Planarity

The expanded metal mesh sheets are considered to be planar if, when placed on a flat surface with the curvature facing upwards, the greatest distance between the sheet and the flat surface does not exceed 20mm (over a width of 1000mm). In the case of heat-resistant sheets a distance of 40mm is allowed.

Curvature

The expanded metal mesh sheets are considered to be straight along the longitudinal edge if the curvature midpoint of a sheet with a metal thickness of up to 3mm shows a deviation of not more than 1.5% of the length of the straight line. For sheets with a thickness of 3mm or more the deviance may not exceed 2% of the length of the straight line.