... 2.Weather Resistance 3.Hard Roofing 2011 China Stone Roofing MaterialOur roofing slate:CE,ISO9001,ASTM,BS680,EN12326Specification for Roofing Slate:such as Water Absorption ... Immersion Test, Wetting and Drying Test,and so on. Our roofing slate is widely applying to many styles of buildings roof ... edge. 6.Package: Wooden crate suitable for long transportation. 2011 China Stone Roofing Material