. Apart from periodic bargain restocking triggered by geopolitical events, there is no sustained, large-scale demand-driven support.
In other words, the recent phased improvement in polyester filament production and sales is more about sentiment-driven speculative restocking than a recovery in actual end-order demand. This restocking behavior has poor sustainability. Once geopolitical sentiment cools or oil prices fluctuate, downstream will quickly return to a wait-and-see stance, leading to falling production and sales and renewed inventory accumulation.