Kingspan Kooltherm K5 External Wall Board is a high performance, fibre-free rigid thermoset phenolic insulation core, sandwiched between two layers of tissue based facing autohesively bonded to the insulation core during manufacture. Kingspan Kooltherm K5 External Wall Board is manufactured without the use of CFCs/HCFCs and has zero Ozone Depleting Potential (ODP) and low Global Warming Potential (GWP).