The building envelope is critical to an industrial facility’s energy efficiency, safety, and longevity. When selecting sandwich panels for walls or roofs, the “core material” is the most important decision. Let’s compare the three industry standards: EPS, Rock Wool, and Polyurethane (PU/PIR).
1. Polyurethane (PU/PIR): The King of Insulation If energy efficiency and temperature control are your priorities, PU is the clear winner.
- Performance: It features the lowest thermal conductivity (approx. 0.019-0.023 W/m·k) among all common construction materials.
- Best For: Cold storage, high-precision manufacturing, and buildings in extreme climates. It offers excellent structural rigidity and airtightness.
2. Rock Wool: The Guardian of Fire Safety In many industrial sectors, fire resistance is non-negotiable.
- Performance: Rock Wool is a non-combustible Class A material that can withstand temperatures over 1000°C. While its R-value is lower than PU, it provides unmatched fire protection and superior acoustic insulation.
- Best For: Chemical plants, textile factories, and any facility where fire safety audits are rigorous.
3. EPS (Polystyrene): The Cost-Effective All-Rounder EPS is a classic, lightweight core material.
- Performance: Its primary strengths are its lightweight nature and highly competitive price point. It provides basic insulation and is very easy to install.
- Best For: Temporary structures, simple warehouses, or projects with tight budgets and standard fire safety requirements.
Comparison Summary:
- Insulation Power: Polyurethane (PU) > EPS > Rock Wool.
- Fire Resistance: Rock Wool (Class A) > Polyurethane (Flame Retardant) > EPS.
- Budget-Friendly: EPS < Rock Wool < Polyurethane.
There is no “one-size-fits-all” core material. Your choice should depend on local climate, regional fire regulations, and the specific function of your building. As a one-stop solution provider, we help you engineer the perfect balance of performance and cost.
Choose our company for a professional one-stop steel structure solution, from initial design to global delivery.