Rock Wool vs. Polyurethane Sandwich Panels: Fire, Insulation & Cost Compared

When you're building a warehouse, factory, or cold storage facility, one of the first decisions is the core of your sandwich panel — rock wool or polyurethane. They serve different jobs, and choosing wrong can mean fire risk, energy waste, or wasted budget. Here's an honest comparison to help you decide.

1. What Are They?

• Rock wool sandwich panel — a mineral-fiber core that is non-combustible and fire-rated, ideal for walls and roofs where fire safety matters.

• Polyurethane (PU) sandwich panel — a rigid PU foam core with excellent insulation per unit thickness and light weight; the standard choice for cold storage and refrigerated buildings.

2. Quick Comparison

3. How to Choose

• Choose rock wool when fire safety and acoustic performance are the priority — factories, warehouses, cleanrooms, or projects under strict fire codes.

• Choose PU when energy efficiency and cold storage come first — cold rooms, freezers, refrigerated warehouses.

• Many smart projects combine both: fire-rated rock wool walls plus PU for cold areas — or fire-rated rock wool panels with PIR polyurethane side sealing, which add airtightness and anti-cold-bridge performance to a non-combustible core.

4. Why SENBO

SENBO supplies both rock wool and polyurethane sandwich panels in 1000 mm effective width and 50–150 mm thickness, with custom sizes, colors, and surface finishes (flat, corrugated, water-wave, embossed). We also offer fire-rated rock wool panels with PIR side sealing for better airtightness and anti-cold-bridge performance. Send us your project drawings for a tailored recommendation and quotation.