Market evolution: Filtration and centrifuging machinery (CN 8421) — 2015–2025

Introduction

This report examines the evolution of EU external trade in products covered by Combined Nomenclature heading 8421 — which encompasses centrifuges and centrifugal dryers, filtering or purifying machinery and apparatus for liquids or gases, and associated parts — over the period 2015–2025. The heading is broad, bundling twelve subcategories ranging from oil and petrol filters for internal combustion engines (842123) and catalytic converters (842132) to industrial gas-purification equipment (842139) and liquid-filtration machinery (842129). A full description and product breakdown is available on the Trade Dashboard overview page.

Over the eleven years studied, the EU's trade in CN 8421 expanded substantially. Total extra-EU exports rose from €11.4 billion in 2015 to €17.6 billion in 2025 (+54.7 %), while imports grew from €5.6 billion to €8.4 billion (+50.0 %). The resulting trade surplus widened from €5.8 billion to €9.2 billion (+59.1 %), confirming the EU's structural role as a net exporter in this sector. Behind these headline figures, however, the period was characterised by three major dynamics that merit closer examination: the disconnect between value and volume growth driven by rising unit prices, a dramatic reshuffling of the EU's key trading partners, and the consolidation of the EU's position as a global production and export hub.

1. Value growth far outpaces volumes, driven by unit-price increases and a shifting product mix

Export values rose strongly while volumes barely moved

The most striking feature of the 2015–2025 period is the divergence between value and volume trends on the export side. While export value grew by 54.7 % (from €11.4 billion to €17.6 billion), exported tonnage increased by only 1.4 % (from 500,719 t to 507,913 t). The implied average export price rose from €22,766/t to €34,709/t — a 52.5 % increase that accounts for virtually all of the nominal value growth. On the import side, the pattern was similar but less extreme: import value grew by 50.0 % while volumes rose by 37.0 %, implying a more moderate import-price increase of 9.5 % (from €19,782/t to €21,657/t).

Source: General Overview

The product composition of EU imports shifted markedly

Behind the aggregate price movements lies a significant structural shift in the product mix. The single largest import subcategory in 2015 was 842139 (machinery for filtering or purifying gases, excluding catalytic converters and intake air filters), which accounted for 41.7 % of total imports by value (€2.3 billion). This segment peaked at €4.1 billion in 2021 before falling sharply to €1.6 billion in 2025 — a decline of 61 % from its peak and a reduction of its import share to 19.0 %. In volume terms, 842139 imports peaked at 100,667 t in 2021 and fell back to 65,784 t in 2025, while its unit price declined from €40,623/t to €24,247/t.

Conversely, 842129 (filtering or purifying liquids, excluding water, beverages and oil filters) emerged as the largest import segment by 2025, with €1.7 billion (20.3 % of total imports), up from €691 million (12.3 %) in 2015. Water-filtration equipment (842121) also grew strongly, from €489 million to €1.07 billion. The catalytic-converter and particulate-filter subcategory (842132) appeared in the data from 2022 onwards, contributing €965 million in imports by 2025 — likely reflecting a classification or reporting change rather than entirely new trade flows.

Source: Product Segment Breakdown

Export composition remained comparatively stable

On the export side, the product mix was more balanced and stable over the period. Gas-purification machinery (842139) remained the largest single export subcategory, rising from €2.8 billion (24.2 % of exports) in 2015 to €3.6 billion (20.5 %) in 2025, despite a decline from its 2019 peak of €4.7 billion. Liquid-filtration machinery (842129) grew from €1.9 billion to €3.1 billion (+61 %), and oil/petrol filters (842123) rose from €980 million to €1.6 billion (+68 %), both gaining modest share. The centrifuges subcategory (842119), by contrast, saw its share shrink from 6.3 % to 4.1 % of exports, with value barely changing (€715 million to €731 million).

