URSA PUREONE Pure 40 RP mineral wool panel according to EN 13162 standard, covered with kraft paper as a vapor barrier, supplied on a panel or roll. The product is recommended for plasterboards walls. Properties: Reaction to fire: F Thermal conductivity coefficient:0.040 W/mK: thermal resistance R=2.50 [m2K/W] -thickness 100[mm]; thermal resistance R=5.00 [m2K/W] -thickness 200[mm];