... strong. It is produced by injected EPS, PU or rook wool between 2 steel sheets. They have quite good capacity of ... from outside to inside are hanger, colour steel sandwich panel, glass wool and wall paper; can waterproof, soundproof, heatproof. 2. land: ... structure are : shape beam, ceiling, roof purlin, sandwich roof panel, glass wool, colour steel sandwich panel, glazed tile; the whole villa looks ...