HDG & EPD
In 2016, the AGA released an industry-wide Environmental Product Declaration (EPD) developed by world-renown environmental firm thinkstep, Inc. and verified by UL Environment, Inc. The background life-cycle assessment utilized galvanizing data collected from the AGA, zinc information collected from the International Zinc Association (IZA), and steel/fabrication information from the American Institute of Steel Construction (AISC), Steel Tube Institute (STI), and the GaBi database.
The EPD covers galvanized hot-rolled structural sections, plate, and hollow structural sections (HSS). In addition to the full EPD, the AGA released three transparency briefs one on each product type. The EPD and briefs were developed in accordance with ISO 14025 including background LCA in accordance with ISO 14040/14044 standards according to the product category rule (PCR) for North America Designated Steel Construction Products.
The EPD is a cradle-to-gate study representing the raw materials supply (A1), transport (A2), and manufacturing stages of hot-dip galvanized steel (A3), as well as the benefits associated with the recovery of zinc scrap during the galvanizing process (D). The raw material stage (A1) accounts for raw material acquisition of both the steel and the zinc, as well as steel making and fabrication and zinc concentration and refining.
The manufacturing stage (A3) accounts for the application of the zinc metal to the steel through the hot-dip galvanizing process. The credit (D) only accounts for recycling during the production of the hot-dip galvanized coating (zinc dross and skimmings), and not for the full recyclability of the hot-dip galvanized steel product at the end of life.