HS Heading 2931 : Other organo-inorganic compounds
HEADING DEFINITION & DISAMBIGUATION
HS Heading 2931 encompasses other organo-inorganic compounds. It classifies 17 6-digit WCO subheadings within Chapter 29 under the Harmonized System [USITC HTS 2026].
Subheadings Under Heading 2931
| HS Code | WCO 6-Digit Subheading Description | Chapter | Operational Package |
|---|---|---|---|
| 2931.10 | Other organo-inorganic compounds, Tetramethyl lead and tetraethyl lead | 29 | View 2931.10 Package → |
| 2931.20 | Tributyltin compounds | 29 | View 2931.20 Package → |
| 2931.41 | Non-halogenated organo-phosphorous derivatives, Dimethyl methylphosphonate | 29 | View 2931.41 Package → |
| 2931.42 | Non-halogenated organo-phosphorous derivatives, Dimethyl propylphosphonate | 29 | View 2931.42 Package → |
| 2931.43 | Non-halogenated organo-phosphorous derivatives, Diethyl ethylphosphonate | 29 | View 2931.43 Package → |
| 2931.44 | Non-halogenated organo-phosphorous derivatives, Methylphosphonic acid | 29 | View 2931.44 Package → |
| 2931.45 | Non-halogenated organo-phosphorous derivatives, Salt of methylphosphonic acid and (aminoiminomethyl)urea (1:1) | 29 | View 2931.45 Package → |
| 2931.46 | Non-halogenated organo-phosphorous derivatives, 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide | 29 | View 2931.46 Package → |
| 2931.47 | Non-halogenated organo-phosphorous derivatives, (5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate | 29 | View 2931.47 Package → |
| 2931.48 | Non-halogenated organo-phosphorous derivatives, 3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane 3,9-dioxide | 29 | View 2931.48 Package → |
| 2931.49 | Non-halogenated organo-phosphorous derivatives, Other | 29 | View 2931.49 Package → |
| 2931.51 | Halogenated organo-phosphorous derivatives, Methylphosphonic dichloride | 29 | View 2931.51 Package → |
| 2931.52 | Halogenated organo-phosphorous derivatives, Propylphosphonic dichloride | 29 | View 2931.52 Package → |
| 2931.53 | Halogenated organo-phosphorous derivatives, O-(3-chloropropyl) O-[4-nitro-3-(trifluoromethyl)phenyl] methylphosphonothionate | 29 | View 2931.53 Package → |
| 2931.54 | Halogenated organo-phosphorous derivatives, Trichlorfon (ISO) | 29 | View 2931.54 Package → |
| 2931.59 | Halogenated organo-phosphorous derivatives, Other | 29 | View 2931.59 Package → |
| 2931.90 | Other | 29 | View 2931.90 Package → |
DISAMBIGUATION & CLASSIFICATION GUIDE
How to Select the Correct Subheading Under Heading 2931
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 2931 ↗
United States International Trade Commission official Harmonized Tariff Schedule.
CBP CROSS Rulings ↗
CBP e-Rulings database for Heading 2931 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 2931 Frequently Asked Questions (FAQ)
What commercial articles are grouped under HS Heading 2931?
HS Heading 2931 covers Other organo-inorganic compounds, grouping 17 6-digit WCO subheadings.
How are 6-digit subheadings structured under Heading 2931?
Subheadings under Heading 2931 range from 2931.11 to 2931.90, classifying goods by processing state, origin, or material composition.
What is the representative US import duty rate for Heading 2931?
US MFN general duty rates for Heading 2931 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 2931?
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 2931?
Partner Government Agency flags (FDA, USDA APHIS, EPA) apply depending on the specific commodity sub-classification.
How do I distinguish between subheadings under Heading 2931?
Review WCO subheading terms and candidate descriptions. For example, unroasted vs. roasted or decaffeinated vs. non-decaffeinated.
Can goods under Heading 2931 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 2931?
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 2931?
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 2931?
Importers may apply for a binding ruling via CBP National Commodity Specialist Division under 19 CFR Part 177.