## Common ground
All options are containers designed to hold pressurized contents, such as gases or liquids under pressure.
## Options at a glance
**3925.10 – Plastic material**
- **Defining trait:** Made from thermoplastic or thermosetting polymers, lightweight and corrosion-resistant.
- **Typical examples:** Gas cylinders for camping stoves, aerosol cans, plastic fuel tanks.
- **Best fit when:** Lightweight, non-metallic, or chemically resistant containers are needed.
**7311.00 – Iron or steel**
- **Defining trait:** High strength and durability; often used for high-pressure applications with thick walls.
- **Typical examples:** Industrial gas cylinders (e.g., oxygen tanks), compressed air tanks.
- **Best fit when:** Maximum pressure resistance and mechanical robustness are required.
**7419 – Copper**
- **Defining trait:** Excellent thermal conductivity and corrosion resistance, but lower strength than steel.
- **Typical examples:** Refrigerant lines, heat exchangers, specialized gas storage in HVAC systems.
- **Best fit when:** Thermal performance or compatibility with certain gases (e.g., ammonia) is key.
**7508.90 – Nickel**
- **Defining trait:** High resistance to corrosion and extreme temperatures; used in harsh environments.
- **Typical examples:** Aerospace fuel tanks, chemical processing vessels, high-purity gas storage.
- **Best fit when:** Extreme environmental conditions or purity requirements exist.
**7613.00 – Aluminium**
- **Defining trait:** Lightweight with good strength-to-weight ratio and corrosion resistance.
- **Typical examples:** Portable propane tanks, scuba diving cylinders, aircraft fuel tanks.
- **Best fit when:** Weight is a critical factor (e.g., transport or mobility).
**7806.00 – Lead**
- **Defining trait:** Very dense and soft; not suitable for high pressure due to low strength.
- **Typical examples:** Not typically used for pressurized containers; may appear in obsolete or specialized cases.
- **Best fit when:** Only if the container is non-pressurized or for historical/industrial waste storage.
**7907.00 – Zinc**
- **Defining trait:** Low melting point and moderate strength; not suitable for high-pressure use.
- **Typical examples:** Rarely used in pressurized containers; may appear in sacrificial coatings or low-pressure applications.
- **Best fit when:** Not recommended for pressurized containers; likely a misclassification.
**8007.00 – Tin**
- **Defining trait:** Soft, corrosion-resistant, but very weak under pressure.
- **Typical examples:** Food cans, not used in pressurized systems.
- **Best fit when:** Only if non-pressurized or for packaging, not for actual pressurization.
**8101.99 – Tungsten**
- **Defining trait:** Extremely high melting point and density; used in specialized, high-temperature applications.
- **Typical examples:** Experimental or niche high-temp gas containment (e.g., in labs).
- **Best fit when:** Extreme heat resistance is required, but not common for standard pressurized containers.
**8104 – Magnesium**
- **Defining trait:** Very lightweight but flammable and prone to corrosion; unsafe for most pressurized uses.
- **Typical examples:** Rarely used in pressurized systems; mostly in aerospace components (non-pressure).
- **Best fit when:** Only if the product is non-pressurized or for experimental/low-risk use.
## Key differences
| Material | Strength | Weight | Corrosion Resistance | Pressure Suitability |
|--------|----------|--------|------------------------|------------------------|
| Plastic | Low | Very light | High | Medium (low pressure) |
| Steel | Very high | Heavy | Moderate | Excellent |
| Copper | Medium | Light | High | Good |
| Nickel | High | Medium | Very high | Excellent |
| Aluminium | High | Light | High | Excellent |
| Lead | Very low | Heavy | High | Poor |
| Zinc | Low | Medium | Moderate | Poor |
| Tin | Very low | Medium | High | Poor |
| Tungsten | Extremely high | Very heavy | High | Good (specialized) |
| Magnesium | Low | Very light | Low | Poor |
## How to choose
- Is the container for high-pressure use? → 7311.00, 7613.00, 7508.90
- Is weight a major concern? → 7613.00, 3925.10
- Does it need to resist corrosion or extreme heat? → 7508.90, 7419
- Is it used in aerospace, medical, or chemical industries? → 7508.90, 7613.00
## Overlaps & pitfalls
- Plastic (3925.10) and aluminium (7613.00) are both lightweight and corrosion-resistant—choose based on pressure needs.
- Copper and nickel may overlap in high-corrosion environments; priority depends on temperature or gas type.
- Lead, zinc, tin, and magnesium are generally unsuitable for pressurized containers—avoid unless context confirms non-pressure use.
- **No clear priority** among traits; user must decide based on the product’s MAIN function (e.g., pressure level, mobility, environment)