## Common ground
All options are containers designed to hold and transfer liquids or chemicals in laboratory settings, typically used for dropping or dispensing small volumes.
## Options at a glance
**3926.90 – Plastic**
- **Defining trait:** Made from plastic, offering lightweight, impact-resistant, and disposable use.
- **Typical examples:** Polyethylene dropper bottles, single-use pipette tips.
- **Best fit when:** Requiring low cost, disposability, or resistance to minor chemical exposure.
**6903 – Refractory ceramic**
- **Defining trait:** Made from high-temperature-resistant ceramic, suitable for extreme thermal or chemical conditions.
- **Typical examples:** Laboratory crucibles, heat-resistant dispensing vessels.
- **Best fit when:** Used in high-heat environments or with aggressive chemicals.
**6909.1X – Ceramic**
- **Defining trait:** General ceramic material, less heat-resistant than refractory types but still chemically stable.
- **Typical examples:** Porcelain droppers, labware for non-corrosive liquids.
- **Best fit when:** Needing chemical resistance without extreme heat exposure.
**7017 – Glass**
- **Defining trait:** Made from glass, offering high purity, transparency, and excellent chemical resistance.
- **Typical examples:** Glass dropper bottles, burettes, volumetric flasks.
- **Best fit when:** Precision, clarity, or compatibility with sensitive reagents is essential.
## Key differences
| Feature | Plastic (3926.90) | Refractory Ceramic (6903) | Ceramic (6909.1X) | Glass (7017) |
|---------------------|-------------------|----------------------------|--------------------|--------------|
| Heat resistance | Low | Very high | Moderate | High |
| Chemical resistance | Moderate | Very high | High | Very high |
| Transparency | Low (opaque/semi) | None | None | High |
| Reusability | Often disposable | Reusable | Reusable | Reusable |
## How to choose
- Is the container used with strong acids, bases, or high heat? → 6903
- Does it need to be transparent for visual monitoring? → 7017
- Is it meant to be thrown away after one use? → 3926.90
- Is it for general lab use with moderate chemicals and no heat? → 6909.1X
## Overlaps & pitfalls
Plastic (3926.90) may overlap with ceramic/glass if used in non-aggressive settings, but its disposability is key. Glass and ceramic can both be chemically resistant, but glass offers transparency—critical for many lab tasks. If the product is reusable and heat-resistant, prioritize 6903 over 6909.1X. No option is clearly superior; choose based on **main function**: precision → glass, durability/heat → refractory ceramic, cost/disposal → plastic