## Common ground
All options refer to expanded metals, a material formed by cutting and stretching sheet metal into a mesh-like structure.
## Options at a glance
**7314.50 – Iron or steel**
- **Defining trait:** Made from ferrous metal with high strength and magnetic properties.
- **Typical examples:** Steel grating for industrial floors, fencing, reinforcement mesh.
- **Best fit when:** High durability, load-bearing capacity, or magnetic use is needed.
**7419 – Copper**
- **Defining trait:** Conductive, corrosion-resistant, and non-magnetic.
- **Typical examples:** Electrical shielding, decorative panels, HVAC grilles.
- **Best fit when:** Electrical conductivity or aesthetic appeal is key.
**7508.90 – Nickel**
- **Defining trait:** Highly resistant to corrosion and heat; used in harsh environments.
- **Typical examples:** Chemical processing equipment, aerospace components.
- **Best fit when:** Extreme durability under high temperature or corrosive conditions.
**7616.9X – Aluminium**
- **Defining trait:** Lightweight, non-corrosive, and non-magnetic.
- **Typical examples:** Architectural screens, vehicle grilles, acoustic panels.
- **Best fit when:** Weight reduction or resistance to rust is important.
**7907.00 – Zinc**
- **Defining trait:** Corrosion-resistant but softer; often used for protective coatings.
- **Typical examples:** Roofing mesh, sacrificial anodes, decorative elements.
- **Best fit when:** Protection against corrosion or low-cost shielding is needed.
## Key differences
| Feature | Iron/Steel | Copper | Nickel | Aluminium | Zinc |
|------------------|------------|--------|--------|-----------|-------|
| Weight | Heavy | Medium | Heavy | Light | Medium |
| Corrosion resistance | Low | High | Very high | High | High |
| Electrical conductivity | Low | High | Low | High | Low |
| Magnetic | Yes | No | No | No | No |
## How to choose
- Is the product used in high-stress or heavy-load applications? → 7314.50
- Does it need electrical conductivity or a decorative finish? → 7419
- Is it exposed to extreme heat or chemicals? → 7508.90
- Is weight or corrosion resistance the priority? → 7616.9X
- Is it for low-cost protection or sacrificial use? → 7907.00
## Overlaps & pitfalls
A product may fit multiple categories (e.g., aluminium mesh can also be used in electrical shielding, but its primary trait is lightness). If a product combines traits (e.g., corrosion resistance and conductivity), choose based on the **main function**—not secondary properties. No option is vague; all are clearly defined by base material