## Common ground
All options are gas containers made from different metallic or plastic materials.
## Options at a glance
**3925.10 – Plastic material**
- **Defining trait:** Made from non-metallic, lightweight synthetic resin (e.g., polyethylene).
- **Typical examples:** Disposable propane canisters, small camping gas bottles.
- **Best fit when:** Lightweight, low-cost, non-corrosive storage is needed; not for high pressure or long-term use.
**7311.00 – Iron or steel**
- **Defining trait:** Made from ferrous metal, typically carbon steel; strong and durable.
- **Typical examples:** Industrial oxygen tanks, large compressed gas cylinders.
- **Best fit when:** High-pressure resistance, long-term durability, and structural strength are required.
**7419 – Copper**
- **Defining trait:** Made from copper, known for excellent thermal conductivity and corrosion resistance.
- **Typical examples:** Refrigerant lines, specialized gas systems in HVAC.
- **Best fit when:** Thermal performance or non-sparking properties are critical; rare for general gas storage.
**7508.90 – Nickel**
- **Defining trait:** Made from nickel or nickel alloys; highly corrosion-resistant and heat-tolerant.
- **Typical examples:** Chemical processing equipment, high-purity gas systems.
- **Best fit when:** Exposure to corrosive gases or extreme temperatures.
**7613.00 – Aluminium**
- **Defining trait:** Lightweight, corrosion-resistant, and recyclable; good for portable use.
- **Typical examples:** Portable propane tanks, scuba air cylinders.
- **Best fit when:** Portability and resistance to rust are key.
**7806.00 – Lead**
- **Defining trait:** Made from lead; dense and chemically inert but toxic and heavy.
- **Typical examples:** Not used for gas containers; historically obsolete.
- **Best fit when:** None — this is not a practical material for modern gas containers.
**7907.00 – Zinc**
- **Defining trait:** Made from zinc; brittle, low melting point, poor for pressure vessels.
- **Typical examples:** Not used in gas storage; only for coatings or alloys.
- **Best fit when:** None — not suitable for pressurized gas containers.
**8007.00 – Tin**
- **Defining trait:** Made from tin; soft, low strength, poor for pressure applications.
- **Typical examples:** Food cans, not gas containers.
- **Best fit when:** None — unsuitable for gas storage.
**8101.99 – Tungsten**
- **Defining trait:** Made from tungsten; extremely dense and heat-resistant but brittle and expensive.
- **Typical examples:** Rare; used in specialized high-temp applications, not general gas containers.
- **Best fit when:** Extreme temperature resistance needed (e.g., aerospace), but impractical for most uses.
**8104 – Magnesium**
- **Defining trait:** Made from magnesium; very lightweight but flammable and reactive.
- **Typical examples:** Not used in gas containers due to fire risk.
- **Best fit when:** None — unsafe for pressurized gas storage.
## Key differences
| Material | Strength | Weight | Corrosion Resistance | Common Use Case |
|---------------|----------|----------|------------------------|--------------------------|
| Plastic | Low | Very light | Moderate | Disposable, low pressure |
| Steel | High | Heavy | Low (unless coated) | Industrial, high pressure |
| Copper | Medium | Medium | High | Thermal systems |
| Nickel | High | Medium | Very high | Chemical/medical |
| Aluminium | Medium | Light | High | Portable, outdoor |
| Lead/Zinc/Tin | Low | Heavy | Varies | Not for gas containers |
| Tungsten/Mg | High | Very heavy/light | High (Tungsten) | Specialized only |
## How to choose
- Is the container lightweight and portable? → 7613.00 (Aluminium)
- Does it need to withstand high pressure and industrial use? → 7311.00 (Steel)
- Is corrosion resistance critical (e.g., chemicals, salt air)? → 7508.90 (Nickel) or 7613.00 (Aluminium)
- Is it for a specialized high-temp or non-reactive system? → 7419 (Copper) or 8101.99 (Tungsten)
## Overlaps & pitfalls
- **Overlaps:** Aluminium and copper both offer good corrosion resistance; steel and nickel are strong but differ in weight and cost.
- **Pitfalls:** Lead, zinc, tin, magnesium, and tungsten are not practical for gas containers due to toxicity, brittleness, flammability, or cost. Avoid these unless for highly specialized, non-pressure applications.
- **Priority:** Choose based on the product’s MAIN function — if it's portable, go aluminium; if industrial, steel; if corrosive environment, nickel