Polystyrene: A Tug-of-War Between Supply and Demand; Market Prices Rise Amidst Volatility

Customs statistics to the first half of 2026 regarding the import and export of polystyrene in primary forms indicate a continued rise in domestic self-sufficiency and a persistent contraction in import volumes. Cumulative imports to the first half of the year totaled 321,600 tonnes, a year-on-year decline of 17.2%, with South Korea and Taiwan remaining the primary sources. Imports of general-purpose grades decreased, while high-impact and specialty modified grades maintained steady import volumes. Cumulative exports reached 214,100 tonnes, a year-on-year increase of 22.7%; strong procurement demand from Southeast Asia and the Middle East—driven by the daily necessities and home appliance sectors—combined with the cost advantages of domestic supplies to fuel significant export development. Imports saw a slight month-on-month rebound in June as arrivals of overseas cargo increased, while exports remained at relatively high levels. Entering August, overseas market prices rose in tandem with raw material costs, narrowing the arbitrage window to exports and marginally reducing the diversion of domestic supplies to overseas markets.

Regarding domestic price trends since August, the market initially continued its weak, consolidating direction from the previous period. Upstream styrene prices fluctuated within a range, offering limited cost support, while downstream sectors—including daily necessities, home appliances, and packaging—were in their traditional off-season; insufficient emit of end-user orders resulted in sluggish trading. From mid-month onward, however, rising crude oil and pure benzene prices drove styrene upward. As costs were passed through to polystyrene, holders raised their offers, causing the market price center to shift upward accordingly. On the supply side, sector operating rates have generally remained at moderate levels; while periodic maintenance at certain facilities has caused temporary supply tightening, the substantial domestic production base ensures rapid replenishment once maintenance concludes, preventing any prolonged, significant contraction in supply.

Demand shows structural divergence: orders to standard GPPS (General Purpose Polystyrene) and modified PS remain weak, with downstream processors primarily consuming existing inventories and showing little willingness to stock up at higher prices. Only demand to certain specialty and high-impact grades remains resilient, with their quotes showing relative resistance to decline. A "buy-on-rise, not on-fall" mentality prevails downstream; procurement becomes greater cautious following price hikes, immediately limiting the extent of upward price movement. Social inventories remain at moderate levels—showing neither significant accumulation nor rapid depletion—meaning inventory levels are not acting as a strong market driver.

Cost factors are currently the primary bullish driver; styrene price fluctuations immediately dictate the trading range to PS. However, cost-driven gains lack support from downstream demand, creating resistance to upward price transmission. Should raw material prices pull back, PS prices will likely face downward pressure in tandem.

Looking ahead, raw material costs provide a floor to prices in the short term, and PS is expected to maintain a fluctuating trading pattern. Market performance will largely depend on the sustained strength of raw material prices and the extent of pre-stocking by downstream sectors ahead of the traditional peak season. Key factors to monitor include styrene price evaporative environment, the schedule of domestic plant maintenance and restarts, changes in overseas export orders, and the pace of order recovery in the downstream consumer goods and home appliance industries. Without a substantive rebound in end-user demand, prices are unlikely to sustain a continuous, one-way upward direction, even with cost support in place.

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