TECHNICAL

Durability

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
g/m² μm C1 C2 C3 C4 C5 CX
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
HDG600 Over 6.0 600 85 100+ 100+ 40-100 20-40 10-20 3-10
HDG900 Over 6.0+ 900 125 100+ 100+ 60-100 30-60 15-30 5-15
Refer to our Specifying Galvanizing booklet for more detail.