## Common ground
All options are types of laboratory desiccators based on their primary construction material.
## Options at a glance
**3926.90 – Plastic**
- **Defining trait:** Made from plastic, typically lightweight and chemically resistant.
- **Typical examples:** Polypropylene or polycarbonate desiccators for general lab use.
- **Best fit when:** Need low weight, impact resistance, or resistance to certain chemicals.
**6903 – Refractory ceramic**
- **Defining trait:** Made from high-temperature-resistant ceramic, suitable for extreme conditions.
- **Typical examples:** Desiccators used in high-heat environments like kiln testing or industrial labs.
- **Best fit when:** Operating at elevated temperatures or requiring thermal stability.
**6909.1X – Ceramic**
- **Defining trait:** Made from standard ceramic, often non-refractory; less heat-resistant than refractory types.
- **Typical examples:** Lab desiccators for routine drying of samples in controlled environments.
- **Best fit when:** Moderate temperature use and high chemical resistance needed.
**7017 – Glass**
- **Defining trait:** Made from glass, offering transparency and excellent chemical inertness.
- **Typical examples:** Borosilicate glass desiccators for precise or sensitive experiments.
- **Best fit when:** Visibility of contents is essential or maximum chemical purity is required.
## Key differences
| Feature | Plastic (3926.90) | Refractory Ceramic (6903) | Ceramic (6909.1X) | Glass (7017) |
|---------------------|-------------------|----------------------------|--------------------|--------------|
| Heat resistance | Low | Very high | Moderate | Moderate |
| Transparency | Opaque/Translucent| Opaque | Opaque | Transparent |
| Chemical resistance | Good | Excellent | High | Excellent |
| Fragility | Low (impact-resistant) | High (brittle) | High | Very high |
## How to choose
- Is the desiccator used in high-temperature environments? → 6903
- Does it need to be transparent for monitoring samples? → 7017
- Is chemical resistance and low weight most important? → 3926.90
- Is moderate heat resistance and durability needed without transparency? → 6909.1X
## Overlaps & pitfalls
- Refractory ceramic (6903) and standard ceramic (6909.1X) may overlap in appearance; the key difference is thermal resistance.
- Plastic and glass both offer chemical resistance, but glass is more inert; plastic may leach under heat or UV.
- If unsure, prioritize the **main function**: use glass for visibility, refractory ceramic for heat, plastic for durability, standard ceramic for balance