Kingspan Insulation Boards Thermawall TW50 is a high-performance insulation with a fibre-free rigid thermoset polyisocyanurate (PIR) core, insulant manufactured with a blowing agent that has zero Ozone Depletion Potential (OPD) and low Global Warming Potential (GWP). Low emissivity composite foil and thermal conductivity - 0.022W/mK. Kingspan Thermawall TW50 1.2 x 0.45-metre boards achieve a Green Guide Rating of A+. The TW50 is available in the following thicknesses: 40mm 50mm 60mm 70mm 75mm 100mm Please note that the TW50 in thicknesses 25mm, 30mm, and 90mm have been discontinued. Contact our sales team if you need an alternative Contact us today.