Definition
Small pre-expansion polystyrene particles used to create lightweight, rigid foam products. Composed of polystyrene resin infused with a blowing agent (typically pentane).
Production Process
- Polymerization: Styrene monomers → polystyrene resin
- Bead Formation: Processed into spherical beads (∼0.2–3 mm)
- Impregnation: Addition of blowing agent
- Expansion: Heat with steam → 50× size increase
- Molding: Fuse beads using steam molds
Key Properties
| Lightweight | 98% air content |
| Insulating | Excellent thermal/acoustic performance |
| Cushioning | Shock-absorbent structure |
| Water-Resistant | Closed-cell design |
Applications
- 📦 Packaging (electronics, fragile goods)
- 🏗️ Construction insulation
- 🍱 Food containers (cups, coolers)
- 🛋️ Consumer products (bean bags, crafts)
