China Caustic Soda Market Update: Lower Operating Rate Supports Liquid Alkali as Supply Recovery Approaches

China's caustic soda market showed modest regional strength during August 13-20, 2026, as maintenance and temporary operating-rate reductions tightened supply in several production areas. Shandong's weekly average for 32% liquid caustic soda was RMB 631/mt on a wet-ton basis, up 0.3% week on week, while the national operating rate for surveyed producers with at least 100,000 mt/year of capacity fell to 76.0%. For overseas buyers, these domestic indicators are useful for understanding the supply direction, but they are not direct export quotations for solid caustic soda.

Key Takeaways for Overseas Buyers

Shandong 32% liquid caustic soda closed at RMB 635/mt on August 20, equivalent to approximately USD 93/mt using the fixed working exchange rate of USD 1 = RMB 6.8. The weekly average was RMB 631/mt, also about USD 93/mt. Shandong 50% liquid caustic soda closed at RMB 1,010/mt, approximately USD 149/mt. These are domestic wet-ton market references; current export RFQs for solid NaOH must be reconfirmed according to grade, packing, quantity, destination port, freight and shipment window.

Solid caustic soda moved slightly higher in major production areas. Northwest China 98% flakes reached RMB 2,210/mt on August 20, around USD 325/mt at the same working exchange rate. This domestic reference should not be treated as a ready FOB or CIF offer because export packing, inland transport, documentation and ocean freight must be calculated separately.

Supply, Operating Rate and Inventory

China's weekly caustic soda output from the surveyed producer group declined to approximately 768,000 mt, down about 11,000 mt from the previous week. The average capacity utilization rate fell by 1.1 percentage points to 76.0% as five chlor-alkali units underwent maintenance, three units restarted and some plants temporarily reduced operating rates.

Fixed liquid caustic soda inventory among surveyed producers with at least 200,000 mt/year of capacity was about 483,900 wet mt as of August 20. Inventory decreased 4.31% week on week but remained 22.07% higher year on year. The combination of lower weekly supply and falling inventory helped support some regional prices, although the high year-on-year inventory level still calls for cautious purchasing decisions.

Regional conditions differed. Shandong low-concentration liquid alkali received support from delayed restarts and reduced operating rates, while East China remained generally stable because maintenance-related supply reductions were offset by limited improvement in non-alumina demand. South China buyers continued mainly with contractual and essential purchases, and Northwest China maintained external shipments of higher-concentration alkali while regional inventory increased.

Demand and Short-Term Market Direction

Alumina remained the principal downstream demand sector. Weekly alumina output increased, but many plants showed limited interest in spot purchasing beyond essential replenishment. Viscose staple fiber operating rates also improved, with buying still largely based on immediate production needs. These conditions suggest that demand is steady rather than strongly expansionary.

For the coming week, planned restarts may lift the national chlor-alkali operating rate to around 77.6%. In Shandong, the operating rate may recover more noticeably as maintenance ends. Producers are also approaching month-end inventory management, so low-concentration liquid caustic soda prices may have limited room to rise even if local inventories remain controlled. The market should be monitored for plant restart progress, liquid chlorine price movements and alumina purchasing volumes.

Implications for Solid Caustic Soda Procurement

International buyers comparing a China supplier, manufacturer, distributor or exporter should distinguish liquid alkali indicators from the actual export products they require. Caustic Soda Flakes and Caustic Soda Pearls are solid forms with separate production, packing and logistics considerations. Domestic 32% or 50% liquid prices cannot be converted directly into a solid-product export offer.

A practical RFQ should state the required NaOH specification, physical form, application, packing, order quantity, destination port and shipment window. Buyers should also request the relevant COA and MSDS before confirming a container shipment. Packaging and moisture protection are important because solid caustic soda is hygroscopic and corrosive.

RFQ Checklist

Include the product form (flakes or pearls), target NaOH purity, intended industrial application, bag size, pallet requirement if any, total quantity, destination port, required shipping period and document requirements. If the destination country has particular labeling, pallet or import-document rules, include them at the quotation stage.

Short FAQ

Did China's caustic soda market rise this week?

Shandong 32% and 50% liquid caustic soda prices increased slightly, while Northwest China caustic soda flakes also moved higher. Regional performance was mixed, and the expected recovery in plant operating rates may limit further increases.

Can buyers use the Shandong liquid caustic soda price as a flakes quotation?

No. The Shandong figures refer to domestic liquid product on a wet-ton basis. A flakes or pearls export quotation must account for solid-product specification, packing, inland logistics, export documentation and ocean freight.

What is the key supply indicator for next week?

The main indicator is the pace of chlor-alkali plant restarts. The surveyed national operating rate is expected to recover from 76.0% toward approximately 77.6%, subject to actual maintenance schedules.

What documents should be requested before shipment?

Buyers should review the product specification, COA and MSDS, together with packing, labeling and shipment documentation requirements.

Procurement Note

Jinan ZZ International Trade Co., Ltd. supports overseas buyers reviewing solid caustic soda specification, export packing, COA/MSDS and container shipment arrangements from China. Buyers can compare the linked flakes and pearls product pages and send an RFQ with quantity, destination port and shipment window for a current quotation.