OSB(Oriented Strand Board) on both sides, PU(Polyurethane)/EPS(Polystyrene) rigid foam as core. Widely used in housing and commercial buildings, is a coming trend of building. For example ,OSB thickness 12mm/PU,Heat resister date as follow, 50mm 1.43 M2.K/W 75mm 2.62 M2.K/W 100mm 3.81 M2.K/W 125mm 5.95 M2.K/W 150mm 6.19 M2.K/W