Domestic EU production expanded dramatically

EU production of CN 8421 products (as captured by PRODCOM data) grew from €7.2 billion in 2015 to €20.8 billion in 2025 (+186.8 %) in value terms, and from 609 million to 1,713 million items (+181.3 %) in quantity terms. This production growth significantly outpaced both export and import growth, suggesting that a larger domestic market — potentially driven by EU regulatory requirements in emissions control, water treatment, and industrial filtration — contributed to the sector's expansion. The link between production data and trade data can be explored further on the production volumes page.

2. Geographic reorientation: China's ascent, Russia's exit, and emerging-market diversification

China became the EU's foremost source of imports

The most dramatic geographic shift on the import side was the rise of China. EU imports from China grew from €611 million in 2015 to €1.7 billion in 2025 — an increase of 178.6 %. China thus overtook the United Kingdom (€1.16 billion, +4.1 %) and narrowed the gap with the United States (€1.93 billion, +79.3 %) to become a leading import source. India (+136.9 %, reaching €253 million) and Türkiye (+95.9 %, reaching €322 million) also registered strong import growth, though from much smaller bases.

South Africa, which had been the fifth-largest import partner in 2015 (€888 million), experienced a 31.0 % decline to €613 million by 2025. This was likely linked to the relocation of automotive production and changes in catalytic-converter supply chains — notably, the 842132 subcategory only appears in the data from 2022, and South Africa's decline in the broader 8421 heading may partly reflect reclassification.

Source: Partners — imports

EU exports to Russia collapsed following geopolitical sanctions

The most dramatic change on the export side was the near-total collapse of EU exports to the Russian Federation. From €745 million in 2015, exports to Russia initially grew to a peak of €1,079 million before plummeting to just €80 million in 2025 — a decline of 89.3 %. This 89.3 % drop erased Russia from its position as the EU's fourth-largest extra-EU export market. The coefficient of variation for Russia-bound exports stood at 0.576, by far the highest of any export partner, reflecting the magnitude of the disruption. This pattern is consistent with the EU sanctions regime imposed following Russia's invasion of Ukraine in 2022.

Meanwhile, the United States consolidated its position as the EU's largest export destination, growing from €1.77 billion to €3.17 billion (+78.7 %). Switzerland more than doubled its imports from the EU (+113.5 %, reaching €894 million), as did Brazil (+114.6 %, reaching €481 million). The United Kingdom, Türkiye, and several other mid-tier markets also posted strong growth, partially compensating for the Russian collapse.

Source: Partners — exports

Import concentration by volume increased sharply

An interesting structural indicator is the Herfindahl–Hirschman Index (HHI) of trade concentration. While the import HHI by value remained broadly stable (rising slightly from 1,269 to 1,295), the import HHI by volume surged from 1,290 to 2,274 — a 76.2 % increase. This divergence suggests that while the monetary distribution of import sources remained diversified, volumes became significantly more concentrated in a smaller number of supplying countries (most likely China). The export HHI remained low and relatively stable in both value (609 → 683) and volume terms, indicating that the EU continued to distribute its exports across a wide range of markets. Concentration data is available on the concentration page.

Volatility profiles varied significantly by partner

Volatility in trade flows, measured by the coefficient of variation (CV), differed markedly across partners. On the import side, Tunisia (CV 0.301) and China (CV 0.301) were the most volatile partners, while Switzerland (0.098) and Mexico (0.117) were the most stable. On the export side, Russia (CV 0.576) and Brazil (0.225) stood out for high volatility, while the United Kingdom (0.042) and Switzerland (0.063) were exceptionally stable export destinations — consistent with their roles as long-standing, geographically proximate trade partners. Full volatility profiles are shown on the volatility page.

Two isolated supply-shock events were also detected. An export price shock to Australia in 2019 showed an abnormality score of 50.1 and a year-on-year shift of +56.4 %, while an import price shock from India in 2023 registered an abnormality of 16.2 and a shift of +32.5 %. Both events were relatively contained in terms of their share of total EU trade value. Details can be found on the supply shocks page.

