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This EPD is for Xtratherm (Polyisocyanurate) PIR insulation boards: CT/PIR, FR/ALU, FR/BGM, FR/MG, Thin-R, of thickness 100mm, the R values quoted are minimum values and the EPD is calculated on this basis. The PIR boards typically comprise of primary raw materials MDI, polyol, flame retardant, pentane, with the addition of minor amounts of admixtures. Depending on intended use, the board facing elements comprise various combinations of the following materials: paper, foil, hard plastic, mineral glass, bitumen fibre. The primary raw materials are mixed with various catalysts & additives and placed between two layers of facing elements. The insulation products are manufactured in accordance with BS EN 13165:2012+A2:2016 Thermal insulation products for buildings. These Xtratherm insulation products are used in cavity walls, steel and timber-frame walls, soffit, floor, pitched and flat roof insulation applications.