Fire Resistant PIR Panel PIR Panel, PUR panel, PU insulated Panel Thermal offers a range of PIR (polysocyanurate) cored KRS approved to FM 4880 fire resistant insulated panels for all types of temperature controlled applications & controlled environment projects. Panels have a range of finishes standard rib Equi-Bead, flat & Micro Rib. The high thermal performance PIR core offers higher â??in useâ?� energy savings, and or reduced thicknesses of construction, when compared to other insulated panel systems. They are fire safe, hygienic and fibre free. Applications The complete range of insulated panels are suitable for both temperature controlled and hygiene safe environments for temperatures down to -40 degrees Celsius. They are ideally suited to food processing, deep freeze, cold and cool store, clean rooms for bio-technology and pharmaceutical industries, and ambient or elevated temperature storage rooms. Thickness Panels are available in lengths up to 16.5metres, in a range of thicknesses covering 50, 75, 100, 125, 150 and 200mm. This covers a range of R-values from 2.50 to 10.0 m2K/W.