1.Quality :A 2.Material :steel 3.width:820,840 .900 ,etc(after corrugated ) 4.spangel : ... no spangle ,regular spangle or small Raw materials: color steel coil: It is light, weatherable, stain-resistant, and easy to ... as airport, , railway station, conference and exhibition center, stadiums, university buildings and so on.PerformanceExcellent self-tightness, free expansion of structure ...