Comparison
HDGI vs ZAM Coating for Solar Structures
Both are premium corrosion coatings. HDGI protects with a thick, full-coverage zinc layer; ZAM protects at lower mass and self-heals cut edges.
| Specification | HDGI (Hot-Dip Galvanised) | ZAM (Zn-Al-Mg) |
|---|---|---|
| Protection mechanism | Thick zinc barrier + sacrificial | Alloy barrier + self-healing edges |
| Cut-edge behaviour | Fully covered by dipping | Self-heals at exposed edges |
| Coating mass | High | Lower for similar life |
| Best for | Ground-mount, coastal, long life | Coastal, sheared/punched members |
| Relative cost | Higher (more zinc) | Higher (alloy) |
Frequently asked questions
- Which is better for coastal sites?
- Both perform well; HDGI gives thick full coverage, ZAM self-heals cut edges at lower mass. Design and budget decide.
Not sure which to choose?
We will recommend based on your site and load case.