The market price of butadiene rubber in August slightly increased. According to the commodity market analysis system of Shengyi Society, as of August 28th, the market price of butadiene rubber in East China was 12200 yuan/ton, an increase of 2.01% from 11960 yuan/ton at the beginning of the month. The price of raw material butadiene fluctuates and rises, causing the cost center of butadiene rubber to shift upwards; The production of butadiene rubber has fluctuated slightly, and there is not much pressure on the supply side; Downstream tire production has slightly increased, mainly supporting the demand for butadiene rubber. As of August 28th, the mainstream reports for Qilu, Daqing, Sichuan, and Yangtze Shunding in East China are 11900~12400 yuan/ton.
The price of butadiene fluctuated slightly higher in August, and the cost support of butadiene rubber strengthened. According to the Commodity Market Analysis System of Shengyi Society, as of August 28th, the price of butadiene was 9283 yuan/ton, an increase of 2.58% from 9050 yuan/ton at the beginning of the month.
In August, there was a slight fluctuation in the domestic butadiene rubber plant. As of the end of August, the domestic butadiene rubber production started at around 6.90%, and the supply pressure was not significant.
Demand side: Downstream tire production slightly increased in August, providing strong support for the demand in the butadiene rubber market. As of August 22, the construction of semi steel tires by domestic tire companies has slightly increased to around 7.40%; The construction of all steel tires by tire companies in Shandong Province has slightly increased to around 6.5%.
Market forecast: From a fundamental perspective, analysts from Shengyi Society believe that raw material prices have slightly increased, downstream tire production has slightly increased, and coupled with the arrival of the peak season, it is expected that butadiene rubber will continue to fluctuate and rise in the later period.

According to the Commodity Market Analysis System of Shengyi Society, the focus of polyester prices has been partially raised today. As of August 27th, the mainstream polyester filament factories in Jiangsu and Zhejiang, POY (150D/48F), quoted at 6800-6950 yuan/ton, polyester DTY (150D/48F low elasticity) at 8000-8150 yuan/ton, and polyester FDY (150D/96F) at 7000-7200 yuan/ton.
The price of polyester filament has shown a stable but rising trend recently, and many mainstream production enterprises have raised their quotations. Since the beginning of August, the polyester filament market has entered a continuous price increase mode. On August 11th, 12th, 13th, 20th, 21st, and 26th, mainstream enterprises announced a price increase of 50 yuan/ton, directly promoting the steady upward trend of market quotations.
Cost support: The main raw material PTA has been operating at a strong price recently, with current market prices around 4850-4870 yuan/ton. The strong price of PX provides support for PTA, while multiple PTA production companies have announced maintenance plans, and it is expected that supply will tighten. These have all supported the price of polyester filament from the cost side.
On the supply side: Previously, mainstream production enterprises had joint production cuts to maintain market order by regulating the supply scale, which to some extent eased the supply-demand contradiction and supported prices.
On the demand side: The downstream weaving start-up rate has slightly rebounded recently. At the same time, the traditional peak consumption season of “golden September and silver October” is approaching, and the market is looking forward to the recovery of demand in the future, especially in niche markets such as Oxford cloth and luggage cloth, which have performed well. In addition, the extension of the window period for some tariff rates imposed by the United States on China by 90 days has also boosted expectations for foreign trade exports to a certain extent. Mainstream production enterprises have a strong willingness to raise prices.
Inventory level: The inventory pressure in the industry has recently eased. As of recent data, POY inventory is around 22 days, FDY inventory is around 25 days, and DTY inventory is around 34 days, indicating an overall improvement in inventory structure compared to the previous period. The decrease in inventory has also provided some support for prices.
Business Society believes that cost support is expected to remain strong, coupled with traditional peak season demand expectations and enterprise willingness to raise prices. These factors may continue to drive prices upward, and there is a high possibility of strong fluctuations in polyester filament prices in the short term. It is still necessary to pay attention to the actual recovery of downstream demand.

