FIRE PERFORMANCE FOR WOOD VENEER LAMINATED CEILING TILE

The present invention is directed to a building panel having a laminate structure comprising a cellulosic layer; and a topcoat layer that is substantially impervious to ambient moisture. The topcoat layer comprises a sealant sub-layer， an intumescent sub-layer comprising an intumescent composition， and the sealant sub-layer is positioned between the cellulosic layer and the intumescent sub-layer such that the intumescent sub-layer is separated from the first major surface of the cellulosic layer by the sealant sub-layer. The resulting building panel exhibits superior flame retardancy resulting in a Class A fire rating， according to ASTM E-84.

本发明涉及一种具有层压结构的建筑板材（building panel），该层压结构包含纤维素层（cellulosic layer）以及基本不透过环境湿气的面漆层（topcoat layer）。所述面漆层包含密封子层（sealant sub-layer）和包含膨胀型组合物（intumescent composition）的膨胀型子层（intumescent sub-layer），且密封子层位于纤维素层与膨胀型子层之间，使得膨胀型子层通过密封子层与纤维素层的第一主表面相隔离。所得建筑板材具备优异的阻燃性能，依据ASTM E-84标准可达到A级防火等级。