This week, the price of isooctanol fluctuated and fell

According to the Commodity Market Analysis System of Shengyi Society, as of September 15th, the price of isooctanol was 7016.67 yuan/ton, a fluctuating decrease of 0.71% compared to the price of 7066.67 yuan/ton on September 8th. This week, the production capacity of isooctanol enterprises remained stable at a high level, and the operating rate of isooctanol equipment slightly increased to 96%. In addition, there was a significant increase in new isooctanol production capacity, resulting in an increase in isooctanol supply; Downstream plasticizer companies have stable production, but the demand support for isooctanol by plasticizers is limited. The increase in supply and demand support is limited, and the price of isooctanol has fluctuated and fallen.
Downstream plasticizer DOP prices stop falling and rebound
According to the Commodity Market Analysis System of Shengyi Society, as of September 15th, the DOP price was 7509.16 yuan/ton, a fluctuating increase of 0.56% compared to the DOP price of 7467.50 yuan/ton on September 10th. DOP prices have rebounded and stopped falling, while DOP enterprises have increased their operating load. The demand for isooctanol has increased, and the support for the rise in isooctanol prices still exists.
Future expectations
According to the data analyst of Business Society’s octanol product, on the supply side, the equipment operating load of isooctanol enterprises remains stable at a high level, coupled with a large amount of new production capacity of isooctanol, resulting in an oversupply of isooctanol. In terms of demand, DOP prices have rebounded and stopped falling, while support for isooctanol demand still exists. In the future, with the increase in supply and demand support of isooctanol, it is expected that the price of isooctanol will fluctuate and stabilize.

According to the Commodity Market Analysis System of Shengyi Society, the TDI market in East China has stopped falling and risen this week. As of September 12th, the average market price in East China was 13866 yuan/ton, and on September 8th, the average price was 13666/ton, with a weekly increase of 1.46% and a year-on-year increase of 1.22%.

This week, the TDI market has stopped falling and rebounded. During the week, there were frequent positive news from suppliers, with large northern factories offering a 20% discount on supply, resulting in tight supply. The guidance price for major factories in Shanghai has been raised to 14200 yuan/ton due to tight inventory. The news has boosted the confidence of industry players, and intermediary quotes have been raised. Downstream demand is dominant, with low enthusiasm for entering the market, accompanied by price increases, resulting in sluggish transactions.
Supply side: The Yantai Wanhua TDI plant will be shut down for maintenance starting from August 19th, with an expected maintenance period of about 40 days. Other devices maintain stable operation.
Cost wise: The overall toluene market is weak, with average market transactions and limited guidance on news, creating a strong wait-and-see atmosphere.
In terms of future market analysis, the TDI data analyst from Shengyi Society believes that the current TDI market has a high atmosphere of supply side price support, but the demand side support is limited. The market will closely monitor changes in supply and demand, as well as news segments. In the short term, downstream market entry enthusiasm is not high, and it is expected that the TDI market will digest the increase and organize its operation.

