Market evolution: Caustic soda and potash (CN 2815) — 2015–2025

Introduction

This report examines the evolution of EU external trade in products classified under Combined Nomenclature code 2815, which covers sodium hydroxide (caustic soda), potassium hydroxide (caustic potash), and peroxides of sodium or potassium. Over the 2015–2025 period, the EU's trade in these essential industrial chemicals underwent significant structural shifts driven by energy-price shocks, changing trade relationships, and evolving competitive dynamics within the chlor-alkali sector. Despite an overall expansion in trade values, the underlying story is one of price effects far outpacing volume growth, a marked geographic reorientation of partner countries, and the lasting imprint of the 2022 energy crisis. The scope and definitions section details the product hierarchy and its sub-headings.

1. Value Expansion Far Outpacing Volume: A Market Led by Prices

1.1 Export values nearly doubled while volumes grew only 42%

Between 2015 and 2025, the EU's extra-EU exports of CN 2815 products rose from €180.2 million to €355.8 million, an increase of 97.5%. Over the same period, export volumes grew more modestly, from 788,399 tonnes to 1,120,591 tonnes (+42.1%). The gap between value and volume growth is accounted for by a 38.9% increase in average export unit values, which rose from €229/t to €317/t. The peak export value reached €659.8 million, occurring in the same year as the peak unit price of €536/t — both in 2022, as discussed further below.

1.2 Import values rose even faster, driven by a steeper price surge

EU imports from non-EU countries grew from €247.7 million to €435.6 million (+75.9% in value), but import volumes increased by only 9.7% (from 1.37 million tonnes to 1.51 million tonnes). Average import unit values climbed 60.3%, from €181/t to €289/t. The value peak was dramatically higher: €1,022.8 million in 2022, when the average import price reached €503/t — nearly three times the 2015 level. This peak year saw import volumes of 2.03 million tonnes, still below the all-time volume high of 2.42 million tonnes recorded in 2018, underscoring how heavily the 2022 value spike was driven by unit prices rather than quantities.

1.3 EU production volumes contracted while domestic values doubled

The EU's own production volumes declined by 19.5% over the period, falling from 8.57 billion kg of NaOH equivalent (in 2015) to 6.90 billion kg (in 2025). Meanwhile, production values rose by 102.6%, from €1.62 billion to €3.28 billion. This divergence — shrinking output at sharply higher prices — mirrors the trade data and reflects the energy-intensive nature of chlor-alkali production, where electricity costs are a dominant input. The EU's trade intensity (extra-EU trade as a share of production plus net imports) increased from 16.6% to 21.3%, while export propensity remained essentially flat at around 10.5%.

1.4 Liquid caustic soda dominates volumes, peroxides command the highest unit prices

The product segment breakdown reveals that CN 281512 (caustic soda in aqueous solution) overwhelmingly dominates both import and export flows, accounting for 93% of import volumes and 85% of export volumes in 2025. Its import price trajectory illustrates the broader market dynamics: unit prices rose from €158/t in 2015 to a peak of €451/t in 2022 before settling at €262/t in 2025.

CN 281530 (peroxides of sodium or potassium) remains a negligible-volume product but commands extraordinary unit prices (€3,915/t in imports and €16,758/t in exports in 2025), reflecting its specialty-chemical character.

2. Geographic Reorientation: The Rise of the US, the Reversal with the UK, and Growing Import Concentration

2.1 The United States became the EU's dominant import supplier

The most striking partner-country shift was the surge in imports from the United States. US-origin imports rose from €53.6 million in 2015 to €210.7 million in 2025, an increase of 293.4%. At their peak, they reached €315.1 million. This growth likely reflects the cost advantage enjoyed by US chlor-alkali producers, who benefit from substantially lower natural gas and electricity prices driven by the shale gas revolution, making US exports increasingly competitive on the European market.

2.2 The United Kingdom shifted from a major import source to an export destination

Imports from the United Kingdom fell by 69.1%, from €69.8 million to €21.5 million, with highly volatile year-on-year swings (coefficient of variation of 0.72). Conversely, exports to the UK surged by 232.0%, from €20.5 million to €68.2 million. This reversal is consistent with the post-Brexit trade landscape: the UK, formerly integrated in the EU single market for these products, now trades with the EU as a third country, and the EU has shifted from being a net importer from the UK to a net exporter. The volatility in UK trade flows (with import values swinging from €138.8 million at peak to €11.4 million at trough) underscores the disruption caused by the transition to a new customs regime.

2.3 EU exports diversified toward neighbouring and Balkan markets

On the export side, the most striking growth was in exports to Switzerland (+630.1%, from €7.8 million to €56.9 million), Norway (+174.6%), and Serbia (+99.6%). Exports to the United States remained relatively flat (+3.2%), while those to Türkiye nearly doubled (+97.2%). Bosnia and Herzegovina remained a stable destination with modest growth (+8.8%) but notably low volatility (CV of 0.22), suggesting a mature, steady trade relationship. Exports to Serbia exhibited the lowest volatility of all major partners (CV of 0.096), highlighting the consistency of Balkan market demand.

