China Flake Caustic Soda Market Update: Solid Prices Hold as Supply Tightens

China's flake caustic soda market remained stable in the week of May 15-21, 2026, even as the broader chlor-alkali sector faced lower operating rates and softer liquid caustic soda pricing. For overseas importers, planned maintenance and reduced production may become more important than short-term price declines when arranging near-term supply.

Key Market Takeaways

• Northwest China 98% solid flake caustic soda held at RMB 2,450/MT week on week.
• Shandong 32% liquid caustic soda averaged RMB 605/MT for the week, down 0.82% from the prior week.
• Shandong 50% liquid caustic soda averaged RMB 1,022/MT, down 0.78% week on week.
• Average utilization among surveyed Chinese caustic soda producers fell to 79.8%, down 1.3 percentage points.
• Surveyed liquid caustic soda factory inventory totaled 565,600 wet MT on May 21, down 1.17% week on week but up 36% year on year.

Supply Conditions in China

Production declined during the week as additional chlor-alkali units underwent maintenance or operated at reduced loads. Weekly output among the surveyed producers was approximately 803,000 MT. Further maintenance was scheduled for the following week, with national utilization projected near 79.1%.

For buyers of solid caustic soda, reduced chlor-alkali operating rates can limit readily available supply even when flake prices appear stable. Buyers planning prompt shipment should confirm production schedules, packing availability, and loading windows early.

Demand and Price Direction

Downstream demand remained selective. Alumina procurement was largely need-based, while resistance to higher liquid alkali offers placed pressure on some Shandong transactions. Liquid chlorine prices also declined, reducing chlor-alkali margins and limiting producer flexibility.

In the short term, low-concentration liquid alkali prices in Shandong may find support from maintenance-related supply reductions. Solid flake caustic soda pricing is expected to remain closely tied to new order activity and producer inventory levels.

What Import Buyers Should Monitor

• Maintenance and restart schedules at major chlor-alkali plants.
• Availability of export packing and shipment space for flake material.
• Changes in Shandong liquid caustic soda prices as an indicator of broader market sentiment.
• Updated supplier offers before confirming purchase quantities or delivery timing.

Frequently Asked Questions

Was solid flake caustic soda cheaper during the week?

No. The referenced northwest China price for 98% flake caustic soda remained unchanged at RMB 2,450/MT during the week ended May 21, 2026.

Why should overseas buyers monitor plant operating rates?

Lower operating rates and planned maintenance can reduce near-term supply availability and affect delivery schedules, even when weekly solid product prices remain stable.

Where can buyers review the related product?

See our Caustic Soda Flakes page for product information and sourcing inquiries.

Data note: This original market summary was prepared from weekly China market figures supplied for May 15-21, 2026. Figures are for market reference and should be reconfirmed when requesting a current quotation.