Expanded polystyrene (EPS beads)

Description

1. Product Overview

Expanded Polystyrene (EPS) beads are virgin-grade, pre-expandable spherical beads that serve as the base feedstock for manufacturing rigid foam products. Primary industrial uses include building insulation (XPS alternative), protective packaging for high-value goods, and geotechnical lightweight fill. The key value proposition is superior thermal performance (λ as low as 0.033 W/m·K) combined with 40-60% lower material cost than polyurethane foams. Strategically, EPS beads are critical for meeting global green building codes and circular economy goals due to 100% recyclability and low embodied energy.

2. Key Specifications & Technical Characteristics

• Chemical composition: Expanded Polystyrene (C₈H₈)ₙ, pentane blowing agent (4-6% by weight)

• Purity grade: Virgin polymer, >99.5% purity, no post-industrial recycled content unless specified

• Physical characteristics:

  • Form: Pre-expandable spherical beads

  • Color: White/opaque

  • Particle size: 0.7–1.2 mm (standard), 1.2–1.6 mm (coarse)

  • Bulk density (pre-expanded): 12–30 kg/m³

  • Raw bead density: 600–650 kg/m³

• Packaging options: 25 kg breathable polywoven bags, 1,000 kg super sacks, or vacuum-compressed bales

• Shelf life: 6 months in dry, ventilated storage below 30°C; avoid compression and direct sunlight

3. Core Industrial Applications

• Building & construction (70% of demand): Insulated concrete forms (ICF), structural insulated panels (SIP), roof and cavity wall insulation — outperforms mineral wool with 4× higher R-value per inch and no moisture wicking.

• Protective packaging: Molded corners, electronics cushioning, medical cold chain shippers — absorbs up to 30% more impact energy than corrugated paper at 50% lower weight.

• Civil engineering: Lightweight embankment fill for soft soils, road sub-base stabilization — reduces vertical stress by 85% compared to conventional soil fill, enabling construction on poor ground.

• Cold chain & logistics: Fish boxes, vaccine transport containers — offers 20% longer thermal hold time vs. polyethylene foam at comparable thickness.

4. Competitive Advantages

• Quality consistency: Every batch tested for bead size distribution (±5% tolerance) and pentane content (GC-MS verified) — rejects <0.3% in molding lines.

• Supply reliability: Stock holding in three regional warehouses (Asia, Europe, GCC) with 48-hour dispatch for standard grades.

• Logistics capability: Compression packing increases container utilization by 300% — 20 MT per 40ft HC container vs. 5 MT for loose beads.

• Price competitiveness: Direct from reactor → no trader markup; volume discounts >500 MT achieve 8-12% below regional averages.

• Sustainability: 100% virgin EPS is recyclable via densification (E.U. plastic packaging tax exempt if recycled content >30% — upon request).

• Technical support: Free pre-shipment molding trials; SDS, TDS, and REACH/ROHS compliance docs provided.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): 20 MT (one full 20ft container equivalent)

• Bulk order threshold: 20 MT

• Loading capacity (MT per container):

  • 20ft standard container: 20 MT (compressed bales or super sacks)

  • 40ft high-cube container: 20–22 MT (compressed format) / 5 MT (uncompressed bags)