Expandable Polystyrene (EPS) CAS#9003-67-2
High Stability and Reliable Physical Performance ：EPS is a low-density, lightweight material with superior heat insulation capacity. It does not dissolve in water, boasting satisfactory water repellency and steady physical characteristics. It mixes well with most commonly used additives for packaging and construction applications.
Consistent Long-term Performance ：At ambient temperatures, the material delivers strong resistance against weathering and aging. Its internal structure stays intact even after prolonged storage. It resists deformation and degradation, and absorbs almost no moisture, which simplifies warehousing and shipping arrangements.
Broad Application Range ：It serves many scenarios including shock-absorbing packaging components, thermal insulation panels for buildings, insulating fillers, buoyancy materials and lightweight consumer goods. It is also widely adopted for industrial cushion packaging, building insulation projects and general lightweight filling purposes.
Granular & Safe Composition ：The product takes the form of white, semi-transparent spherical beads, with no smell and non-toxic properties. Thanks to its expandable feature, it can be foamed and shaped when heated. It should be kept in airtight containers and kept far from high heat and naked flames.
Expandable polystyrene, molecular formula (C₈H₈)ₙ, is a kind of expandable resin presented as white spherical beads. This substance does not dissolve in water and features low density together with a high foaming multiplier. It delivers remarkable performance in thermal isolation, shock absorption, sound insulation and cushioning. As a mainstream polymeric foaming raw material, it can be processed into diverse end products through foaming, which are extensively applied within the construction and packaging sectors.
EPS Technical & Safety Specifications
| Item | Specification |
| Melting point | 240 °C (literature value) |
| Raw particle density | 1.05 g/cm³ |
| Refractive index | 1.59–1.60 |
| Appearance | White translucent spherical beads, odorless |
| pH range | 6.0–7.0 |
| Solubility | Insoluble in water; soluble in aromatic hydrocarbon solvents |
| Stability & reactivity | Heat-sensitive; stable at ambient temperature; incompatible with strong oxidizing agents |
| Storage conditions | Keep below 30 °C, dry and well-ventilated |
| CAS No. / HS code | 9003-67-2 / 39031100 |
| Hazard & transport | Hazard Code F; R11; S16-22-24/25; WGK 1; RTECS WL9750000; TSCA listed; UN 1993 |
This product is a modified polystyrene blend blended with blowing agent. When subjected to foaming and forming processes, it turns into low-weight foam components that deliver outstanding cushioning, thermal retention and acoustic insulation performance. As an essential feedstock, it is widely adopted for protective packaging, building insulation, buoyancy projects and lightweight industrial applications. It enjoys high market demand and extensive use across diverse industrial sectors.
