Home › Chapter 25 › Heading 2528

HS 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 DEFINITION & DISAMBIGUATION

HS Heading 2528 encompasses 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. It classifies 1 6-digit WCO subheadings within Chapter 25 under the Harmonized System [USITC HTS 2026].

Chapter

Ch 25

Heading

2528

Subheadings

1 HS6

Status

Verified 2026

Subheadings Under Heading 2528

HS Code	WCO 6-Digit Subheading Description	Chapter	Operational Package
2528.00	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	25	View 2528.00 Package →

DISAMBIGUATION & CLASSIFICATION GUIDE

How to Select the Correct Subheading Under Heading 2528

Commercial shipments must be declared under the exact 6-digit WCO subheading that matches physical, chemical, or processing characteristics. Review the subheading descriptions above and verify against binding CBP CROSS rulings prior to entry filing.

Official Primary Sources & Authority References

USITC HTS Heading 2528 ↗

United States International Trade Commission official Harmonized Tariff Schedule.

CBP CROSS Rulings ↗

CBP e-Rulings database for Heading 2528 precedent rulings.

WCO Nomenclature ↗

World Customs Organization Harmonized System 2022 nomenclature standard.

U.S. Census Foreign Trade ↗

U.S. Census Bureau HTS-to-NAICS concordance and Schedule B export database.

Heading 2528 Frequently Asked Questions (FAQ)

What commercial articles are grouped under HS Heading 2528?

HS Heading 2528 covers 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, grouping 1 6-digit WCO subheadings.

How are 6-digit subheadings structured under Heading 2528?

Subheadings under Heading 2528 range from 2528.11 to 2528.90, classifying goods by processing state, origin, or material composition.

What is the representative US import duty rate for Heading 2528?

US MFN general duty rates for Heading 2528 commodities range from Duty-Free up to representative ad valorem percentages under the 2026 US HTS.

Are Section 301 tariffs applicable to goods under Heading 2528?

Section 301 additional tariffs depend on the specific 8-digit or 10-digit US HTS code and country of origin (e.g. China Lists 1–4A).

What PGA message set flags apply to Heading 2528?

Partner Government Agency flags (FDA, USDA APHIS, EPA) apply depending on the specific commodity sub-classification.

How do I distinguish between subheadings under Heading 2528?

Review WCO subheading terms and candidate descriptions. For example, unroasted vs. roasted or decaffeinated vs. non-decaffeinated.

Can goods under Heading 2528 enter duty-free under USMCA?

Yes. Goods originating in USMCA territories (US, Mexico, Canada) enter duty-free under SPI code P with a valid Certificate of Origin.

What is the Section 321 de minimis limit for Heading 2528?

Eligible import shipments valued at $800 USD or less imported by one person on one day enter duty-free under 19 U.S.C. 1321.

What documents are required for formal customs entry of Heading 2528?

Commercial Invoice, Packing List, Bill of Lading, and CBP Form 7501 are mandatory for entries exceeding $2,500 USD.

How can an importer get a binding CBP classification ruling for Heading 2528?

Importers may apply for a binding ruling via CBP National Commodity Specialist Division under 19 CFR Part 177.

HS 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