There are Canadian, international, and other special specifications sometimes used to specify hot-dip galvanizing on a project. The differences in these specifications and the ASTM specifications are minimal or may direct back to the ASTM specifications. The most common differences are in minimum coating thickness/weight required for each type and thickness of product being hot-dip galvanized.

Canadian CSA Specifications

CSA G164

Previously, CSA G164, Hot-Dip Galvanizing of Irregularly Shaped Articles, had not been updated since 1992, and seemed to have lost relevancy in the market and was seldom used. In 2018, G164 was updated to: include references to communication and power line hardware specifications, remove coating weight values in favor of coating thickness values, revise material classifications and associated minimum coating thickness, and mention alternative galvanizing options (thermal diffusion galvanizing and mechanical galvanizing). AGA publishes a detailed summary of the differences between ASTM A123 and CSA G164.

G164 vs. A123

Other CSA Specifications of Note:

• G40.8: Structural Steel with Improved Resistance to Brittle Fracture
• G40.12: General Purpose Structural Steel
• G40.20/G40.21: General Requirements for Rolled or Welded Structural Quality Steel

International Standards ISO Specifications

ISO 1461

Hot-Dip Galvanized Coatings on Fabricated Iron and Steel Assemblies. ISO 1461 specifies the general properties of and methods of test for coatings applied by hot dipping in zinc (containing not more than 2% of other metals) on fabricated iron and steel articles. It is only for after-fabrication hot-dip galvanized products and does not apply to products for which specific standards exist and which may include additional requirements or requirements different from those of this European Standard.

Note: Hot-dip galvanizing to ASTM A123/A123M or ASTM A153/A153M will typically lead to an end quality equivalent to ISO 1461. However, there are significant differences between ISO 1461 and ASTM A123/A123M or A153/A153M regarding inspection methods and documentation. Please refer to ISO 1461 for the specific requirements regarding inspection methods and minimum average coating thickness requirements. The European General Galvanizers Association (EGGA) provides additional guidance on their website.

Other Organizations Specifications

The Association for Materials Protection and Performance (AMPP):

• SSPC SP2: Hand Tool Cleaning
• SSPC SP5/NACE No. 1: White Metal Blast Cleaning
• SSPC SP10/NACE No. 2: Near-White Blasting Cleaning
• SSPC SP 11: Power Tool Cleaning to Bare Metal
• SSPC-SP 16: Brush-Off Blast Cleaning of Non-Ferrous Metals

American Association of State Highway and Transportation Officials (AASHTO)

• T65 (ASTM A90): Mass of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy Coatings
• M111 (ASTM A123): Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
• M232 (ASTM A153): Zinc Coating (Hot-Dip) on Iron and Steel Hardware