The price of plasticizer DOP fluctuated and fell in September

According to the Commodity Market Analysis System of Shengyi Society, as of September 8th, the DOP price was 7517.50 yuan/ton, a fluctuating decrease of 0.94% compared to the DOP price of 7589.17 yuan/ton on September 1st. The prices of raw materials isooctanol and phthalic anhydride have fluctuated and fallen, leading to a decrease in DOP costs and increased downward pressure on DOP; In September, the start-up load of DOP enterprises stabilized, and the supply of DOP was sufficient; Downstream demand is difficult to improve, and there is a lack of interest in DOP procurement inquiries, resulting in limited improvement in DOP demand transactions. Supply increases, costs decrease, and plasticizer prices fluctuate and fall.
The price of raw material isooctanol fluctuated and fell in September
According to the Commodity Market Analysis System of Shengyi Society, as of September 8th, the price of isooctanol was 7283.33 yuan/ton, a fluctuating decrease of 3.32% compared to the price of 7533.33 yuan/ton on August 1st. In September, the isooctanol enterprise’s equipment remained stable at a high level, with a 95% operating rate of isooctanol equipment. In addition, there was a significant increase in isooctanol production capacity, resulting in an increase in isooctanol supply; The operating load of downstream plasticizer enterprises is temporarily stable, and the demand support for isooctanol by plasticizers is limited. Due to increased supply and limited demand support, the price of isooctanol fluctuated and fell in September. The cost of plasticizers has decreased, and the downward pressure on DOP has increased.
The price of raw material phthalic anhydride fluctuated and fell in September
According to the Commodity Market Analysis System of Shengyi Society, as of September 8th, the price of phthalic anhydride in neighboring countries was 6133.33 yuan/ton, a fluctuation of 2.65% compared to the price of 6300 yuan/ton on September 1st. In September, the price of phthalic anhydride rebounded and rose, while the price of industrial naphthalene stabilized. The cost support for phthalic anhydride increased, and the load of phthalic anhydride equipment stabilized in September. The operating rate of phthalic anhydride enterprises was 60%, and the supply of phthalic anhydride was stable. The operating load of downstream plasticizer enterprises’ equipment was temporarily stable, and the demand support for phthalic anhydride was limited. It is expected that the price of phthalic anhydride will rebound and rise in the future, the cost of plasticizers will stop falling, and the downward pressure on the price of plasticizer DOP will weaken.
Future expectations
According to the data analyst of Shengyi Society’s plasticizer products, in terms of cost, the price of isooctanol has fluctuated and fallen, while the price of phthalic anhydride has rebounded and risen. The downward pressure on the cost of plasticizer DOP still exists; In terms of supply, the operating rate of plasticizer enterprises is consolidated, the production of plasticizers is stable, and the supply of plasticizers is sufficient; In terms of demand, the overall economy is sluggish, coupled with anti competition and the elimination of outdated production capacity, resulting in weak downstream demand. In the future, with strong supply and weak demand, coupled with the pressure of cost decline, it is expected that the price of plasticizer DOP will fluctuate and fall.

According to the Commodity Market Analysis System of Shengyi Society, from September 1st to 5th, the domestic aggregated MDI market experienced a slight decline, with an average price of 15250 yuan/ton at the beginning of the week and 15083 yuan/ton at the end of the week, a decrease of 1.09% during the period and a year-on-year decrease of 15.58%. The factory started operating steadily within the week, but the downstream market enthusiasm was not high, resulting in low transaction volume.

On the supply side, the 80000 tons/year MDI plant in Dongcao Rui’an restarted on August 26th and the plant has returned to normal.
On the cost side, pure benzene fluctuated this week. Recently, pure benzene ports have been destocked, import pressure has eased, domestic maintenance and downstream demand have increased, and supply and demand are expected to improve seasonally in the third quarter. Aniline prices are temporarily stable.
On the demand side, downstream demand is average, the trading atmosphere is quiet, and transactions are mainly small orders.
Future forecast: Currently, the supplier’s production is stable, the source of goods is filling up quickly, the intermediary’s goods are not smooth, and the market inventory pressure is increasing. It is expected that the aggregated MDI market will maintain a weak trend in the short term.

According to the Commodity Market Analysis System of Shengyi Society, formic acid has shown a fluctuating trend recently. As of September 1st, the benchmark price of 85% industrial grade formic acid Shengyi Society was 3353 yuan/ton, up 25.59% month on month and 25.75% year-on-year.

The arrival of the “golden nine and silver ten” on the demand side may lead to positive downstream expectations
The pressure on foreign trade supply has eased, and the volume of export orders has shrunk month on month. From the perspective of the domestic market, the “Golden September and Silver October” are approaching, and downstream industries such as pharmaceuticals are gradually recovering, which may increase the demand for formic acid. However, the current formic acid price is at a high point this year, and terminal purchasing intentions are becoming cautious.
Large factories have maintenance plans, and inventory pressure may be alleviated
According to market news, a large factory in Liaocheng plans to carry out equipment maintenance this month. As a result of this expectation, the high inventory of formic acid is expected to ease, and prices may rise.
According to the data analyst of Shengyi Society, the price of formic acid is expected to rise due to multiple favorable factors.

