HEADING 2811

Other inorganic acids and other inorganic oxygen compounds of nonmetals:

Part of Chapter 28 — Inorganic Chemicals, Section VI.

Subheadings and tariff lines

2811D01Other inorganic acids:
2811.11.00.00Hydrogen fluoride (Hydrofluoric acid) 2811.12.00.00Hydrogen cyanide (hydrocyanic acid) 2811.19Other: 2811.19.10.00Arsenic acid 2811.19.30.00Hydrobromic acid 2811.19.61Other 2811.19.61.10Sulfamic acid 2811.19.61.90Other
2811D02Other inorganic oxygen compounds of nonmetals:
2811.21.00.00Carbon dioxide 2811.22Silicon dioxide: 2811.22.10.00Synthetic silica gel 2811.22.50.00Other 2811.29Other: 2811.29.10.00Arsenic trioxide 2811.29.20.00Selenium dioxide 2811.29.30.00Sulfur dioxide 2811.29.50.00Other
2811D03III. HALOGEN OR SULFUR COMPOUNDS OF NONMETALS

Recent CBP rulings on heading 2811

N358616 March 4, 2026

The tariff classification of Propylene, Monochlorosilane, and Nitric Oxide from South Korea
H332948 August 25, 2025

Request for Further Review of Protest Number 1601-21-105798; Classification; Applicability of Section 301 Trade Remedies; Silica Gel.
N344646 January 3, 2025

The tariff classification of Hypophosphorous Acid from India
H331516 June 21, 2023

Tariff classification of CO2 cartridges; AFR/Protest No. 2704-23-164523
H320777 December 16, 2022

Request for reconsideration of NY N311593; tariff classification of non-powder gun propellant CO2 cartridges
N311593 May 22, 2020

The tariff classification of “CO2 propellant cartridges” from China
N306472 October 24, 2019

The tariff classification of Scandium Oxide, Silicon Dioxide, and Silicon Monoxide from China
N304913 July 16, 2019

The tariff classification of Kleer Drain Replacement Pack from China.
N273909 April 7, 2016

The tariff classification of Nitrous Oxide (CAS # 10024-97-2) from Mexico
N272050 February 12, 2016

The tariff classification of “Dinitrogen Tetroxide (Nitrogen Dioxide) CAS #10102-44-0” from France
H237643 July 16, 2015

Modification of NY J83810; Tariff classification of two samples of silicon dioxide “C-Gel”, synthetic silica gel, from Switzerland
N248583 January 6, 2014

The tariff classification of synthetic amorphous silicon dioxide from Japan

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