Extruded Polystyrene Foam for Thermal Insulation

Material Composition of Extruded Polystyrene Foam (XPS) for Thermal Insulation

1. Main material

   • Polystyrene (≥98%)
     Note: This is the primary polymer base, providing structural integrity and insulation properties.

2. Additives

   • Flame retardant (e.g., HBCD - Hexabromocyclododecane)
     Note: Enhances fire resistance to meet safety standards like GB 8624 (B1 class); HBCD is common but being phased out in some regions due to environmental concerns.
   • Blowing agent (CO₂ / environmentally friendly type)
     Note: Creates the foam's closed-cell structure; CO₂-based agents reduce ozone depletion, aligning with regulations like EU REACH.
   • Color masterbatch (green/blue marking)
     Note: Used for product identification (e.g., green for eco-friendly variants, blue for standard grades), aiding in quick visual sorting during installation.

Key Contextual Insights

• Why these additives? The combination ensures XPS foam achieves low thermal conductivity (0.028–0.034 W/(m·K)), high compressive strength (150–700 kPa), and moisture resistance (≤1.0% water absorption).
• Environmental note: Modern formulations prioritize eco-friendly alternatives, such as replacing HBCD with non-halogenated retardants and using CO₂ blowing agents to support green building certifications (e.g., LEED).