## Common ground
All options describe electric devices that generate and diffuse ozone gas for industrial or technical applications.
## Options at a glance
**8486.20 – Semiconductor manufacturing**
- **Defining trait:** Designed specifically for use in semiconductor or integrated circuit fabrication processes.
- **Typical examples:** Ozone-in-water generators used in wafer cleaning, photoresist removal.
- **Best fit when:** The device is used in microelectronics production with strict purity and process control requirements.
**8486.30 – Flat panel display manufacturing**
- **Defining trait:** Tailored for use in the production of flat panel displays (e.g., LCD, OLED).
- **Typical examples:** Ozone generators for surface treatment or cleaning during display panel fabrication.
- **Best fit when:** The apparatus is integrated into a display manufacturing line with process-specific needs.
**8543.70 – General industrial ozonation**
- **Defining trait:** Intended for non-medical, general-purpose ozone application (e.g., air/water purification, odor control).
- **Typical examples:** Ozone diffusers for disinfecting rooms, treating wastewater, or sterilizing equipment.
- **Best fit when:** The device is used in broad industrial settings without specialized semiconductor or display process integration.
## Key differences
| Feature | 8486.20 (Semiconductors) | 8486.30 (Displays) | 8543.70 (General Use) |
|--------------------------|---------------------------|--------------------|------------------------|
| Primary industry | Microelectronics | Display manufacturing | General industrial |
| Process specificity | High | Medium | Low |
| Typical environment | Cleanroom | Production line | Factory, lab, facility |
## How to choose
- Is the device used in semiconductor or IC fabrication? → 8486.20
- Is it used specifically in flat panel display production? → 8486.30
- Is it for general air/water treatment, disinfection, or odor control? → 8543.70
## Overlaps & pitfalls
A device may serve multiple purposes (e.g., ozone for both cleanroom use and water treatment), but the **primary function** determines the correct code. If used in semiconductor manufacturing, even if it also purifies air, prioritize 8486.20. No option is vague—each reflects a distinct industrial application. Use the main process purpose to decide