Last week (August 18-24, 2025), the upstream raw material market for nylon filament showed a weak trend with a slight decline. The nylon PA6 slicing market was mainly consolidating, with insufficient cost support and high inventory levels in the market. The industry supply was sufficient, and there was no sign of improvement in downstream market demand. The probability of downstream enterprises opening up was not high, and they held onto rigid demand procurement in multiple aspects. The trading atmosphere in the market was not good, and many operators held a cautious and wait-and-see attitude. The nylon filament market was weak and stable, with prices remaining stable at a low level.
Nylon filament prices remain weak and stable
According to the Commodity Market Analysis System of Shengyi Society, last week (August 18-24, 2025), the price of nylon filament remained stable at a low level. As of August 17, 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 (August 18-24, 2025), the spot market price of caprolactam remained weak and stable. The weekly closing price of caprolactam from Sinopec was 9575 yuan/ton (interest free for six-month acceptance). The nylon PA6 chip market was mainly weakly consolidated, with a weekly decline of 0.64%, indicating weak cost support. As of August 24, 2025, the benchmark price of caprolactam in Shengyi Society was 8986 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 be dominated by weak and low-level consolidation next week; In terms of PA6 slicing, cost support is limited, and the supply level of PA6 slicing market may continue to improve. Downstream market demand is weak, and it is expected that the market price of nylon PA6 slicing will weakly decline.
Supply and demand: August belongs to the off-season of traditional demand in the market, coupled with the lack of signs of improvement in terminal market demand and low purchasing enthusiasm in downstream markets. Therefore, it is expected that the demand for nylon filament market may decrease next month. If there is no significant improvement in demand, under the pressure of large inventory, some nylon filament manufacturers may have the possibility of reducing production capacity, while the industry continues to release new production capacity. Therefore, it is expected that the supply of nylon filament market will decrease next month.
Overall, both the upstream raw material caprolactam spot market and the nylon PA6 chip market may continue to decline, with a lack of cost support and difficulty in improving downstream market demand. The demand side is dragging down the market trend, and under the dual negative factors, analysts from Shengyi Society predict that the short-term nylon filament market will remain weak and stable, with weak price consolidation as the main focus.

Aluminum prices fluctuated horizontally in August
Aluminum prices fluctuated horizontally in August. According to the Commodity Market Analysis System of Shengyi Society, as of August 25, 2025, the average price of aluminum ingots in the East China market in China was 20793.33 yuan/ton, an increase of 0.95% from the market average price of 20596.67 yuan/ton on August 1.
Basic situation of aluminum ingots in August
On the supply side, with the gradual release of a small amount of replacement capacity, domestic primary aluminum production has achieved a slight increase, and the overall supply pattern remains stable. The downstream demand side is showing a differentiated trend of “rebounding momentum for replenishing inventory but encountering obstacles in spot procurement”: on the one hand, some enterprises have started peak season stocking and reserved inventory in advance to cope with the expected recovery of subsequent orders, driving a slight increase in the overall operating rate of domestic aluminum downstream; On the other hand, due to the rebound in aluminum prices, the shipment volume of end products has once again been under pressure and declined. The willingness of processing material enterprises to purchase spot goods has significantly weakened, and the pace of short-term demand release has been somewhat constrained. ​
From specific data, the overall operating rate of leading domestic aluminum downstream processing enterprises increased by 0.8 percentage points month on month last week, reaching 59.5%. The market recovery trend is mild and sustainable. Each sub sector has its own highlights: primary aluminum alloys: the operating rate increased by 1.0 percentage point month on month to 56.6%, and the purchasing volume of primary aluminum by top enterprises significantly increased, providing strong support for industry operation; ​
Aluminum sheet and strip: Benefiting from the peak season stocking orders of segmented categories such as cans and automotive panels, the operating rate increased by 1.0 percentage point to 65.0%, and the demand side growth momentum is clear; ​
Aluminum cables: With the acceleration of the power grid construction cycle and the continuous release of terminal delivery demand, the operating rate increased by 0.8 percentage points month on month to 62.6%, and the industry’s prosperity steadily rebounded; ​
Aluminum profiles: showing the characteristics of “differentiated recovery”, with orders in the automotive and photovoltaic fields maintaining an increase, driving the operating rate to rise slightly by 1.0 percentage point to 50.5%. However, the demand for building profiles is still in a sluggish range, dragging down the overall pace of recovery; ​
Aluminum foil: Driven by the restart of air conditioning foil production lines and the rebound in demand for decorative foil, the operating rate has increased by 0.9 percentage points to 69.3%, becoming a strong category in downstream sub sectors; ​
Recycled aluminum is facing the dual pressure of “weak demand during the off-season+continuous profit inversion”, coupled with policy shocks forcing some manufacturers to voluntarily reduce production, resulting in a slight decrease in operating rate by 0.1 percentage points to 53.0%, and significant short-term industry operating pressure. ​
Looking ahead to the future, it is expected that areas with strong demand certainty such as aluminum cables and aluminum strips will continue to rebound in late August; As the traditional peak consumption season of “Golden September and Silver October” approaches, the demand for aluminum foil and aluminum profiles (especially industrial profiles) is expected to be further driven, and the overall recovery pace of the domestic aluminum downstream market may gradually accelerate.
Macro influencing factors in August:
Overseas factors
Impact of US tariff policy: On August 18th, the United States expanded the scope of import tariffs on steel and aluminum, covering aluminum intermediate products, semi-finished products, and structural components. Although China’s exports of aluminum products to the United States accounted for only 6% (June 2025 data), short-term market sentiment was suppressed, and Shanghai aluminum prices fell to around 20500 yuan/ton at one point.

