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AS 1397, G550, ASTM, A653, JIS G3302, Galvanized Sheet Metal Roofing GCRS: Material as per JIS G3302 SGCH (FULL HARD)/SGCC or AS 1397 G550 (HRB≥85), ASTM A653 Zinc coating: 40 g/m2 to 275 g/m2. ...