Heading 2528: Natural borates and concentrates thereof (whether or not calcined), but not including…
Every line of heading 2528 in the U.S. Harmonized Tariff Schedule, with its general (column 1) duty rate. Open a code for the landed cost calculator, trade agreement rates and email alerts if the rate changes.
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
Chapter 25: Salt; sulfur; earths and stone; plaster, lime and cement. Schedule checked on November 8, 2026.
Not always the total: additional chapter 99 duties (such as Section 232 or Section 301), antidumping or countervailing duties may apply depending on the country of origin. See recent chapter 99 changes →
Tariff lines
| HTS code | Official description | General rate |
|---|---|---|
| 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 |
| 2528.00.00.05 | Natural sodium borates and concentrates thereof (whether or not calcined) | |
| 2528.00.00.10 | Natural calcium borates | |
| 2528.00.00.50 | Other |
Exporting this product from the U.S.?
Exports are reported with Schedule B numbers. Heading 2528 has 2 of them. Schedule B lookup →
- 2528.00.1000NATURAL SODIUM BORATES AND CONCENTRATES THEREOF (WHETHER OR NOT CALCINED)
- 2528.00.9000NATURAL BORATES (OTHER THAN SODIUM BORATES) AND CONCENTRATES THEREOF,NATURAL BORIC ACID CONTAINING NOT MORE THAN 85 PCT H3B03
Source: U.S. International Trade Commission, Harmonized Tariff Schedule; Schedule B: U.S. Census Bureau. Information only, not legal or customs advice; U.S. Customs and Border Protection decides the classification and the duty. Confirm with a licensed customs broker before you ship.
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