System Overview A PIR Cleanroom Panel bonds two coated-steel facings to a rigid polyisocyanurate (PIR) foam core — a high-insulation, fire-improved cleanroom wall and ceiling panel made to a ≤ 2 mm/2 m flatness tolerance. Key advantages: Insulation + Better Fire: Near-PU thermal performance with an upgraded Class B1 fire rating. Chars, Doesn't Melt: Forms a stable char with low smoke under fire, improving fire integrity. Lightweight & Sealed: Closed-cell core blocks moisture, with a strong facing bond and clean surface.