... ,ASTM,BS680,EN12326 2.Roofing:Good,durable 3.Roofing Wuhan Building Material Roofing DecorationOur roofing slate:CE,ISO9001,ASTM,BS680,EN12326Specification for ... , 300x200, 300x300, 400x250, 400X200, 600x300etc. 3.Usual shapes: square, rectangle, U type and scale etc. . 4.Thickness (mm): 5-8, 6-9 ...