Allied vs. Pre-galvanized (G-60/G-90)

• Allied products exhibit superior corrosion resistance, both inside and out. Pre-galvanized products do not provide the "sealed in" protection of the Flo-Coat process. On the inside, a corrosion resistant zinc rich coating is applied after the tube is welded, and completely covers the interior. When pre-galvanized tube is welded, the ID welded area is left bare; unprotected since the ID cannot be re-metalized. The exposed metal is immediately left to be attacked by all corrosive elements. The OD weld is re-metalized, but is still highly susceptible to corrosion.

• Allied's 50/55 with Gatorshield delivers a minimum 55,000 psi yield strength and minimum 55,000 psi tensile strength. Pre-galvanized tube product offerings advertise only "target" yield and tensile strengths.

• Allied utilizes a special high-grade zinc material (meeting ASTM B-6) which has an average 13 ppm lead content. Pre-galvanized products typically have a much higher lead content level. By having the lowest lead content achievable, Allied zinc products can keep noxious fumes generated during welded to an absolute minimum.

• Allied's Flo-Coat process provides all tubular products with a smooth, shiny, clean appearance that will not flake or chip during fabrication. In addition, the synergistic triple coating retards oxidation (graying down) and flaking common to pre-galvanized tube products.

• Unlike Allied's products, tubing manufactured from pre-coated steel coils/sheets requires special surface treatment prior to the application of paints or powder coatings; otherwise, proper adhesion is not obtained. These pre-treatments may contain phosphating, anodizing, conversion coating, or use of a special primer. Whichever process is utilized, it will add cost to the end product and possibly generate hazardous waste materials. Furthermore, a re-metalized weld seam on the OD will have a surface, and may cause poor adhesion of paint and powder to that area of the tube.