2.4 Import-side concentration rose markedly while export markets remained diffuse

The Herfindahl-Hirschman Index (HHI) for imports by value rose from 2,216 to 3,025 (+36.5%), indicating a significant increase in supplier concentration. By volume, the HHI climbed from 2,560 to 3,423. These levels place EU caustic soda imports in a moderately concentrated range, and the trend raises concerns about supply-chain resilience, particularly given the growing dominance of the United States.

Export-side concentration remained far lower and grew only marginally, consistent with the EU serving a broad array of neighbouring and global markets. Within the EU, production is concentrated in Germany (31.4% of EU production share, RCA of 1.48) and Belgium (15.8% production share, RCA of 1.86), with Hungary (RCA 1.83), Romania (RCA 1.29), and Latvia (RCA 1.17) also showing revealed comparative advantage.

2.5 Germany emerged as a major extra-EU exporter while the Netherlands retrenched

Among EU member-state exporters, Germany posted the most dramatic growth, with extra-EU exports surging 897.1% from €7.4 million to €74.0 million. France (+325.0%, from €10.6 million to €44.9 million) and Belgium (+116.6%, from €43.5 million to €94.2 million) also expanded strongly. In contrast, the Netherlands — the second-largest exporter in 2015 at €45.4 million — saw its extra-EU exports decline by 32.1% to €30.8 million, suggesting a possible loss of competitive position or a reorientation of trade flows through other EU ports.

3. The 2022 Energy Crisis as a Structural Turning Point

3.1 Caustic soda prices spiked far beyond volumes in 2022

The year 2022 stands out as an extreme price shock year for EU trade in CN 2815. Import values surged to €1,022.8 million — more than double the 2021 level — while import volumes (2.03 million tonnes) actually remained below the 2018 peak (2.42 million tonnes). For liquid caustic soda (281512), the most traded sub-product, the import price leapt from €185/t in 2021 to €451/t in 2022, a 143% increase in a single year. Export prices for the same product rose from €172/t to €422/t (+145%).

The chlor-alkali process, which co-produces caustic soda and chlorine, is one of the most electricity-intensive processes in European chemistry. The 2022 spike in European electricity and natural gas prices following the Russian invasion of Ukraine directly translated into dramatically higher production costs and, consequently, higher trade prices.

3.2 Formal shock detection confirms acute price anomalies in 2022

The volatility analysis identified three significant shock events, all centred on 2022:

The Bosnia-Herzegovina shock (abnormality score of 309.9) reflects a near-tripling of export unit values to that market in 2022. Russia-linked import prices more than doubled (+125.3%), consistent with the direct impact of sanctions-related disruptions and energy-cost pass-through. The South Africa shock (a 1,160% price shift) is the most extreme but involves a small value share (2.2%), likely reflecting a small-volume niche trade distorted by the general price environment.

3.3 Volatility varied sharply across partners, with China and Ukraine showing extreme instability

The coefficient of variation (CV) of annual import values reveals that some partnerships were far more unstable than others:

China's imports into the EU showed extreme volatility (CV = 2.05), with import values ranging from €1.4 million to €185.1 million over the period, reflecting the sporadic and opportunistic nature of Chinese caustic soda shipments to Europe. Ukraine similarly exhibited high instability (CV = 1.25), with flows peaking at €27.7 million before collapsing to €3,445 in the last year — a reflection of the disruption caused by the war. By contrast, Norway (CV = 0.15 on imports) and Serbia (CV = 0.10 on exports) represent stable, predictable trade relationships.

3.4 The EU's net import reliance shifted from slight self-sufficiency to mild dependency

The EU's net import reliance moved from −3.4% in 2015 (a slight net exporter position) to +3.1% in 2025 (a slight net importer position), a swing of 191.9%. The peak was reached in 2022 at 11.4%, coinciding with the energy crisis. The negative values in earlier years indicate that the EU was, on balance, a net exporter of caustic soda and related products; the shift toward positive values — and especially the 2022 peak — reflects a combination of domestic production curtailments (driven by high energy costs) and surging import values. By 2025, the indicator had partially normalised but remained positive, suggesting a structural shift in the EU's trade balance for these products.

Conclusion

Over the 2015–2025 decade, the EU's trade in caustic soda, caustic potash, and related products (CN 2815) was shaped by three interconnected dynamics: pervasive price inflation far exceeding volume growth, a significant geographic reorientation of trade partners, and the traumatic impact of the 2022 energy crisis. Trade values roughly doubled on both the import and export sides, but this was primarily a price story — the EU's own production volumes contracted by nearly 20% while production values doubled, reflecting the electricity-intensive nature of chlor-alkali manufacturing. Import concentration increased substantially (HHI rising by 36.5%), with the United States emerging as the dominant supplier, likely leveraging its shale-gas cost advantage. The post-Brexit reversal of UK trade flows — from a major EU import source to an EU export destination — illustrates how regulatory and customs changes can fundamentally reshape chemical trade patterns. While the acute price spikes of 2022 have partially unwound by 2025, unit prices remain significantly above pre-2020 levels, and the EU's net import reliance has shifted from slight self-sufficiency to mild dependency, signalling a structurally altered competitive landscape for these essential industrial chemicals.