## Common ground
All options are types of hot water bottles based on their material composition.
## Options at a glance
**3924.90,3926.90 – Made of plastic material**
- **Defining trait:** Flexible, lightweight, and typically molded from synthetic polymers like polyethylene or PVC.
- **Typical examples:** Disposable or reusable plastic hot water bottles with rubber stoppers.
- **Best fit when:** You need a low-cost, lightweight, and shatterproof option for home use.
**4014.90 – Made of rubber**
- **Defining trait:** Flexible, durable, and often used in traditional or insulated designs; may include a fabric cover.
- **Typical examples:** Classic rubber hot water bottles with a leather or fabric sleeve.
- **Best fit when:** You want a long-lasting, heat-retaining bottle with a traditional feel.
**6911.90 – Made of porcelain or china**
- **Defining trait:** Rigid, brittle, and often decorative; not commonly used for hot water bottles due to fragility.
- **Typical examples:** Antique or ornamental ceramic vessels used as hot water containers in historical contexts.
- **Best fit when:** You’re describing a rare, decorative item with historical or collectible value.
**6912.00 – Made of ceramic**
- **Defining trait:** Similar to porcelain but often more porous; less common for hot water bottles due to thermal stress risk.
- **Typical examples:** Handmade ceramic vessels used in traditional settings, not mass-produced.
- **Best fit when:** The product is a handmade or artistic ceramic vessel intended for heating.
**7013.10,7013.4X – Made of glass**
- **Defining trait:** Transparent, fragile, and requires protective casing; used in some modern designs for visibility.
- **Typical examples:** Glass hot water bottles with a fabric or metal sleeve for safety.
- **Best fit when:** You need a clear, reusable bottle with visible water level and aesthetic appeal.
**7323.9X – Made of iron or steel**
- **Defining trait:** Heavy, durable, and excellent at retaining heat; often used in industrial or camping contexts.
- **Typical examples:** Metal thermos flasks or insulated steel containers for hot water.
- **Best fit when:** You need a robust, long-lasting, high-heat-retention container.
## Key differences
| Material | Flexibility | Heat retention | Fragility | Common use |
|--------------|-------------|----------------|-----------|----------------------|
| Plastic | High | Low | Low | Everyday home use |
| Rubber | High | Medium | Low | Traditional, reusable|
| Porcelain/Ceramic | Low | Medium-High | High | Decorative/historical|
| Glass | Low | Medium | Very high | Aesthetic, visible |
| Iron/Steel | None | High | Low | Heavy-duty, camping |
## How to choose
- Is the bottle flexible and lightweight? → 3924.90,3926.90
- Is it made of rubber with a fabric cover? → 4014.90
- Is it transparent and fragile? → 7013.10,7013.4X
- Is it heavy and metallic? → 7323.9X
- Is it decorative or antique-looking? → 6911.90 or 6912.00
## Overlaps & pitfalls
- Glass and ceramic bottles may look similar; glass is transparent, ceramic often opaque.
- Rubber and plastic bottles can both be flexible—check for material texture and smell.
- Porcelain and ceramic are often confused; porcelain is smoother and more vitrified.
- No clear priority: choose based on the product’s **main function** (e.g., daily use vs. decoration)