... 30days 4.Availability:20,000tons/year pavement gratingUnique features:Light weight, heavy-duty, large loading-bearing capacity, economical, ventilated, ... Austrilia: AS1657-1992Marks:Example: G 325/30/100 WFG1.CERTIFICATEINTRODUCTION TO COMMON STEEL GRATINGS:Bearing bar centers at 20mm: This kind ... ceiling of stadium in terms of it's light weight.Notes: common welding standard: single-side full welding ...