... Stone Roofing Material 1.Stone Roofing Board:CE,ISO9001,ASTM,BS680,EN12326 2.Weather Resistance 3.Hard Roofing 2011 China ... :CE,ISO9001,ASTM,BS680,EN12326Specification for Roofing Slate:such as Water Absorption Test, Sulphuric Acid Immersion Test, Wetting and Drying Test,and so ... natural surface, sweeped edge. 6.Package: Wooden crate suitable for long transportation. 2011 China Stone Roofing Material