For Expandable Polystyrene (EPS), segmentation follows a similar dual‑axis of application and type. Application‑wise, EPS is predominantly employed in building insulation (40% of EPS consumption), packaging (30%), construction (including concrete forms and decorative blocks, 15%), automotive lightweighting (10%) and marine flotation (5%). Insulation benefits from EPS’s low thermal conductivity, driving the largest share, while packaging leverages its shock‑absorbing properties. Regarding type, EPS is classified by density grades: low‑density EPS (used in packaging), medium‑density EPS (building insulation panels), and high‑density EPS (structural construction elements). Low‑density EPS accounts for 35% of EPS volume, medium‑density 45%, and high‑density 20%. These type distinctions affect raw material input and processing costs, thereby shaping the overall EPS market size. The market taxonomy highlights that application distribution, especially the dominance of insulation, is the primary determinant of EPS market growth.