With a 25 year aged thermal conductivity as low as 0.025 W/m·K (at 10°C mean), Kooltherm FM Insulation is the most thermally efficient insulation material commonly used. A low thermal conductivity allows specified thermal performance standards to be achieved with thinner insulation.
The superior thermal performance of Kooltherm FM Insulation derives mainly from its closed cell properties. Its closed cell structure has been optimised to resist heat transfer. The closed cells have a small solid to void volume ratio, are small and uniform in size, and their construction very fine with extremely thin walls and minimum point contacts (struts). They are filled with a thermally efficient CFC/HCFC-free blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP). As a result of its closed cell, fibre free structure, Kooltherm FM Insulation is unaffected by air infiltration – problems that can be experienced with mineral fibre and which can reduce thermal performance.