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Kingspan Insulation Boards Thermawall TW50 is a high-performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core. Low emissivity composite foil and thermal conductivity - 0.022W/mK. Kingspan Thermawall TW50 1.2 x 0.45-metre board is available in the following thicknesses: 25mm 30mm 40mm 50mm 60mm 70mm 75mm 90mm 100mm Contact us today.