Specification 1) Tensile strength: 300 390MPa 2) Elongation: min 15% 3) Metallic chromium weight: min 50mg/m2 4) Chrome hydration 5) Oxidizing layer: min15mg/m2 6) Thickness: 0.15±0.015mm 7) Width: 600 610mm 8) Length: min2100m 9) Core material: paper or iron pipe 10) Temper: T1 - T3 11) ID: 406 or 508+/-2mm