Corrugated steel sheetquality problemPoor adhesion, down lateral buckling, lateral buckling up, upward warping longitudinal, vertical downward warp, S-type warp, two-way warp, part unglued, double-effect warping, glossy paper crease, low flute , flute wrinkles, lower the thicknessCharacteristics1.weather proof2.Anti rust3.Fire proof4.Heating insulation5.Long life span: more than 20 yearsmaterialSPCC, SGCC, Dx51D,SGCH and so onstandardJIS G3312 (equivalent to TCD51D, CGCC, ASTM A755)Thickness of coating0.2mm～1.0mmFor wall or roofingroofing