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SANDWICH PANEL SELECTION
How to Select PIR, PUR, Mineral Wool or EPS Panels
Core selection should not be based on price or thickness alone. Thermal performance, fire behaviour, acoustics, weight, moisture, service temperature and project regulations must be evaluated together.
Direct answer
Core selection should not be based on price or thickness alone. Thermal performance, fire behaviour, acoustics, weight, moisture, service temperature and project regulations must be evaluated together.
Technical review: MDES Engineering Technical TeamUpdated: 2026-08-05
PIR and PUR
PIR and PUR foam cores offer low thermal conductivity and low weight. Depending on formulation, PIR may provide improved fire behaviour compared with PUR; the final classification must be verified in product documentation.
Mineral wool
Mineral-wool cores are selected where fire and acoustic performance are priorities. Higher density and weight must be considered in structural and installation planning.
EPS
EPS is an economical, lightweight insulation option. Fire and temperature requirements must be verified against the project classification and product certificates.
General core comparison
| Core | Key benefit | Check |
|---|---|---|
| PIR | Thermal performance/improved fire behaviour | Product classification |
| PUR | Thermal performance/low weight | Fire and temperature |
| Mineral wool | Fire and acoustics | Weight and installation |
| EPS | Economy and low weight | Fire class |
Key points
- Assess the certified complete product.
- Thickness alone does not define performance.
- Verify fire class for the complete panel.
- Consider service temperature and moisture.
Frequently asked technical questions
Which sandwich-panel core is best?
There is no universal best option; targets, regulations, budget and service conditions determine selection.
Is PIR always better than mineral wool?
No. PIR can offer thermal and weight advantages, while mineral wool may suit specific fire and acoustic targets.
Does fire class depend only on the core?
No. Facings, joints and the complete panel construction affect classification.
Which information is required for a sandwich panel quotation?
Specify the application, roof or wall type, core material, panel thickness, steel thicknesses, colour, total area, accessories, project location and delivery point. Fire and thermal performance must be confirmed against the project specification before ordering.
Technical references
- EN 14509 self-supporting double-skin insulating panels
- EN 13501-1 reaction-to-fire classification
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