3. The EU consolidates its role as a global production and export hub

The trade surplus widened substantially, reflecting strengthening competitiveness

The EU's trade surplus in CN 8421 products grew from €5.8 billion in 2015 to €9.2 billion in 2025 (+59.1 %), peaking at €9.5 billion in an intermediate year. The net import reliance indicator moved from −27.1 % to −83.0 % over the period (negative values denote a net-exporter status). The near-tripling of this indicator in absolute terms reflects a sector in which the EU's export orientation intensified faster than its import dependency grew — even as both flows expanded.

Two closely related indicators corroborate this deepening internationalisation. Trade intensity — the ratio of extra-EU trade (exports + imports) to domestic production value — rose from 45.5 % to 88.6 %, while export propensity — the ratio of exports to production — climbed from 37.0 % to 84.2 %. The near-doubling of both ratios indicates that EU producers became far more export-oriented over the decade, selling an increasing share of their output on global markets.

Specialisation is concentrated in Central and Western European producers

Revealed symmetric comparative advantage (RSCA) data for 2025 shows that EU specialisation in CN 8421 is led by Portugal (RSCA 0.27, RCA 1.74), Czechia (RSCA 0.26, RCA 1.71), and Germany (RSCA 0.21, RCA 1.53). Poland (RSCA 0.16) and Romania (RSCA 0.08) also display positive, albeit more moderate, specialisation. At the other end of the spectrum, Malta (RSCA −0.83), Greece (RSCA −0.67), and Croatia (RSCA −0.58) show strong comparative disadvantage, meaning they are net importers of these products relative to their overall trade profile.

Source: Specialisation

Germany dominates, but Belgium and the Netherlands recorded the fastest growth

Among EU Member States, Germany remained the overwhelmingly dominant producer and exporter, accounting for €8.1 billion in extra-EU exports in 2025 (+44.9 % versus 2015) and contributing 32.5 % of the EU's total production value. Italy (€1.5 billion in exports, +36.2 %), France (€1.3 billion, +24.7 %), and the Netherlands (€1.1 billion, +88.4 %) followed at some distance.

However, the fastest growth was recorded by Belgium (+176.8 %, from €640 million to €1.8 billion) and Poland (+108.6 %, from €225 million to €469 million). Belgium's near-tripling of exports made it the EU's fourth-largest exporter by 2025, surpassing the Netherlands and Sweden.

Source: Reporters — exports

On the import side, Germany was also the largest EU importer (€2.5 billion, +9.6 %), but the fastest import growth came from the Netherlands (+167.2 %), Belgium (+85.1 %), and France (+104.1 %), suggesting that these countries serve partly as entry hubs for products subsequently re-exported or distributed within the single market.

Conclusion

Between 2015 and 2025, the EU's trade in filtration and centrifuging machinery (CN 8421) expanded robustly, with the trade surplus widening to €9.2 billion. The period was not one of uniform growth, however. Three defining dynamics shaped the market:

First, value growth was overwhelmingly price-driven. Export volumes grew by barely 1.4 % while export values rose by 54.7 %, reflecting a more than 50 % increase in average unit prices. This points to product upgrading, inflation pass-through, and a compositional shift toward higher-value segments such as liquid-filtration machinery (842129).

Second, the geographic map of trade was redrawn. China surged to become the EU's leading import source (+179 %), while EU exports to Russia collapsed by 89 % amid sanctions. Meanwhile, fast-growing emerging markets — India, Türkiye, Brazil, and Switzerland — absorbed a rising share of EU exports, partially compensating for the loss of the Russian market.

Third, the EU consolidated its global competitive position. Domestic production nearly tripled in value, trade intensity and export propensity both roughly doubled, and the net-exporter status strengthened dramatically. Specialisation remained anchored in Germany, Czechia, and Portugal, while Belgium emerged as a remarkably fast-growing exporter.

Looking ahead, the sector's deepening exposure to global markets (trade intensity of 88.6 %) and growing concentration of import volumes in a small number of partners (import volume HHI rising to 2,274) represent both opportunities and vulnerabilities. Monitoring shifts in the product mix — particularly the apparent decline of the gas-purification segment and the rise of catalytic converters and liquid-filtration equipment — will be essential for understanding the sector's future trajectory.