According to the Commodity Market Analysis System of Shengyi Society, the toluene market experienced a volatile decline in August 2025. From August 1st to 29th, the domestic toluene market price fell from 5570 yuan/ton to 5440 yuan/ton, with a price drop of 2.33% during the period.

In the first half of this cycle, the toluene market experienced narrow fluctuations with relatively small overall volatility. This week, some enterprises in the Shandong market are temporarily not exporting for personal use, and the export enterprises are mainly based on pre-sales. Refinery quotations are generally stable. The East China market is mixed with negative and positive factors, and the market is temporarily stable under the mentality of supply and demand game. Although the supply in the South China region is slightly tight, the weakening of crude oil prices has dragged down market sentiment, and the overall market performance remains stable.
Late month: Due to poor sales at the end of the month in Shandong, the listing prices continued to decrease, but downstream purchasing intentions were generally low and weak. The overall performance of the demand side is still weak, although the upstream actively reduces prices, the downstream’s enthusiasm for entering the market is low, and the market is overall declining, with limited negotiations.
Cost wise: As of the 26th, the settlement price of the October WTI crude oil futures contract in the United States was $63.25 per barrel, and the settlement price of the October Brent crude oil futures contract was $67.22 per barrel. During this round of price adjustment cycle, crude oil prices were mainly volatile. On the one hand, OPEC+announced a cumulative increase in production of 2.3 million barrels per day by September, marking the organization’s exit from its plan to reduce production by over 2.2 million barrels per day one year ahead of schedule. This news is bearish for the oil market. On the other hand, the tense situation in Europe and the upcoming peace talks have led to a weakening of geopolitical supply risks, negative global macro data, and the expectation of the Federal Reserve’s interest rate cut in September, making it difficult for the crude oil market to have positive support.
Supply side:
Sinopec’s toluene enterprise is operating normally, with stable production of equipment and many products for personal use, resulting in stable production and sales. As of August 29th, East China Company quoted 5450 yuan/ton, North China Company quoted 5300 yuan/ton, South China Company quoted 5550-5600 yuan/ton, and Central China Company quoted 5550 yuan/ton.
Demand side:
According to the Commodity Market Analysis System of Shengyi Society, as of August 29, 2025, the price of xylene by Sinopec Sales Company has temporarily stabilized, with a current execution price of 7200 yuan/ton. This price is being implemented in East China, North China, Central China, and South China. Yangzi Petrochemical, Zhenhai Petrochemical and other facilities are operating stably and selling normally, with a price reduction of 50 yuan/ton compared to July 30. As of August 28th, the closing prices of the xylene market in Asia were $822-824/ton FOB Korea and $847-849/ton CFR China, a decrease of 19 yuan/ton from July 30th.
Market forecast: The overall performance of the toluene market is weak in the near future, and there is a strong game mentality between supply and demand. With some toluene enterprises resuming operations, the market supply is relatively loose in the near future. The demand side is approaching the traditional peak season of “golden September and silver October”, and downstream stocking demand may increase to some extent. In the short term, the toluene market is expected to have a weak trend due to loose supply in the future. In the long run, demand during peak seasons may drive an upward trend in the market. In the future, we will focus on the trend of crude oil and downstream enterprise production.

According to the Commodity Market Analysis System of Shengyi Society, the domestic PTA market rebounded after a decline in August, with an average price of 4891 yuan/ton in the PTA market in East China, an increase of 1.45% from the beginning of the month. In the first ten days, OPEC+increased production, crude oil continued to decline, and market prices fell due to expectations of self accumulation. In the second half of the year, the petrochemical industry experienced a rebound and PTA units suffered unplanned losses, leading to a significant increase in market prices. At the end of the month, concerns about weakened supply and demand led to a sharp decline in market prices from high levels.

