... film, each wooden tray can hold 500 pieces of colorful stone-coated alum-zinc roofing tiles and ... light as 6kg/m2, approximately 1/8 of that of clay tile and cement tile. It is proved to ... widely used due to its recyclables in the construction of villa, mansion, chamber, and so on.b) ... to the eye: Owing to the diffuse reflection of vermiculites, its flamboyant looking and tridimensional appearance, metal ...