Market evolution: SAN copolymers (CN 390320) — 2015–2025

Introduction

Styrene-acrylonitrile (SAN) copolymers in primary forms (customs code 390320) are a specialty thermoplastic used across packaging, household goods, automotive components, and electronics. Over the 2015–2025 period, the EU's external trade in SAN copolymers underwent a profound structural transformation. While total import volumes grew by over 15%, the geographic composition of suppliers shifted dramatically, domestic production contracted, and the Union moved from a position of marginal self-sufficiency to a clear net-importer status. This report draws on the General Overview data to examine the key dynamics shaping this market.

1. The Asian Pivot: South Korea's Dominance and the Retreat of Western Suppliers

The most striking feature of the decade is the radical reorganisation of the EU's import geography. South Korea consolidated its position as the overwhelmingly dominant supplier, while almost every traditional Western-origin source experienced steep declines.

1.1 South Korea's ascent to market dominance

South Korean imports of SAN into the EU surged from approximately €40.8 million in 2015 to €60.2 million in the final period, a rise of +47.7%. Korea's imports peaked at €73.5 million during the period. Crucially, Korea is also by far the most stable supplier: its coefficient of variation across the full period stands at just 0.156, the lowest among all major import partners, reflecting consistent and predictable supply volumes. This reliability stands in stark contrast to the volatility observed for most other sources.

1.2 Collapse of traditional Western and Japanese suppliers

Against Korea's rise, several historically significant suppliers saw their share of EU imports evaporate:

(Sources: Top partners by value, Volatility bars)

Mexico's disappearance is particularly dramatic: the country went from €4.6 million to just €379,000, a -91.7% drop. Japan similarly fell from €3.9 million to €503,000 (-87.2%), suggesting that Asian producers other than Korea lost competitive ground—likely due to cost pressures, shifts in global styrene and acrylonitrile supply chains, or deliberate commercial retrenchment.

1.3 Malaysia as an emerging secondary source

Malaysia stands out as the only other supplier to have meaningfully grown its EU trade over the period, rising from €760,000 to €1.5 million (+94.0%), although it remains far smaller than Korea. This may reflect broader Southeast Asian petrochemical capacity additions and suggests a partial diversification away from the Korea-only concentration.

2. Declining EU Production and the Shift to Net Import Dependence

Beneath the trade-flow data lies a deeper structural story: the EU's own SAN production capacity has been shrinking, fundamentally altering the region's self-sufficiency position.

2.1 Domestic production has contracted meaningfully

According to PRODCOM production data, EU production of SAN copolymers fell from 189,186 tonnes at the start of the period to 160,000 tonnes at the end — a decline of -15.4% in volume. In value terms, output dropped from €220 million to €200 million (-9.1%). This contraction implies the closure or mothballing of production lines, consistent with broader trends of European petrochemical rationalisation in the face of rising Asian capacity and higher European energy costs.

2.2 The EU swung from near self-sufficiency to clear net import dependence

The net import reliance metric captures the combined effect of trade and production. At the start of the period, the EU's net import reliance stood at -3.3%, meaning the Union was a marginal net exporter. By the end of the period, it had swung to +19.0% — a change of +672.7% in relative terms. At its peak, the figure reached 37.2%. This is perhaps the single most consequential development of the decade: the EU has moved from self-sufficiency to structural dependence on external suppliers for a key engineering plastic.

2.3 Exports shrank as the production base eroded

The decline in EU production naturally fed through into lower export volumes. Total EU exports of SAN fell from 8,254 tonnes to 7,735 tonnes (-6.3%), and export value slipped from €13.6 million to €12.8 million (-5.4%). The most notable export-market losses were:

(Source: Top partners by value)

The near-total collapse of EU exports to Israel (from €1.0 million to €17,000, -98.3%) is striking and may reflect a combination of Israeli tariff adjustments, competition from alternative suppliers, or end-use substitution.

Bright spots on the export side include China (from €105,000 to €659,000, +530%) and the United States (from €740,000 to €1.2 million, +63.7%), though these remain small in absolute terms. Türkiye also grew modestly from €3.6 million to €4.4 million (+24.2%), becoming the EU's second-largest export destination.

3. Rising Concentration, Price Shocks, and Growing Vulnerability

The combination of supplier consolidation and declining domestic capacity has reshaped the risk profile of the EU's SAN market.

3.1 Import concentration nearly doubled, amplifying supply-side risk

The Herfindahl-Hirschman Index (HHI) for import concentration by value rose from 4,187 to 7,842 (+87.3%). An HHI approaching 8,000 indicates a highly concentrated import structure — virtually synonymous with South Korean dominance. For context, the EU's export-side HHI remained far lower (1,802), reflecting a more diversified but shrinking set of destinations. The import-side concentration represents a material strategic vulnerability: any disruption to Korean supply — whether from production outages, trade disputes, or logistics bottlenecks — would disproportionately affect EU availability.

3.2 Price dynamics diverged between imports and exports

A notable divergence opened up between import and export unit prices over the period:

(Source: General Overview — trade)

Falling import prices combined with growing volumes suggest that Korean and other Asian suppliers have competed aggressively on price, benefiting EU downstream converters but squeezing the margins of remaining EU producers. Stable export prices, meanwhile, indicate that the EU still manages to place higher-value or specialty-grade SAN in niche markets.

3.3 The 2021 supply chain crisis left visible price shocks

The shock detection analysis identified several abnormal price events concentrated in 2021, the year of the post-COVID global supply-chain crisis:

These sharp price spikes on EU exports — particularly the 57% jump in export prices to the United States — reflect the global commodity price surge and logistics disruptions of 2021, when freight rates, energy costs, and feedstock prices all spiked simultaneously.

3.4 The EU's trade deficit widened despite higher import volumes

The EU's trade balance in SAN deteriorated from -€51.8 million at the start of the period to -€55.2 million at the end, having peaked at -€74.5 million in an intermediate year. Trade intensity (the share of consumption accounted for by trade) increased by 86.6%, while export propensity fell by 22.6%, underscoring that the EU's role in global SAN trade has shifted from balanced participant to net buyer.

Conclusion

Over the 2015–2025 period, the EU's SAN copolymer market has undergone a fundamental rebalancing. Domestic production shrank by over 15%, converting the EU from a marginal net exporter into a net importer reliant on external supply for nearly one-fifth of its consumption. This growing dependence has been channelled overwhelmingly through South Korea, which now accounts for a dominant and increasingly concentrated share of EU imports — a fact reflected in the near-doubling of the import-side HHI. Traditional suppliers from the Americas, Japan, and the United Kingdom have all but exited the picture.

For EU downstream industries, falling import prices have provided short-term cost relief, but the concentration of supply in a single origin creates strategic fragility. Any future disruption to Korean production or logistics — whether from geopolitical tensions, natural disasters, or trade policy changes — could have outsized effects on EU SAN availability. Policymakers and industry stakeholders may wish to consider whether targeted measures to support European production capacity or to actively diversify import sources could mitigate this growing vulnerability.