A single table is provided in AS/NZS 2312.2 for designers to compare the expected durability of different galvanized products, allowing for a faster product selection process. The durability of a HDG coating is calculated from the minimum average coating thickness in AS/NZS 4680, which also means non-standard HDG thicknesses can be easily assessed for estimated life to first maintenance.
|Reference Standard||Article Thickness mm||Average Coating Thickness||Selected Corrosivity Category (ISO 9223)
Calculated min.-max. life in years
|HDG320||Less than 1.5||320||45||100+||64-100||21-64||11-21||5-11||2-5|
|HDG390||1.5 to 3.0||390||55||100+||78-100||26-78||13-26||6-13||2-6|
|HDG500||3.0 to 6.0||500||70||100+||100+||33-100||16-33||8-16||2-8|