are manufactured from Galvanized Steel (Sendzimir Process). This Galvanized
Steel Sheet is obtained by immersing a soft steel sheet in a zinc
bath, a stable iron-zinc alloy is formed with a predominance of pure
zinc on surface. The thickness of this zinc coating is 21 micron,
i.e. 275 gr/m2 on both sides. When a galvanized sheet of standard
thickness is sheared or punched, the cut edges of the metal are protected
by the formation of zinc electrolyte system.