Coating & Corrosion Resistance Chart
A salt spray test (ASTM B117) measures how long coated fasteners resist corrosion.
| Coating Type | Salt Spray Test (Hours Until Rust) | Thickness (µm) | Best For |
|---|---|---|---|
| Zinc Plating (Standard) | 48 - 120 Hours | 5 - 15 µm | Indoor Use, Light-Duty |
| Hot-Dip Galvanizing (HDG) | 500 - 1000 Hours | 50 - 85 µm | Outdoor Use, Construction |
| Dacromet / Geomet (Zinc Flake) | 1000 - 2000 Hours | 7 - 12 µm | Aerospace, Marine, Industrial |
| Black Oxide | 24 - 48 Hours | 0.5 - 2 µm | Aesthetic, Low Corrosion |
| Teflon (PTFE) Coating | 2000+ Hours | 10 - 25 µm | Chemical, High Heat Environments |
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