Chapter 2811 — Customs Tariff Headings

48% Hydrofluoric Acid Solution

A standard industrial grade of hydrofluoric acid at 48% concentration in water, used for etching glass and semiconductors. The solution is a normal and necessary method of putting up hydrogen fluoride for safety and transport, and the water does not render the product particularly suitable for specific use rather than for general use.

70% Hydrogen Fluoride Industrial Grade

A high-concentration 70% HF solution for heavy-duty applications like aluminum etching in manufacturing. It is explicitly hydrogen fluoride, meeting Chapter 28 note for inorganic acids of non-metals. The water solution is a normal method of putting up for safety and transport.

Aluminum Brightener HF Solution

An HF-based pickling solution for aluminum surface preparation in metal finishing. The primary active ingredient is hydrogen fluoride, and the solution is classified as hydrogen fluoride under tariff item 2811.11.00. Bulk imported for anodizing lines.

Anhydrous HF Gas Cylinder

Compressed anhydrous hydrogen fluoride gas in steel cylinders for fluorination reactions. Strictly pure hydrogen fluoride, an inorganic non-metal acid. Used in chemical synthesis plants.

Anhydrous Hydrogen Fluoride

Pure anhydrous hydrogen fluoride (HF) is a colorless, corrosive gas or liquid used primarily in industrial processes like fluorochemical production. It falls under tariff item 2811.11.00 as it is the specific inorganic acid.

Buffered Hydrofluoric Acid (BHF)

Buffered HF solution typically 6:1 HF:NH4F for silicon dioxide etching in microelectronics. Primarily hydrogen fluoride, thus classified under tariff item 2811.11.00 per Chapter 28 inorganic acids note, despite buffering. Imported for precision etching.

Corrosion Inhibited HF

HF with proprietary inhibitors for safe stainless steel handling in oilfield applications. Still hydrogen fluoride dominant for classification under tariff item 2811.11.00. Drummed for the energy sector.

Electronic Grade Hydrofluoric Acid (HF)

Ultra-pure hydrofluoric acid for semiconductor wafer cleaning, with impurities below ppb levels. Falls under tariff item 2811.11.00 as chemically defined hydrogen fluoride for inorganic acid category in Chapter 28. Packaged in high-purity containers.

Fluorspar Derived HF

Hydrogen fluoride produced from fluorspar (CaF2) reaction, 99% purity for refrigerant synthesis. Pure HF qualifies for tariff item 2811.11.00 per Chapter 28 chemical definition. Gaseous or liquid form.

Glass Etching Hydrofluoric Acid

20-30% HF solution specialized for frosted glass production and decorative etching. It is hydrogen fluoride per tariff item 2811.11.00, as the defining inorganic acid component. Commonly imported for architectural and automotive glass.

High Purity Anhydrous HF

99.99% anhydrous HF for advanced fluoropolymer and pharma synthesis. Classified under tariff item 2811.11.00 as pure inorganic hydrogen fluoride. Specialized monel or Teflon vessels.

Lab Grade Hydrofluoric Acid

ACS reagent grade HF for analytical chemistry and research labs, typically 48-50%. Chemically defined hydrogen fluoride under tariff item 2811.11.00, excluding lab mixtures per notes. In 500mL plastic bottles.

Pharma Grade Hydrofluoric Acid

High-purity HF meeting USP standards for pharmaceutical fluoride production and synthesis. Classified as hydrogen fluoride under tariff item 2811.11.00, chemically defined inorganic acid excluding organo-inorganics per Chapter 28.

Semiconductor Cleaning HF

Dilute 0.5% HF for native oxide removal in wafer fabrication. Remains hydrogen fluoride under tariff item 2811.11.00 due to chemical definition in Chapter 28. Shipped in high-purity Teflon bottles.

Technical Grade 50% Hydrofluoric Acid

50% HF technical grade for general industrial cleaning and chemical intermediate production. Classified under tariff item 2811.11.00 for hydrogen fluoride as defined inorganic acid. Standard in 55-gallon drums.

Anhydrous Hydrogen Cyanide (Industrial Grade)

Anhydrous hydrogen cyanide (HCN) in industrial grade, supplied as a liquid or gas for large-scale production of nylon precursors and pharmaceuticals. It is a separate chemically defined compound of carbon and nitrogen, classified under this tariff item as hydrogen cyanide (hydrocyanic acid).

HCN Laboratory Reagent Grade

Laboratory reagent grade hydrogen cyanide in stabilized ampoules for analytical chemistry and organic synthesis. It is a chemically defined compound of hydrogen cyanide, meeting the criteria for this tariff item as a separate inorganic acid.

High-Purity HCN for Adiponitrile Production

Ultra-pure hydrogen cyanide (99.9% purity) distilled for electrohydrodimerization to adiponitrile in nylon-6,6 manufacturing. It is a separate chemically defined compound of hydrogen cyanide, classified under this tariff item as a simple cyanogen acid.

Hydrocyanic Acid Aqueous Solution (10% HCN)

An aqueous solution of hydrogen cyanide stabilized at 10% concentration for safer handling in industrial fumigation and chemical processes. It is a solution of a chemically defined compound in water, covered by this tariff item as hydrogen cyanide.

Hydrogen Cyanide Gas (99% Purity)

Hydrogen cyanide gas at 99% purity, used primarily in chemical synthesis for producing adiponitrile and methionine. It is a separate chemically defined compound of hydrogen cyanide, classified under this tariff item as a simple cyanogen acid.

Stabilized Hydrocyanic Acid for Fumigation (5% Solution)

Phosphine-stabilized 5% HCN aqueous solution packaged for agricultural fumigation of soil and structures. It is a solution of hydrogen cyanide in water with a stabilizer for safety, falling under this tariff item as hydrogen cyanide.

