High quality structural steel sheets are used to manufacture the silos. They comply with standards EN 10346 and S350 GD, which can tolerate 420-mpa pressure and 4200 kg weight. • The extent of yield stress: Minimum 350 mpa • The extent of tensile stress: Minimum 420 mpa Wall sheets are formed in a sinusoidal pattern for most resistance (pitch = 82 mm and depth = 12.1 mm). They are galvanized complying the following standards: (G-210) Z-600 gr/m2 - (G-140) Z-450 gr/m2 - (G-115) Z-350 gr/m2 - (G-90) Z-275 gr/m2