In terms of PTA supply, some factories have undergone equipment maintenance, and the industry’s operating rate is around 68%, but the market supply is stable and there has been no shortage of goods. In early September, three sets of PTA plants with capacities of 2.25 million tons, 2.2 million tons, and 4.5 million tons will be restarted one after another, and the supply and demand of the industry will shift from destocking to loose balance.
The crude oil market is intertwined with long and short factors, and will continue to face complex situations in the short term. On the supply side, the geopolitical risks between Russia and Ukraine have escalated due to Trump’s deadline for negotiations, raising concerns about supply disruptions. On the demand side, both US crude oil inventories and Cushing crude oil inventories have decreased, while strategic petroleum reserve inventories have increased, providing support for oil prices. However, the implementation of US tariffs on India’s purchase of Russian crude oil may be hindered. As of August 26th, the settlement price of the October WTI crude oil futures contract in the United States was $63.25 per barrel, and the settlement price of the October Brent crude oil futures contract was $67.22 per barrel. The future still needs to focus on the progress of the Russia Ukraine situation and the policy guidelines of the OPEC meeting on September 7th.
The operating rate of downstream polyester industry has slightly rebounded, and PTA is mostly purchased at low prices. In previous years, with the gradual issuance of autumn and winter orders and the start of the “Golden September” peak season, demand is expected to gradually increase. However, since the beginning of this year, tariff disputes have persisted, affecting the export of terminal textiles and clothing, and the launch of the “Golden September” has been delayed. Most textile companies are cautious and cautious, focusing on maintaining essential procurement.
Business analysts believe that the supply of PTA maintenance equipment will return in September, and the maintenance is still uncertain. On the demand side, the market expects the traditional peak season in September to inject a stimulant into the market. However, in the absence of clear direction guidance, short-term PTA prices are expected to follow fluctuations in crude oil prices.

According to the Commodity Market Analysis System of Shengyi Society, as of the 25th, the price of ethyl acetate was 5386.67 yuan/ton, a decrease of 0.68% compared to the price of 5423.33 yuan/ton on August 18th, and a decrease of 1.10% from the beginning of the month. The supplier’s inventory has slightly increased, downstream demand continues to be weak, market transactions are average, and the ethyl acetate market continues to operate weakly.

The utilization rate of domestic ethyl acetate production capacity has slightly increased, and the market inventory has increased. Enterprises maintain active shipment, but downstream market entry enthusiasm is not high. A small amount of low-priced purchases are sought, and market consumption inventory is limited. The domestic acetic acid on the raw material side has fluctuated, and cost support is insufficient. Enterprises follow the market, and the price of ethyl acetate is weak and fluctuating.
In the future, the shipment of ethyl acetate enterprises is average, downstream demand consumption is slow, and the market fundamentals are weak. Recently, some areas of raw material acetic acid have been operating strongly, which has boosted the mentality of ethyl acetate. It is expected that the short-term market for ethyl acetate may rise slightly, and specific attention should be paid to changes in supplier equipment and downstream follow-up.

