This week (September 8th to September 12th, 2025), the polyester filament market as a whole showed a weak and volatile pattern, failing to usher in the prosperous market of the traditional “Golden September”. According to the Commodity Market Analysis System of Shengyi Society, as of September 12th, the mainstream polyester filament factories in Jiangsu and Zhejiang Province quoted POY (150D/48F) at 6650-6850 yuan/ton, polyester DTY (150D/48F low elasticity) at 8000-8150 yuan/ton, and polyester FDY (150D/96F) at 6950-7200 yuan/ton.
Insufficient cost support: Despite some positive developments in the crude oil market (such as OPEC’s October production increase plan being lower than expected), PTA’s own supply pressure has increased due to the restart of some maintenance facilities. As of September 9th, the spot price of PTA is between 4600-4610 yuan/ton. The price of another raw material, ethylene glycol (MEG), also experienced a slight decline. The weakness of the raw material side makes polyester filament lack strong upward momentum in cost.
Weak demand performance: The recovery of demand during the traditional “Golden September and Silver October” peak season is relatively weak. Although the operating rate of downstream weaving enterprises has rebounded (the comprehensive operating rate of weaving machines in Jiangsu and Zhejiang regions is about 64%), it still decreased by 4.4 percentage points compared to the same period last year. The high inventory of raw fabric has resulted in no significant increase in the total number of new orders, and downstream users are adopting a cautious and wait-and-see attitude, with procurement mainly focused on small orders for essential needs. This makes the production and sales data of polyester filament continue to be weak, making it difficult to increase volume.
Supply pressure and inventory: Although mainstream production enterprises have cooperated to reduce production in the early stage to maintain the market, the inventory of polyester filament in polyester factories is gradually recovering. In order to seize market share, some manufacturers have a strong willingness to ship, and there is a phenomenon of negotiating discounts when actual transactions are made.
Market sentiment is sluggish: Against the backdrop of no substantial positive developments in costs, demand, and supply, there is a strong wait-and-see atmosphere in the market. The industry’s concern about the “long-term decline” has intensified.
It is expected that the price of polyester filament will remain weak and fluctuate in the short term. We need to pay attention to the changes in PTA raw material prices and further production and sales strategies of polyester filament enterprises. If there is a significant strengthening on the cost side or an improvement in downstream demand, it may provide a slight boost to the market.

According to the Commodity Market Analysis System of Shengyi Society, since September, negative factors have remained, and the domestic adipic acid market continues to weaken. On September 1st, the average market price of adipic acid was 7383 yuan/ton. On September 11th, the average market price of adipic acid in China was 7300 yuan/ton, a decrease of 1.13%.
The bearish trend continues to decline in the domestic adipic acid market
Since September, the market for cyclohexanone, a raw material for adipic acid, has remained weak and stable, while the market for pure benzene raw materials has declined. Terminal rigid demand has weakened, and the market for adipic acid has continued to decline. As of September 11th, the price has dropped to 7300 yuan/ton, with average market transactions and mediocre sales. The combination of negative factors has led to a weak decline in the market for adipic acid.
An analyst from Shengyi Society believes that in late September, the rigid demand in the terminal industry was sluggish, and the boosting effect of the raw material market was limited. Therefore, the market for adipic acid will continue to weaken in the future.

1、 Price trend
According to the commodity analysis system of Shengyi Society, the price of light soda ash remained stable on September 8th, with a market average price of 1186 yuan/ton, a decrease of 24 yuan/ton compared to the beginning of the month price of 1210 yuan/ton, a decrease of 1.98% from the beginning of the month.
2、 Market analysis
Since September, the soda ash market has continued to operate weakly. On the demand side, downstream follow-up is average, with low enthusiasm for entering the market and a small amount of low-priced essential purchases; On the supply side, the overall utilization rate of soda ash production capacity has improved, market inventory has increased, and some enterprises have shifted their focus of transactions to promote shipments. The fundamental situation in the market continues to be strong in supply and weak in demand.
On the demand side: According to the commodity analysis system of Shengyi Society, the glass market has fluctuated narrowly since September, with an average market price of 14.00 yuan/square meter as of the 8th, an increase of 0.86% from the beginning of the month. The glass market production line is running steadily, with a small number of terminal purchases following up. The trading atmosphere on site is still acceptable, and the market supply and demand are relatively stable. Some companies have good shipments, and glass prices have slightly increased.
Future forecast: Currently, the domestic soda ash spot market is mainly weak and stable, with high market inventory and lack of confidence among industry players. The downstream glass market is in urgent need of follow-up, with limited support for soda ash and a supply-demand game within the market. It is expected that the soda ash market will experience weak consolidation in the later stage, depending on downstream market demand.

