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GalvInfoNote Understanding Coating Weight …

GalvInfo Center email: Toll-free phone: 1-888-880-8802 1 GalvInfoNote 1 Understanding Coating Weight Designations for Zinc-Based Coatings on Steel Sheet Rev Jan-04 Introduction One of the most confusing topics related to coated-steel sheet products is the issue of Coating Weight designations and what they mean with respect to product performance. This discussion is intended to help clarify this issue. Coating Weight Measurement Systems Each coated-steel sheet product has a Coating Weight designation system that is in common use today. The system for each type of Coating is defined in the appropriate ASTM standard. For example, the most commonly used ASTM standard is A 653/A 653M which covers hot-dip galvanized products. The Coating Weight designation system is given in terms such as G60, G90, etc.

units) of zinc on the surface of the steel sheet in Inch-Pound (English or Imperial) units of measurement. That is, for G90, the coating on one square foot of sheet (total coating, both sides of the sheet) weighs a minimum of 0.90 ounces. If equally applied to both sides of the sheet, there would be a minimum of 0.45 ounces on each surface.

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