Camber is the greatest deviation of a side edge from a straight line. The measurement is taken over the entire length of the concave side with a straight line.

On perforated sheets with different side margins (E-2 > E-1) it is possible to produce a camber effect. This effect is the deflection (D) between one of the longitudinal edges and a straight line supported by the ends of the sheet.

The magnitude of the deflection (D) depends on the length, width, thickness, open area, type of material and relation of E-2 to E-1.

If sheets are cut after perforation, the camber refers only to the perforated pattern. (See sketch below F & G)

Designers are requested to avoid different margins whenever possible.