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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 |
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|---|---|---|---|---|---|---|---|---|---|
| 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 |