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HS Heading 6903 : Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of similar siliceous earths

HEADING DEFINITION & DISAMBIGUATION

HS Heading 6903 encompasses other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of similar siliceous earths. It classifies 3 6-digit WCO subheadings within Chapter 69 under the Harmonized System [USITC HTS 2026].

Chapter

Ch 69

Heading

6903

Subheadings

3 HS6

Status

Verified 2026

Subheadings Under Heading 6903

HS Code	WCO 6-Digit Subheading Description	Chapter	Operational Package
6903.10	Containing by weight more than 50 percent of free carbon	69	View 6903.10 Package →
6903.20	Containing by weight more than 50 percent of alumina (Al₂O₃) or of a mixture or compound of alumina and of silica (SiO₂)	69	View 6903.20 Package →
6903.90	Other	69	View 6903.90 Package →

DISAMBIGUATION & CLASSIFICATION GUIDE

How to Select the Correct Subheading Under Heading 6903

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 6903 ↗

United States International Trade Commission official Harmonized Tariff Schedule.

CBP CROSS Rulings ↗

CBP e-Rulings database for Heading 6903 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 6903 Frequently Asked Questions (FAQ)

What commercial articles are grouped under HS Heading 6903?

HS Heading 6903 covers Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of similar siliceous earths, grouping 3 6-digit WCO subheadings.

How are 6-digit subheadings structured under Heading 6903?

Subheadings under Heading 6903 range from 6903.11 to 6903.90, classifying goods by processing state, origin, or material composition.

What is the representative US import duty rate for Heading 6903?

US MFN general duty rates for Heading 6903 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 6903?

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 6903?

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

How do I distinguish between subheadings under Heading 6903?

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

Can goods under Heading 6903 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 6903?

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 6903?

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 6903?

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