This week, the price of plasticizer DOP has stopped falling and rebounded

According to the Commodity Market Analysis System of Shengyi Society, as of August 25th, the DOP price was 7759.16 yuan/ton, which first fell and then rose compared to the DOP price of 7759.16 yuan/ton on August 15th. This week, the operating load of DOP enterprises has slightly decreased, the production of plasticizers has remained stable, and downstream demand is unlikely to improve. The intention of DOP procurement inquiries is flat, and the improvement in DOP demand transactions is limited. The price of raw material isooctanol fluctuated and fell, the price of phthalic anhydride fluctuated and rose, and the cost support of plasticizers slowed down. The stable supply has led to a decrease in costs, and the price of plasticizers has stopped falling and stabilized this week.
This week, the price of raw material isooctanol fluctuated and fell
According to the Commodity Market Analysis System of Shengyi Society, as of August 25th, the price of isooctanol was 7316.67 yuan/ton, a fluctuating decrease of 0.81% compared to the price of 7376.67 yuan/ton on August 15th. The production of isooctanol equipment resumed in August, and the operating rate of isooctanol equipment increased to 92% this week. In addition, with the addition of new production capacity and increased supply of isooctanol, the price of isooctanol fluctuated and fell this week; The cost of plasticizers has decreased, and the downward pressure on DOP has increased.
This week, the price of raw material phthalic anhydride has stopped falling and risen
According to the Commodity Market Analysis System of Shengyi Society, as of August 25th, the price of phthalic anhydride in neighboring countries was 6333.33 yuan/ton, which first decreased and then increased compared to the price of 6300 yuan/ton on August 15th, with an increase of 0.53%; Compared to the price of 6233.33 yuan/ton quoted on August 20th, the price of ortho benzene has fluctuated and increased by 1.60%. The price of ortho benzene is stabilizing, the price of industrial naphthalene is rising, the cost of phthalic anhydride is increasing, the operating rate of phthalic anhydride equipment is consolidating at a low level, and the cost increase combined with weak supply and demand has led to a rebound in phthalic anhydride prices this week. The price of raw material phthalic anhydride has risen, and the cost of plasticizers has increased. This week, the downward pressure on the price of plasticizer DOP has weakened.
Future expectations
According to the data analyst of Shengyi Society’s plasticizer products, in terms of cost, the price of isooctanol has fluctuated and fallen, while the price of phthalic anhydride has rebounded and risen, and the cost of plasticizer DOP has stopped falling; On the supply side, the operating capacity of plasticizer enterprises has slightly decreased, the production of plasticizers has remained stable, and the supply of plasticizers is sufficient; In terms of demand, the overall economy is sluggish, coupled with anti competition and the elimination of outdated production capacity, resulting in weak downstream demand. Overall, the weak supply and demand, coupled with the stabilization of costs, are expected to lead to a consolidation of the price of plasticizer DOP in the future.

1、 Price trend

According to the commodity analysis system of Shengyi Society, the price of caustic soda has risen this week. The average market price at the beginning of the week was 860 yuan/ton, and the average market price over the weekend was 862 yuan/ton, with a price increase of 0.23% and a year-on-year increase of 7.08%. On August 21st, the Business Social Chemical Index was 771 points, unchanged from yesterday, a decrease of 44.93% from the highest point of 1400 points during the cycle (October 23, 2021), and an increase of 28.93% from the lowest point of 598 points on April 8, 2020. (Note: The cycle refers to the period from December 1, 2011 to present)
2、 Market analysis
According to the commodity analysis system of Shengyi Society, the price of caustic soda increased over the weekend this week. The price of caustic soda in Shandong region is around 800-890 yuan/ton in the mainstream market of 32% ion-exchange membrane alkali. The price of caustic soda in Jiangsu region is stable, with a mainstream market price of 870-930 yuan/ton in 32% ion-exchange membrane alkali. The price of caustic soda in Inner Mongolia region is stable, with a mainstream market price of 2700-2800 yuan/ton (converted to 100%) in 32% ion-exchange membrane alkali. From the perspective of Shandong region, the price of caustic soda remained stable during the week, with a slight increase over the weekend. The pre maintenance equipment has not been restored yet, and the inventory pressure of the enterprise is not high. The prices of liquid alkali purchased by major downstream enterprises have increased, and the prices of liquid alkali in the region have risen. Alumina is mostly purchased on demand, while non aluminum receiving is mainly purchased on demand.
Business Society analysts believe that in the near future, the price of caustic soda has slightly increased and is operating steadily. Domestic downstream demand is still acceptable, and inventory pressure for caustic soda enterprises is not high. Downstream inventory enterprises are expected to undergo maintenance, and the comprehensive supply-demand game predicts that caustic soda will maintain a strong operating market in the later stage, depending on downstream market demand.