ISO 12944: C4
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C4 - High Corrosion Environment Anti-Corrosion Solution
For chemical atmospheres and coastal salt spray environments, such as chemical plants, coastal buildings, and swimming pools
Applicable Standards
ISO 12944-2: C4 ISO 12944-5: 高腐蚀防护体系
## Corrosion Environment Definition
**ISO 12944-2 C4 Grade** — High corrosion environment. Chemical atmospheres, coastal salt spray environments.
Typical environments: Chemical plants, coastal buildings, swimming pools, ship interiors, high salt spray areas.
## Recommended Anti-Corrosion System
| Coat | Product | Coats | DFT (μm) |
|------|---------|-------|----------|
| Primer | Epoxy Zinc-Rich Primer (60-80%) | 1 | 60-80 |
| Intermediate | High-Build Epoxy MIO Intermediate Coat | 1-2 | 80-120 |
| Topcoat | Aliphatic Acrylic Polyurethane Topcoat | 2 | 80-100 |
| **Total** | | | **220-300** |
## Surface Preparation
- Blast cleaning Sa2½
- Surface roughness Rz 50-85 μm
## Design Life
Design service life: High (15-25 years).
## Application Scenarios
- Chemical plant equipment and piping
- Coastal building steel structures
- Swimming pool steel components
- Ship interiors
- Offshore platform auxiliary facilities
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