# HTS 3818: Chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics

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Source: [2026 HTS Revision 21 (October 9, 2026)](https://hts.usitc.gov/search?query=3818). Additional duties by country of origin may apply; estimate a shipment's full duty with the tariff calculator: https://geopax.app/tariffs/calculator

## 3818: Chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics

| Code | Description | General | Special | Column 2 | Units |
| --- | --- | --- | --- | --- | --- |
| 3818.00.00 | Chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics | Free |  | 25% |  |
| 3818.00.00.10 |   Gallium arsenide wafers, doped | Free |  | 25% | kg |
| 3818.00.00.20 |   Polycrystalline silicon wafers, doped | Free |  | 25% | kg |
| 3818.00.00.30 |   Silicon carbide wafers, doped | Free |  | 25% | kg |
|  |   Monocrystalline silicon wafers, doped: | Free |  | 25% |  |
| 3818.00.00.40 |     Round (circular) shaped, as described in statistical note 2 to this chapter | Free |  | 25% | kg |
| 3818.00.00.45 |     Pseudo-square or rectangular in shape, as described in statistical note 3 to this chapter | Free |  | 25% | kg |
| 3818.00.00.50 |     Other | Free |  | 25% | kg |
| 3818.00.00.91 |   Other | Free |  | 25% | kg |