Japan’s Polystyrene market stabilized in October 2025. After a gradual decline through September, prices remained flat, supported by consistent demand from the electronics and packaging sectors. Participants in the market believe conditions are set to improve during the year-end —restocking after the summer and the typical surge in seasonal packaging will support price growth.
General purpose (GPPS) grade Polystyrene prices held steady in early October. The market was balanced, with supply and demand in alignment. This was a change from September, when prices fell about 1.1% from July, mainly because buyers turned cautious and packaging orders dropped during the summer holiday period.
Production remained steady in October. Plants operated at normal rates, with styrene supply running smoothly, allowing manufacturers to manage their production costs. They focussed on high-impact and specialty grades to meet demand from electronics, automotive, and premium packaging. Recycled Polystyrene became more prominent as companies pursued their sustainability targets.
On the demand front, the packaging industry maintained momentum, with stable orders from food, beverage, and e-commerce customers—even though activity eased marginally for seasonal reasons. Electronics sector played a key role as well. Robust sales of smart home devices, wearables, and 5G equipment kept high-impact Polystyrene sales constant, helping to prevent further price declines after September.
Moreover, derivative Expanded Polystyrene (EPS) demand in construction stayed firm. Ongoing insulation demand and increased interest in recyclable products supported the market. Automotive part manufacturers kept to their usual ordering patterns, while premium food-grade and electronics-grade Polystyrene continued getting higher margins, reflecting their unique applications and strict quality requirements.
Looking ahead to November, participants expect the Polystyrene market to strengthen. Forecasts by ChemAnalyst suggest a 3% price increase for GPPS. Packaging and electronics companies may plan to restock after summer, which could boost demand. Construction orders for EPS and packaging ahead of the holidays will also add support. With feedstock costs remaining steady, producers are likely to keep prices firm.
For December, the outlook is positive. Prices are projected to rise by another 1%, particularly as holiday packaging for food and consumer goods peaks. Electronics-grade Polystyrene is expected to stay in demand as manufacturers continue producing components. Still, typical year-end inventory reductions and holiday slowdowns may temper buying and limit price increases.
Japan’s Polystyrene market is on a stable ground at present. Reliable supply and steady demand across sectors are paving the way for a positive end, even as normal seasonal fluctuations continue.
