Heading 2811

Other inorganic acids and other inorganic oxygen compounds of nonmetals

13 declarable lines

Heading 2811 covers other inorganic acids and other inorganic oxygen compounds of nonmetals, grouped in two ways. The first part covers inorganic acids such as hydrogen fluoride, hydrogen cyanide, arsenic acid, hydrobromic acid and sulfamic acid. The second part covers inorganic oxygen compounds of nonmetals such as carbon dioxide, silicon dioxide and sulfur dioxide.

Products in this heading

Hydrofluoric acid (hydrogen fluoride)
Hydrogen cyanide (hydrocyanic acid)
Arsenic acid
Hydrobromic acid
Sulfamic acid
Carbon dioxide
Synthetic silica gel
Sulfur dioxide

How to choose the right subheading

Decide first whether the product is an inorganic acid or an inorganic oxygen compound of a nonmetal; that splits the heading into its two groups.
For acids, check whether the specific acid is named, such as hydrogen fluoride, hydrogen cyanide, arsenic acid or hydrobromic acid.
For acids not named, such as sulfamic acid, use the residual acid subheading.
For oxygen compounds, identify the specific compound: carbon dioxide, silicon dioxide, arsenic trioxide, selenium dioxide or sulfur dioxide.
For silicon dioxide, distinguish synthetic silica gel from other forms, since the rates differ.

Often confused with

Hydrochloric acid
It is a separate acid named in heading 2806, not an other inorganic acid of 2811.
Heading 2806
Phosphoric acid
Covered by heading 2809 with diphosphorus pentaoxide and polyphosphoric acids.
Heading 2809
Ammonia
A nonmetal nitrogen compound with hydrogen, not an acid or oxygen compound of a nonmetal.
Heading 2814
Silicon dioxide as quartz or natural sand
The heading covers prepared inorganic oxygen compounds; natural mineral forms are classified elsewhere depending on presentation.
Sodium hydroxide
A metal hydroxide, not an acid or oxygen compound of a nonmetal.
Heading 2815

Frequently asked questions

What is the HTS code for hydrogen fluoride?

Hydrogen fluoride (hydrofluoric acid) is classified under 2811.11.00.00, with a general (MFN) rate of Free.

What is the duty on silicon dioxide?

Synthetic silica gel under 2811.22.10.00 carries a general (MFN) rate of 3.7%, while other silicon dioxide under 2811.22.50.00 is Free.

How do I classify sulfamic acid?

Sulfamic acid is not named separately, so it falls under the residual acid subheading 2811.19.61.10, with a general (MFN) rate of 4.2%.

Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.