Polyisocyanurate (PIR)

What Is Polyisocyanurate (PIR)? High Fire Performance and Thermal Insulation for Sandwich Panels

Polyisocyanurate (PIR) is an advanced insulation core material derived from polyurethane systems and is widely used in sandwich panels where fire resistance and thermal performance are critical. PIR is formed by the reaction of isocyanate molecules with each other, creating isocyanurate rings that provide higher thermal and chemical stability than conventional polyurethane foams.

Due to the higher MDI content used in PIR production, the resulting molecular structure maintains its integrity at elevated temperatures for longer periods. This structural advantage significantly reduces flammability and smoke generation, making PIR an ideal choice for industrial buildings, logistics centers, and facilities with strict fire safety requirements.

PIR features a closed-cell structure, resulting in an extremely low thermal conductivity coefficient. This contributes to enhanced energy efficiency by minimizing heat loss and reducing heating and cooling costs. Its moisture-resistant nature ensures consistent performance even in humid environments.

Despite its lightweight structure, PIR offers high compressive strength, supporting the overall structural stability of sandwich panels. With the inclusion of flame retardant additives, PIR panels can achieve Euroclass B fire classification.

Thanks to its superior fire resistance, thermal insulation efficiency, and long-term durability, PIR stands out as a high-performance insulation solution for modern sandwich panel systems.