33% Hydrobromic Acid in Acetic Acid

A 33% hydrobromic acid solution in glacial acetic acid is a chemically defined inorganic acid, but the solvent is not water. Under Chapter Note 1(c), it qualifies if the acetic acid is a normal and necessary method of putting up for safety or transport and does not render the product suitable for specific use.

48% Hydrobromic Acid Solution

A 48% aqueous solution of hydrogen bromide gas (HBr) is a chemically defined inorganic acid in water. It is classified under this tariff item as an other inorganic acid of a non-metal, per Chapter Note 1(b).

Anhydrous Hydrobromic Acid Gas Cylinder

Anhydrous HBr gas in steel cylinders is a chemically defined inorganic acid in gaseous form. It is classified under this tariff item as an other inorganic acid of a non-metal, as it is not excluded by Chapter Notes.

Arsenic Acid Anhydride Powder

Anhydrous arsenic acid powder, also known as arsenic pentoxide when dehydrated, is a chemically defined inorganic compound used in electronics etching. It is classified as an inorganic acid of a non-metal under Chapter 28, meeting the criteria of Note 1(a) to Chapter 28.

Arsenic Acid for Flame Retardant Synthesis

Purified arsenic acid used for synthesizing flame retardants in plastics is a chemically defined inorganic acid. It is not a finished flame retardant product, so it falls under this tariff item as an other inorganic acid of a non-metal.

Arsenic Acid H3AsO4 (99% Purity)

Arsenic acid (H3AsO4) at 99% purity is a colorless to white crystalline solid used in chemical synthesis and as a reagent. It is a separate chemically defined compound of a non-metal, qualifying under this tariff item.

Arsenic Pentoxide Solution (50% Aqueous)

An aqueous solution of arsenic pentoxide (As2O5), equivalent to arsenic acid, is used in glass manufacturing and wood preservation. As a solution of a chemically defined inorganic compound in water, it falls under this tariff item per Chapter Note 1(b).

Battery-Grade Arsenic Acid Electrolyte

Ultra-pure arsenic acid for specialty battery electrolytes is a chemically defined inorganic acid. It is not a finished electrolyte, so it is classified under this tariff item as an other inorganic acid.

Fuming Hydrobromic Acid 55%

Fuming 55% hydrobromic acid that emits HBr vapors is a chemically defined inorganic acid. It is classified under this tariff item as an other inorganic acid, provided it is in aqueous solution.

High-Purity Arsenic Acid for Glass Production

High-purity H3AsO4 used as a fining agent in optical glass manufacturing is a chemically defined inorganic acid. It is not excluded by Chapter Note 3(d) as it is not a luminophore, so it falls under this tariff item.

Hydrobromic Acid 47-52% Semiconductor Grade

Ultra-pure hydrobromic acid (47-52% assay) for semiconductor manufacturing is a chemically defined inorganic acid in aqueous solution. It is classified under this tariff item as an other inorganic acid.

Industrial Arsenic Acid 75% Solution

A 75% aqueous industrial arsenic acid solution for wood treatment and textile dyeing processes is a chemically defined inorganic acid in water. It qualifies under this tariff item as an other inorganic acid of a non-metal.

Laboratory Reagent Arsenic Acid (ACS Grade)

ACS-grade arsenic acid for analytical chemistry and lab research meets high purity standards as a chemically defined inorganic acid. It is not an organo-inorganic compound, so it falls under this tariff item.

Meta-Arsenic Acid Flakes

Meta-arsenic acid (HAsO2) flakes, a polymeric form used in pharmaceutical intermediates, is a chemically defined inorganic acid. It is classified under this tariff item as an other inorganic acid of a non-metal.

Technical Grade Arsenic Acid Crystals

Technical grade arsenic acid (H3AsO4) crystals for industrial applications like pesticide intermediates and flame retardants is a chemically defined inorganic acid. It qualifies under this tariff item as an other inorganic acid.

Dry Ice Blocks for Shipping

Dry ice is the solid phase of carbon dioxide, a separate chemically defined compound of non-metal oxygen. It is classified under tariff item 2811.21.00 as carbon dioxide, regardless of physical state, and is not excluded by Chapter 28 notes.

Food-Grade CO2 for Beverage Carbonation

Food-grade carbon dioxide is a pure, chemically defined inorganic compound of carbon and oxygen, meeting Chapter 28 note 1 criteria. It falls under tariff item 2811.21.00 as carbon dioxide, even when used in beverages.

Industrial Carbon Dioxide Gas Cylinder

Industrial carbon dioxide gas in cylinders is a separate chemically defined compound, classifiable under tariff item 2811.21.00. The steel cylinder is packaging, not a separate good, and does not affect classification.

Laboratory Carbon Dioxide 99.999% Pure

Ultra-high purity laboratory carbon dioxide is a separate chemically defined compound, meeting Chapter 28 note 1(a). It is classifiable under tariff item 2811.21.00, with no exclusions for laboratory use.

Liquid Carbon Dioxide Bulk Tanker

Liquid carbon dioxide in bulk tankers is carbon dioxide in a liquid state, a separate chemically defined compound. It falls under tariff item 2811.21.00, as the heading covers all physical states of CO2.

Medical-Grade Carbon Dioxide USP

Medical-grade carbon dioxide USP is a pure, chemically defined compound of carbon and oxygen, classifiable under tariff item 2811.21.00. Chapter 28 notes do not exclude pharmaceutical-grade inorganic compounds unless put up as medicaments (Chapter 30).