# HTS 2528: Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight

https://geopax.app/tariffs/catalog/25/2528

Source: [2026 HTS Revision 21 (October 9, 2026)](https://hts.usitc.gov/search?query=2528). Additional duties by country of origin may apply; estimate a shipment's full duty with the tariff calculator: https://geopax.app/tariffs/calculator

## 2528: Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight

| Code | Description | General | Special | Column 2 | Units |
| --- | --- | --- | --- | --- | --- |
| 2528.00.00 | Natural borates and concentrates thereof (whether or not calcined), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight | Free |  | Free |  |
| 2528.00.00.05 |   Natural sodium borates and concentrates thereof (whether or not calcined) | Free |  | Free | kg |
| 2528.00.00.10 |   Natural calcium borates | Free |  | Free | kg |
| 2528.00.00.50 |   Other | Free |  | Free | kg |