1、 Price trend

This week, the overall price of caustic soda is running strongly. The average market price from the beginning of the week to the weekend was around 639 yuan/ton, a year-on-year decrease of 23.38%. On September 23, the chlor alkali index was 735 points, unchanged from yesterday, a decrease of 65.46% from the highest point of 2128 points during the cycle (2021-10-24), and an increase of 3.96% from the lowest point of 707 points on February 27, 2026. (Note: The cycle refers to the period from December 1, 2011 to present)
2、 Market analysis
This week, the price of caustic soda has been operating strongly. The price of caustic soda in Shandong region is around 580-680 yuan/ton for 32% ion membrane alkali in the mainstream market. In Zhejiang region, the price of caustic soda is around 830-880 yuan/ton for 32% ion membrane alkali delivered to Xiaoshan mainstream market. The price of caustic soda in Inner Mongolia region is stable, and the mainstream market price of 32% ion membrane alkali is around 1850-1950 yuan/ton (converted to 100 yuan).
This week, the price of caustic soda lacked a positive boost, and the overall market was consolidating. The short-term fluctuations in the supply of liquid alkali in East China are limited, and there has been no significant improvement in domestic and foreign trade demand. Chlor alkali plants are controlling their inventory before the holiday and maintaining the current inventory level in multiple dimensions. The price of alumina is showing a fluctuating trend, and with the gradual release of the remaining new production capacity within the year, regional supply pressure continues to increase, and the pessimistic atmosphere in the market remains strong. It is expected that the price of alumina will fluctuate in the later period. Non aluminum downstream demand continues to increase through on-demand procurement.
Analysts believe that in recent times, the caustic soda prices have been consolidating this week, and downstream alumina suppliers in China have been purchasing on demand, with non aluminum companies receiving only average orders. Although there will be pre holiday stocking next week, caustic soda manufacturers will mainly hold existing inventory, and the comprehensive supply-demand game predicts that caustic soda may tend to fluctuate, depending on downstream market demand.