Detailed technical breakdown of thermal conductivity, fire performance, density, and cost across all 4 sandwich panel insulation cores.
Selecting the right insulation core is the most decisive specification parameter in sandwich panel procurement. An incorrect core selection risks fire insurance invalidation, excessive HVAC operational costs, internal condensation, or unnecessary dead-load onto steel frames.
1. Rigid PUR Thermal Characteristics
PUR offers 38-42 kg/m³ density and >95% closed-cell content, providing thermal conductivity of λ = 0.022 W/mK.
2. PIR & FM Global Fire Ratings
PIR incorporates isocyanurate chemistry, yielding self-extinguishing behavior and Euroclass B-s1, d0 ratings.
Comprehensive Engineering Comparison Matrix
| Engineering Property | PUR Core | PIR Core | Rock Wool Core | EPS Core |
|---|---|---|---|---|
| Density | 40 ± 2 kg/m³ | 40 ± 2 kg/m³ | 100 – 110 kg/m³ | 16 – 20 kg/m³ |
| Thermal Conductivity (λ) | 0.022 W/mK (Best) | 0.022 W/mK (Best) | 0.038 W/mK (Moderate) | 0.035 W/mK (Good) |
| Reaction to Fire | Euroclass B-s2, d0 | Euroclass B-s1, d0 | Euroclass A1 Non-combustible | Euroclass E |
| Fire Resistance | 15 – 30 min | 30 – 60 min | 60 – 120 min (REI 120) | 5 – 10 min |
Verdict: Specify PIR for conditioned export facilities; Rock Wool for firewalls and acoustic rooms; PUR for general manufacturing; and EPS for modular cabins.
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Frequently Asked Questions
What is the main benefit of PIR over PUR? ▼
PIR produces minimal smoke (s1) and zero flaming droplets (d0), satisfying FM Global insurance standards.