2528.00.00.05
Natural sodium borates and concentrates thereof (whether or not calcined)
Classification path
- 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
- Natural sodium borates and concentrates thereof (whether or not calcined)
Rates of duty
- General (MFN)
- Free
- Column 2Cuba, North Korea, Russia, Belarus
- Free
- Unit of quantity
- kg
Related lines in heading 2528
About heading 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
Heading 2528 covers natural borate ores and concentrates, whether or not calcined, and natural boric acid that contains no more than 85% H3BO3 on a dry weight basis. It does not cover borates that have been separated from natural brine or otherwise refined chemically. The heading splits by the metal in the borate: sodium borates, calcium borates, and a residual other line. All three lines carry a general (MFN) duty of Free.
Full guide to heading 2528Products in this heading
- Tincal (natural sodium borate ore)
- Borax ore concentrates, including calcined material
- Colemanite (natural calcium borate)
- Priceite and other natural calcium borate ores
- Natural boric acid of 85% or less H3BO3 on dry weight
- Crude borate ore that has been washed and concentrated but not refined
Frequently asked questions
What is the HTS code for natural sodium borates?
Natural sodium borates and concentrates thereof, whether or not calcined, are classified under 2528.00.00.05, with a general (MFN) duty of Free.
What is the duty on natural calcium borates?
Natural calcium borates enter under 2528.00.00.10 and the general (MFN) rate is Free.
How do I classify calcined borate ore that is not sodium or calcium borate?
Calcination does not move the goods out of the heading, so such material falls to the residual line 2528.00.00.50, which carries a general (MFN) duty of Free.
Source: USITC Harmonized Tariff Schedule, retrieved October 22, 2026.