## Common ground
All options refer to tyre cords—wires used in tire reinforcement—distinguished solely by their material composition.
## Options at a glance
**7312.10 – Made of iron or steel**
- **Defining trait:** Uses ferrous metal, offering high tensile strength and durability.
- **Typical examples:** Steel-belted radial tires, heavy-duty truck tires.
- **Best fit when:** High strength and load-bearing capacity are required.
**7413.00 – Made of copper**
- **Defining trait:** Uses copper, known for electrical conductivity but rarely used in tyres due to cost and low tensile strength.
- **Typical examples:** Not commonly used in standard tyre cords; may appear in specialized sensors or conductive tire prototypes.
- **Best fit when:** The cord serves a dual function as an electrical conductor (e.g., in smart tires).
**7614 – Made of aluminium**
- **Defining trait:** Uses lightweight aluminum, reducing overall tire weight but with lower strength than steel.
- **Typical examples:** Lightweight vehicle tires, some high-performance or electric vehicle applications.
- **Best fit when:** Weight reduction is prioritized over maximum strength.
## Key differences
| Feature | 7312.10 (Steel) | 7413.00 (Copper) | 7614 (Aluminium) |
|------------------|-----------------|------------------|------------------|
| Material strength | High | Low | Medium |
| Weight | Heavy | Medium | Light |
| Common use | Standard tires | Rare | Specialized |
## How to choose
- Is the cord primarily for structural strength? → 7312.10
- Does it need to conduct electricity? → 7413.00
- Is weight reduction the main goal? → 7614
## Overlaps & pitfalls
Copper and aluminium cords may overlap in niche applications (e.g., smart tires with embedded sensors), but copper is not standard for structural use. Steel dominates in most tyres. If a product combines functions (e.g., conductive + strong), prioritize the **main function**: structural reinforcement → 7312.10; electrical function → 7413.00. Do not assume material alone determines use—context matters