According to the price data from Shengyi Society, the polyester bottle chip market has been running weakly this week. As of September 5th, the average sales price of PET is 5897 yuan/ton. Decreased by 1.15% compared to the beginning of the week.
On the cost side: Crude oil prices have fallen this week, and the overall cost of polyester is weak and fluctuating. The collapse of cost support, coupled with downstream demand to maintain essential needs and replenish at low prices, has resulted in no substantial positive news on the supply and demand side, leading to an expansion of the decline in the PET market. The current situation presents a dual weak pattern of cost and demand, and the cost side has not provided strong support for the price of polyester bottle chips, which cannot drive price increases.
Supply side: Mainstream factories continue to reduce production, which provides some support for prices, but the buffering effect of supply regulation is limited, making it difficult to change the overall weak trend.
Demand side: Downstream demand is weak, with rigid procurement being the main focus. After the deep drop in prices on Thursday, some companies bought back their positions on dips, which slightly boosted trading and the overall market lacked the drive to increase volume.
Looking ahead to next week, the cost side is under pressure due to the expected poor quality of the “golden nine and silver ten” products, and the PET market price may fluctuate narrowly with the cost side in the short term. Terminals are often used and purchased on demand, and the market lacks the drive to increase volume. The actual trend still needs to pay attention to changes in external news, device changes, and demand recovery in the future. The price of bottle slices is expected to fluctuate weakly within the range of 5800-5950 yuan/ton.

1、 Price trend
According to the commodity analysis system of Shengyi Society, the price trend of soda ash has decreased this week. As of August 29th, the average market price of soda ash was 1210 yuan/ton, a decrease of 10 yuan/ton compared to the price of 1220 yuan/ton on August 25th, a decrease of 0.82%.
2、 Market analysis
The soda ash market has been weak this week. The utilization rate of soda ash production capacity decreased during the week, and the supply of soda ash weakened. Manufacturers are actively shipping; The downstream performance in terms of demand is average, with narrow fluctuations in the glass market and slow consumption of inventory by enterprises. There is insufficient support for soda ash, and some purchases are mainly seeking lower prices. The market trading atmosphere is poor, and soda ash prices are mainly weak. On August 29th, the price of light soda ash in East China was reduced by 30 yuan/ton, with a range of 1100-1400 yuan/ton; The price of light soda ash in central China remains at 1130-1300 yuan/ton.
According to the commodity analysis system of Shengyi Society, the downstream glass market has risen narrowly. From August 25th to 29th, the price of glass increased from 13.83 yuan/square meter to 13.88 yuan/square meter, an increase of 0.36%. The production line of the glass market is running smoothly, with increased inventory in enterprises and average downstream consumption. There is limited replenishment upon entering the market. As the traditional peak season approaches, some enterprises have slightly increased their quotations, and the glass price market remains weak.
Future forecast: Currently, the price of soda ash is running weakly and steadily, and the mentality of industry players is mainly wait-and-see. Downstream demand has not yet rebounded, and soda ash companies continue to have weak shipments. The fundamental supply-demand contradiction persists, and it is expected that the soda ash market will run weakly in the later stage. Specific attention should be paid to downstream follow-up situations.

According to the Commodity Market Analysis System of Shengyi Society, the domestic natural rubber spot market has been consolidating at a high level recently (8.25-9.1). As of September 1st, the spot rubber market in China’s natural rubber market was around 14958 yuan/ton, a decrease of 0.11% from 14975 yuan/ton on August 25th. Downstream tire production has fluctuated slightly, forming a strong demand support for Tianjian; On the other hand, the price of natural rubber raw materials remains strong, and the cost support of natural rubber continues; In addition, the slight decrease in domestic port inventory and the favorable market atmosphere have driven natural rubber prices to fluctuate and rise. As of September 1st, the mainstream price for 24 years of Guangken, Baodao, and Haibao latex in Qingdao area ranges from 14900 to 15150 yuan/ton.
As of September 1st, the price of Thai glue was 55.45 baht/kg, an increase of 0.36% from 55.25 baht/kg on August 25th. Recently, the main rubber production areas at home and abroad have been affected by rainfall and typhoons, resulting in lower than expected new rubber production and high raw material prices.
Recently (8.25-9.1), natural rubber inventories have continued to decrease slightly, and the market atmosphere has improved. As of August 31, 2025, the total inventory of Tianjiao bonded and general trade in Qingdao area was 602000 tons, a decrease of 0.4 million tons or 0.6% compared to the previous period.
Recently (8.25-9.1), there has been a slight consolidation in downstream tire production, providing strong support for the natural rubber market’s essential needs. As of August 29th, the construction of semi steel tires by domestic tire companies has slightly increased to around 7.5%; The production of all steel tires by tire companies in Shandong Province has slightly decreased to around 6.3%.
Market forecast: The current high domestic and international raw material prices, stable downstream tire production, and consolidation provide support for the Tianjin rubber market. The Tianjin rubber port inventory has slightly decreased, and with the arrival of the peak season, it is expected that the natural rubber market will fluctuate and rise in the later period.

According to the monitoring of the commodity market analysis system of Shengyi Society, the magnesium ingot market in Shaanxi Province slightly decreased this week (8.18-8.22), with an average market price of 17437 yuan/ton at the beginning of the week and 17400 yuan/ton at the end of the week, a decrease of 0.22%.
This week, the magnesium market experienced a brief and slight consolidation before gradually recovering, but overall prices have slightly decreased. The market supply and demand relationship is balanced, and the overall price remains stable.
Supply and demand side
In terms of supply, in the magnesium smelting industry, due to the current low inventory of enterprises, when magnesium prices experience a certain degree of decline, enterprises adopt different market response strategies. Among them, some companies choose to follow the market and ship in small quantities at current lower market prices to recoup funds or maintain market participation; On the other hand, some companies adhere to a pricing strategy based on optimistic expectations of future market trends or cost control considerations, choosing to stop shipping to avoid low-priced sales. The differentiation of this market behavior has led to significant resistance in the downward trend of magnesium prices, making it difficult to sustain the decline. At the same time, with the gradual increase in the number of market purchases, the supporting role of the demand side has become apparent, driving the rapid recovery of magnesium prices.
In terms of demand, the downstream market experienced a relatively concentrated procurement period last week, and the number of orders placed this week has decreased. The market trading atmosphere is slightly quiet, but as the weekend approaches, the market trading situation has rebounded.
Raw material end
Recently, the market has shown that coal prices have remained relatively stable, while orchid charcoal prices have slightly increased, silicon iron prices have remained stable, and overall costs have slightly decreased.
comprehensive analysis
During this year’s overseas summer break, the market continued to show a stable to strong trend, with prices gradually recovering to a relatively reasonable range and overall fluctuations being relatively small. This phenomenon indicates that the supply and demand pattern of the market has undergone fundamental changes, and the demand scale of the domestic market is sufficient to support the current market situation. Based on this, it is expected that the market will continue to maintain a stable tone and maintain a strong operating trend in the future.

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.