News and Articles

• Chinese caustic soda export and domestic prices held flat
• 32 percent solution domestic spot near 330 dollars per tonne equivalent
• China added 1.61 million tonnes of new caustic capacity in 2025
• Carbide PVC producers running flat out support indirect caustic balance
• European rationalization removes capacity at Fortischem Spolana Vencorex

China's caustic soda market held within a tight range as integrated chlor-alkali producers maintained operating rates to capitalize on relatively firm ethylene-route PVC pricing. The Chinese export caustic market has been a critical relief valve for buyers in Southeast Asia, the Middle East and South America, with annual export volumes of around 3.2 million tonnes in 2024. The average market price has remained flat compared to the start of the month, with 32 percent solution domestic spot prices near 330 dollars per tonne export equivalent and 99 percent flakes commanding a premium for export users in textiles, water treatment and alumina.

The supply side has been characterized by relative balance. Chinese chlor-alkali producers added 1.61 million tonnes of new caustic capacity in 2025 while phasing out 200,000 tonnes, leaving total capacity around 45 million tonnes per year. With chlorine and PVC demand soft due to weak real estate completions, integrated producers have throttled chlorine output and have therefore reduced caustic co-production, supporting prices despite the underlying capacity overhang. Carbide-route PVC producers continue to run at full capacity to capture margins from the ethylene-route shortage created by the Hormuz disruption, and that has indirectly supported caustic balances.

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Global flows have been reshaped by ongoing structural changes. India recently cancelled the BIS requirement that had restricted US PVC imports, and that opening is expected to redirect some US export caustic flows as well, since the chlor-alkali coproduction relationship ties North American chlorine demand to PVC pull. European chlor-alkali rationalization continues with Fortischem, Spolana, Vencorex and Arkema Jarrie closures already removed from the system, and Vynova's 225,000 tonne per year PVC shutdown at Beek finalized in November 2025. Dow's planned exit from Schkopau by 2027 signals further European caustic capacity reduction.

Procurement teams covering alumina refining, pulp and paper, textiles, water treatment, soap and detergent applications should track three signals into Q3. First, any reopening of the Strait of Hormuz that releases trapped Middle Eastern PVC and EDC supply would compress ethylene-route PVC margins in China and trigger caustic production reshuffling. Second, US PVC export competitiveness into India will reset North American chlorine demand and caustic availability for spot buyers. Third, European industrial activity recovery, particularly in alumina and pulp sectors, will determine whether the structural caustic tightness developed during early 2025 force majeures persists. Buyers with index-linked contracts should benchmark against multiple regional caustic indices to avoid being whipsawed by region-specific dislocations.