## Common ground
All options refer to channel gratings—perforated or slotted metal or plastic sheets used for drainage, ventilation, or structural support.
## Options at a glance
**3926.90 – Made of plastic material**
- **Defining trait:** Constructed from synthetic polymers (e.g., HDPE, PVC), offering corrosion resistance and lighter weight.
- **Typical examples:** Plastic drainage grates, garden path covers, chemical plant floor gratings.
- **Best fit when:** Used in corrosive environments, outdoor settings, or where low weight is critical.
**7325.10,7325.99 – Made of iron or steel**
- **Defining trait:** Fabricated from ferrous metals, providing high strength and load-bearing capacity.
- **Typical examples:** Heavy-duty industrial floor gratings, road drainage covers, warehouse access grates.
- **Best fit when:** Required for high-load applications, structural integrity, or durability in harsh conditions.
## Key differences
| Feature | 3926.90 (Plastic) | 7325.10,7325.99 (Iron/Steel) |
|---------------------|--------------------------|-------------------------------|
| Material | Plastic (non-metallic) | Iron or steel (ferrous metal) |
| Weight | Light | Heavy |
| Corrosion resistance| High | Low (unless coated) |
| Load capacity | Moderate | High |
## How to choose
- Is the grating used in a corrosive environment (e.g., chemical plant, wet area)? → 3926.90
- Does it need to support heavy loads (e.g., vehicle traffic, industrial machinery)? → 7325.10,7325.99
## Overlaps & pitfalls
A grating may be made of steel but coated with plastic—this could blur the line. However, the primary material determines classification. If unsure, prioritize the **main structural material** (e.g., steel core = 7325; plastic body = 3926). No option is vague