XPS Sandwich Panels (Extruded Polystyrene Sandwich Panels) – Detailed Explanation

XPS sandwich panels are composite panels made of extruded polystyrene (XPS) foam as the core material, bonded with metal facings (such as color-coated steel or aluminum sheets) or non-metal facings (e.g., fiber cement boards). They are widely used in building insulation, cold storage, industrial plants, and other applications.

1. Key Features

(1) XPS Core Properties

Excellent thermal insulation: Low thermal conductivity (0.028–0.034 W/(m·K)), superior to EPS (expanded polystyrene foam).

High compressive strength: Ranges from 150 to 700 kPa, suitable for load-bearing applications.

Moisture & water resistance: Closed-cell structure with very low water absorption (<1%), ideal for humid environments.

Corrosion resistance: Waterproof and freeze-thaw resistant, making it suitable for cold storage and low-temperature logistics.

Fire performance: Standard XPS is Class B2 (flammable), but flame-retardant versions can achieve Class B1 (fire-resistant

(2) Facing Materials

2. Applications

Building walls & roofs: Used in steel-structure factories, logistics warehouses, and stadiums for both insulation and structural support.

Cold storage & refrigerated logistics: Moisture-proof and insulated, suitable for low-temperature environments (-30°C to +70°C).

Cleanrooms & pharmaceutical facilities: Anti-bacterial, easy to clean, compliant with GMP standards.

Transportation infrastructure: Energy-efficient enclosures for high-speed rail stations and airports.

Temporary structures: Quick-assembly site offices and container houses.

3. Relevant Standards

International:

EN 14509 (European sandwich panel standard)

ASTM C578 (XPS material standard)

China:

GB/T 23932-2009 (Metal-faced insulated sandwich panels for construction)

GB 8624-2012 (Combustion performance classification of building materials)

Conclusion

XPS sandwich panels are ideal for applications requiring thermal insulation, moisture resistance, and high strength, such as cold storage and high-standard industrial plants. However, fire safety must be considered. If budget is limited and fire resistance is not critical, EPS panels may suffice. For Class A fireproofing, rock wool or PUR panels are better options.