Geopolitical disruptions in supply expectations: On August 25th, Russia suspended its export of aluminum ingots to Italy due to diplomatic events, and aluminum prices on the London Metal Exchange rose by 4%, highlighting the impact of international supply chain stability on prices.
Last Friday, the dovish turn ignited the market, and expectations of a September interest rate cut quickly rose, causing the US dollar to plummet.
Future expectations
In the short term, aluminum prices in August are expected to experience strong fluctuations. Expected operating range is 20500-21100 yuan/ton.

During the week, the operating load of Zhejiang Petrochemical gradually increased, and the overall supply was abundant. Although the contract demand was relatively stable, the spot market trading was not smooth, and local inventory pressure still existed. The market remained deadlocked and watched. As of August 22nd, the mainstream negotiation for container self pickup at East China ports is between 8200-8300 yuan/ton, which is the same as last week; The short distance delivery to the Shandong market is negotiated at around 8050-8150 yuan/ton, which is the same as last week.
Abundant supply:
During the week, the operating load of Zhejiang Petrochemical’s 520000 ton acrylonitrile plant in the East China market gradually increased, and it will gradually recover to around 95% this week. Daqing Petrochemical’s 80000 ton acrylonitrile plant was shut down for maintenance for about 24 days on August 20th. The overall capacity utilization rate has improved, and the supply is still saturated, but the spot buying gas continues to be insufficient, and local enterprise inventories have risen. According to statistics, as of August 21, the weekly capacity utilization rate of domestic acrylonitrile factories was 73.26%, an increase of 0.81% compared to the same period last week. The weekly output was about 81900 tons, an increase of 0.09 million tons compared to the previous cycle. As of August 20th, the total inventory was around 46000 tons, an increase of+0.05 million tons from last week.
Insufficient demand:
The capacity utilization rate of major downstream industries of acrylonitrile varies, among which the capacity utilization rate of ABS is 71.10%, unchanged from last week; The capacity utilization rate of acrylic fiber enterprises is 74.09%, which is -2.79% compared to last week. Daqing Petrochemical is undergoing maintenance; The utilization rate of acrylamide production capacity was 53.54%, an increase of 5.90% compared to last week, and facilities in Anhui, Henan and other places resumed operation. The procurement of raw material acrylonitrile is still insufficient, and the spot trading atmosphere in the market is still average.
Cost reduction:
During the cycle, upstream propylene prices fluctuated and fell, and the cost of raw materials for acrylonitrile production decreased. At the same time, acrylonitrile prices remained stable, and the production loss situation slightly improved this week. According to statistics, the average production cost of acrylonitrile this week was 8808 yuan/ton, a month on month decrease of -1.44%. The average profit of acrylonitrile production during the same period was -558 yuan/ton, with a month on month increase of 74 yuan/ton.
Overall, there is ample supply, continuous shortage of spot buying gas combined with cost decline, and a lack of effective positive fundamentals to promote it. However, as the end of month settlement approaches, overall supplier offers remain stable, and the market deadlock is difficult to break. It is expected that the weakness will continue in the short term.