Semi-rigid URSA TERRA FIT 34 mineral wool panel, according to EN 13162 standard, non-hydrophilic with high mechanical performance, without facing . Supplied in panel. The product is recommended for brick walls. Properties: Reaction to fire: A1 Thermal conductivity coefficient:0.034 W/mK; thermal resistance R=1.40 [m2K/W] -thickness 45[mm], thermal resistance R=1.90 [m2K/W] -thickness 65[mm],