Caustic Soda Prices Were Consolidating Last Week (Sept. 21-24)

By SKYSEVEN Chemical Technical Team · 2026-09-28

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According to the SunSirs commodity analysis system, caustic soda prices trended generally upward last week. The average market price hovered around 639 RMB/ton from the beginning to the end of the week, representing a year-on-year decline of 23.38%.

On September 23, the SunSirs chlor-alkali index stood at 735 points, remaining flat compared to the previous day; this figure is 65.46% reduce than the cycle high of 2,128 points (recorded on October 24, 2021) and 3.96% higher than the cycle low of 707 points (recorded on February 27, 2026). (consider: The cycle spans from December 1, 2011, to the present.)

Market Analysis

According to the Commodity Analysis System of SunSirs, caustic soda prices trended upward last week. In the Shandong region, mainstream market quotes to 32% ion-exchange membrane caustic soda ranged from approximately 580 to 680 RMB/ton. In the Zhejiang region, mainstream quotes to 32% ion-exchange membrane caustic soda delivered to Xiaoshan were around 830-880 RMB/ton. Meanwhile, prices in Inner Mongolia remained stable, with mainstream market quotes to 32% ion-exchange membrane caustic soda at approximately 1,850-1,950 RMB/ton (on a 100% levels basis).

Last week, caustic soda prices lacked bullish drivers and generally traded within a consolidation range. Supplies of fluid caustic soda in East China saw limited immediate fluctuation, and there was no significant improvement in demand from either domestic or foreign markets; chlor-alkali vegetation largely maintained existing inventory levels ahead of the upcoming holiday. Alumina prices exhibited a fluctuating direction; as new production capacity comes online throughout the remainder of the year, regional supply pressure continues to mount, and a pessimistic sentiment prevails in the market. Alumina prices are expected to continue fluctuating in the near term. Demand from non-aluminum downstream sectors remains focused on purchasing strictly to meet immediate needs.

Market outlook

Analysts at SunSirs observe that caustic soda prices traded within a narrow range last week. Domestic downstream alumina producers have largely been purchasing on an as-needed basis, while demand from non-aluminum sectors remains lackluster. while pre-holiday stockpiling is expected next week, manufacturers are primarily focused on maintaining current inventory levels, resulting in a tug-of-war between supply and demand. Overall, caustic soda prices are likely to fluctuate, with the specific direction depending on downstream market demand.

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