The material Kingspan insulation is made from varies depending on the product line.
The Kingspan Kooltherm range is made from a fibre-free rigid thermoset phenolic core, with a thermal conductivity between 0.019 - 0.022 W/mK.
Whereas the Thermaroof range is made from a fibre-free rigid thermoset polyisocyanurate (PIR) core, with a thermal conductivity between 0.022 - 0.027 W/mK.