## Common ground
All options are types of laboratory dialyzers based on their material composition.
## Options at a glance
**3926.90 – Plastic**
- **Defining trait:** Made from plastic, offering lightweight, low-cost, and disposable use.
- **Typical examples:** Disposable dialysis cassettes, single-use lab dialyzers.
- **Best fit when:** Reusable or short-term experiments where cost and ease of disposal matter.
**6903 – Refractory ceramic**
- **Defining trait:** Made from heat-resistant, chemically stable ceramics for high-temperature or corrosive environments.
- **Typical examples:** Industrial-scale dialyzers in harsh chemical processes.
- **Best fit when:** High-temperature or highly corrosive lab conditions; not typical for standard labs.
**6909.1X – Ceramic**
- **Defining trait:** Made from general-purpose ceramic, often non-refractory, with moderate durability and chemical resistance.
- **Typical examples:** Lab dialyzers used in routine separations with mild chemicals.
- **Best fit when:** Standard lab use requiring moderate durability and chemical resistance.
**7017 – Glass**
- **Defining trait:** Made from glass, offering transparency, high chemical purity, and excellent visibility during experiments.
- **Typical examples:** Benchtop dialyzers for protein purification, visible process monitoring.
- **Best fit when:** Need for visual observation, high purity, or non-reactive surfaces is critical.
## Key differences
| Feature | Plastic (3926.90) | Refractory Ceramic (6903) | Ceramic (6909.1X) | Glass (7017) |
|---------------------|-------------------|----------------------------|--------------------|--------------|
| Transparency | No | No | No | Yes |
| Chemical resistance | Moderate | Very high | Moderate | Very high |
| Heat resistance | Low | Very high | Medium | Medium |
| Reusability | Often disposable | High | Medium | High |
## How to choose
- Is transparency needed for monitoring the process? → 7017
- Is the material used in harsh chemical or high-temp conditions? → 6903
- Is low cost and disposability most important? → 3926.90
- Is moderate durability and chemical resistance sufficient? → 6909.1X
## Overlaps & pitfalls
- Glass (7017) and ceramic (6909.1X) both offer high chemical resistance but differ in transparency and brittleness.
- Refractory ceramic (6903) is a subset of ceramic; use only if extreme conditions apply.
- "Ceramic" (6909.1X) is vague—may include non-refractory types. If heat or corrosion is key, prioritize 6903.
- No priority rule given: choose based on the product’s **main function**—e.g., visibility vs. durability vs. cost