{"id":11529,"date":"2026-08-19T19:39:44","date_gmt":"2026-08-19T19:39:44","guid":{"rendered":"https:\/\/www.raxpanel.com\/?p=11529"},"modified":"2026-08-30T14:21:39","modified_gmt":"2026-08-30T14:21:39","slug":"%d9%83%d9%81%d8%a7%d8%a1%d8%a9-%d8%b3%d9%84%d8%a7%d9%85%d8%a9-%d8%a7%d9%84%d8%ad%d8%b1%d9%8a%d9%82-%d9%81%d9%8a-%d8%a3%d9%84%d9%88%d8%a7%d8%ad-%d8%b3%d8%a7%d9%86%d8%af%d9%88%d8%aa%d8%b4-%d8%a8%d9%8a","status":"publish","type":"post","link":"https:\/\/www.raxpanel.com\/ar\/blog\/pir-sandwich-panel-fire-safety-efficiency\/","title":{"rendered":"\u0633\u0644\u0627\u0645\u0629 \u0627\u0644\u062d\u0631\u0627\u0626\u0642 \u0648\u0643\u0641\u0627\u0621\u0629 \u0644\u0648\u062d\u0629 PIR \u0627\u0644\u0633\u0627\u0646\u062f\u0648\u064a\u062a\u0634"},"content":{"rendered":"

Most specifiers accept a false trade-off between thermal efficiency<\/a> and fire safety in their envelope design. That misconception drives up insurance premiums and complicates compliance. At RaxPanel, our standard PIR sandwich panel assemblies achieve a Reaction to Fire classification of B-s1,d0, ensuring structural integrity during a fire event without compromising insulation performance.<\/p>\n

Understanding the difference between Euroclass reaction to fire and fire resistance is critical for cold storage design<\/a>. We explain why PIR cores consistently outperform EPS<\/a> and mineral wool in thermal resistance per millimeter<\/a>. This approach helps you select a system that meets strict code requirements while reducing your total operational energy cost.<\/p>\n

\"PIR<\/figure>\n

What Fire Ratings and Classifications Mean for PIR Panels<\/h2>\n

Interpreting Reaction to Fire versus Fire Resistance<\/h3>\n

In the B2B procurement of insulated panels<\/a>, the most common and costly mistake we encounter is the conflation of “Reaction to Fire” with “Fire Resistance.” These are fundamentally different metrics that measure completely opposite behaviors, and confusing them can lead to failed inspections and insurance voidance. Reaction to Fire refers to how a material contributes<\/em> to a fire\u2014specifically its combustibility, flame spread, and heat release. It answers the question: “If this panel catches fire, will it fuel the flames or extinguish itself?” Conversely, Fire Resistance measures how a building element<\/em> (like a wall or roof assembly) performs under<\/em> fire exposure, focusing on structural integrity, insulation, and stability for a set duration.<\/p>\n

\n

Understanding this distinction is critical because it determines which panels are suited for which applications \u2014 and which mistakes can prove fatal on a project. This is where the chemistry of the core material becomes the decisive factor.<\/p>\n<\/blockquote>\n

For PIR sandwich panels, the core chemistry is thermoset<\/a>, meaning it is engineered specifically for superior Reaction to Fire. When exposed to flame, PIR forms a protective carbonaceous char layer that self-extinguishes once the ignition source is removed. This is distinct from thermoplastic materials (like some polyethylene cores) which may melt, drip, and spread the fire. However, achieving a specific Fire Resistance rating (e.g., 60 minutes integrity) relies heavily on the complete assembly\u2014including the thickness of the PIR core and the type of metal facing used\u2014rather than just the core material itself. We frequently advise clients that while we can guarantee the core chemistry (Reaction), the Fire Resistance rating must always be validated for the specific joint and assembly configuration being installed on-site.<\/p>\n

\n\u26a0\ufe0f Critical Pitfall:<\/strong><\/p>\n

Understanding how this performance mechanism is quantified for safety compliance requires a closer look at the standard classification systems used to evaluate combustion properties.<\/p>\n<\/div>\n

Decoding Euroclass Ratings for Building Envelopes<\/h3>\n

For projects falling under European regulations or those adopting international best practices, the Euroclass system<\/a> (EN 13501-1<\/a>) is the standard hierarchy for classifying the combustion performance of construction products. This system moves beyond vague descriptions to provide a codified framework from Class A1 (non-combustible) down to Class F (easily flammable). In the context of PIR sandwich panels, you will typically encounter Class B or Class C ratings, which indicate “limited combustibility” or “limited contribution to fire.”<\/p>\n

However, merely looking at the letter (B or C) is insufficient for a professional specifier. The true engineering data lies in the supplemental classification codes that follow the letter: s<\/strong> for smoke and d<\/strong> for flaming droplets. For instance, a rating of B-s1, d0<\/strong> represents the highest tier of performance for combustible materials. The s1<\/strong> designation indicates very low smoke production, while d0<\/strong> signifies no flaming droplets or particles. Our engineering team emphasizes that for applications like public transit infrastructure or high-occupancy buildings, specifying s1 and d0 is non-negotiable to ensure safe evacuation routes. Droplets (d2 or d1) can bypass fire barriers and ignite lower floors, turning a localized fire into a multi-story catastrophe.<\/p>\n