28 Feb PRE-GALVANISED FINISH IS ENVIRONMETALLY FRIENDLY
Pre-galvanised steel is a significantly more environment friendly manufacturing process than a post galvanising dip. Pre-galvanising applies a zinc galvanising to the metal sheet PRIOR to fabrication. The finish is a clean looking appearance that makes it visually pleasing and a good choice for inside installations where they can be seen. These products are suitable for extended exposure in dry, normal or mildly corrosive environments, but are not typically used outdoors. They have a zinc coating thickness equal to about one-third that of Hot Dip Galvanised products. Z275 designation is 275g/m2 of zinc.
Hot Dip Galvanised Steel
On the other hand, a post-fabrication zinc application involves chemical cleaning and stripping, and heavy metal dipping vats to apply the zinc. The most important advantage of the process is the overall coating thickness, which provides dual protection against corrosion through an overall barrier, and then a secondary defence of zinc, which gives the steel protection through galvanic action. Because they are post dipped this results in all of their surfaces being completely coated. Hot Dip Galvanised products are recommended for prolonged outdoor exposure because their coating will offer them protection for years in environments where they are exposed to the weather