Last week (September 1-7, 2025), downstream nylon fibers followed up on demand, with weak market consolidation and stable operation, and prices remained stable. The market trend for high-speed spinning of raw material nylon PA6 slices is stable, with limited cost support and no significant improvement in downstream market demand. Manufacturers are holding onto the demand and following up on it. The overall speed of goods delivery in the market is average, and there is a strong wait-and-see atmosphere among industry players. The price fluctuations in the nylon fiber market are not significant.
Nylon filament prices remain weak and stable
According to the Commodity Market Analysis System of Shengyi Society, the price of nylon filament remained stable at a low level last week (September 1-7, 2025). As of September 7, 2025, DTY (premium product) of nylon filament in Jiangsu region; 70D/24F) quoted 14320 yuan/ton; Nylon POY (premium product; 86D/24F) quoted 12050 yuan/ton; The price of nylon FDY (premium: 40D/12F) is quoted at 14900 yuan/ton, which is the same as the previous period.
The raw material side has experienced a slight decline
In terms of cost: Last week (September 1-7, 2025), the spot market price of caprolactam slightly decreased during the week. The weekly closing price of Sinopec caprolactam was 9120 yuan/ton (interest free for six-month acceptance). The nylon PA6 chip market was mainly weakly consolidated, with stable price trends and weak cost support. As of September 7, 2025, the benchmark price of caprolactam in Shengyi Society was 8920 yuan/ton, mainly due to weak price consolidation, with a weekly decline of 0.37%. During the week, the market price of high-speed spun nylon PA6 chips remained weak, stable, and fluctuating, with weak cost support being the main factor.
Supply and demand: During the week, the operating rate of some nylon filament manufacturers’ facilities decreased, and the overall market supply was sufficient. However, the industry inventory level still showed an increasing trend, and the supply side performance was poor; The demand in the end market is weak, and some downstream manufacturers have reduced production or switched production, resulting in a decrease in demand for nylon filament. It is difficult to find favorable support from the demand side, and many parties are following suit with rigid demand. Many industry players are adopting a cautious and wait-and-see attitude.
Future forecast
Cost aspect: In terms of caprolactam, the expectation for pure benzene is weak, and slice manufacturers have low enthusiasm for purchasing caprolactam. It is expected that the caprolactam market will remain weak and mainly consolidate at a low level in the short term; In terms of nylon PA6 chips, cost support is limited, and the supply level of PA6 chips in the market may continue to improve. Downstream market demand is weak, and it is expected that the market price of nylon PA6 chips will weakly decline.
Supply and demand: Traditional market demand is expected to improve in September, and the trading atmosphere will also improve. Therefore, it is expected that there may be an increase in demand for nylon filament market next month. However, under the current inventory pressure, some nylon filament manufacturers may have the possibility of reducing their production capacity, while the industry continues to release new production capacity, resulting in overall supply pressure remaining relatively high.
Overall, the upstream raw material caprolactam spot market and nylon PA6 chip market will continue to operate weakly, with a lack of cost support, high supply pressure, and difficulty in improving downstream market demand. Follow up on demand will be the main focus, with limited positive news. Business analysts predict that the short-term nylon filament market will continue to be weak and stable, with weak price consolidation as the main trend.

According to the Commodity Market Analysis System of Shengyi Society, from September 1st to 4th (as of 15:00), the domestic methanol market in East China port quotations fell from 2253 yuan/ton to around 2271 yuan/ton, with a price increase of 0.81% during the period, a month on month decrease of 4.55%, and a year-on-year decrease of 4.78%. The supply continues to increase, and the accumulation of enterprise inventory has led to price reductions and order taking. Although downstream profits have recovered, the improvement is not significant at the moment, and the domestic methanol market is weak and declining.
As of the close on September 5th, the closing price of methanol futures on Zhengzhou Commodity Exchange has risen. The main contract for methanol futures, 2601, opened at 2381 yuan/ton, with a highest price of 2424 yuan/ton and a lowest price of 2378 yuan/ton. It closed at 2415 yuan/ton in the closing session, up 35 yuan/ton or 1.47% from the previous trading day’s settlement. The trading volume is 684742 lots, the position is 777813, and the daily increase is -24180.
On the cost side, coal supply has rebounded, demand has fallen seasonally, terminal demand for replenishment has increased, and prices have fluctuated narrowly, providing limited support for methanol prices. The cost of methanol is influenced by negative factors.
On the demand side, glacial acetic acid: The acetic acid industry in Henan Province is operating at a low level. Formaldehyde: The capacity utilization rate of the formaldehyde industry in Henan Province remains at 51.44%, and the operating load remains stable. Dimethyl ether: The operating load of the dimethyl ether industry in Henan has decreased month on month. Most downstream products are affected by methanol prices, and the impact on methanol demand is mixed.
On the supply side, the overall recovery of the equipment exceeds the loss, resulting in an increase in capacity utilization. Negative factors affecting the methanol supply side.
In terms of external markets, as of the close of September 4th, the closing price of CFR Southeast Asia methanol market was 321.5-322.5 US dollars/ton. The FOB US Gulf methanol market closed at 94-95 cents per gallon; The closing price of the European FOB Rotterdam methanol market was 292.5-293.5 euros/ton, down 1 euro/ton.
In the future market forecast, multiple factors such as the adjustment of upstream and downstream purchase and sales rhythms, and fluctuations in freight rates will intertwine, leading to frequent fluctuations in methanol spot market prices. The methanol analyst from Shengyi Society predicts that the domestic methanol spot market will mainly experience fluctuations and consolidation.