Harmonized Tariff Schedule of the U.S. › Chapter 25 Salt; sulphur; earths and stone; plastering materials, lime and cement
2528.00.00.10Tariff line
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 H3 BO3 calculated on the dry weight
2528
Natural calcium borates
2528.00.00.10
Rates of duty
General rate (Column 1)Free
Special—
Column 2Free
Unitkg
Printed page 1354
Measure flags
for origin CN, entry date 2026-10-26 · base rate Free
- Section 301 forced-labor tariff (12.5%)9903.05.31Applies+12.5%China: Column 1 rate + 12.5% additional
- China 301 List 3 (9903.88.03)9903.88.03Applies+25%8-digit subheading 2528.00.00 is on L3
Confirmed total 37.5% · max 37.5%Full duty breakdown →