Hydrogen cyanide (hydrocyanic acid)
Other inorganic acids and other inorganic oxygen compounds of nonmetals: > Other inorganic acids: > Hydrogen cyanide (hydrocyanic acid)
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 2811.12.00.00
Hydrogen Cyanide Gas (99% Purity)
Hydrogen cyanide (HCN) is a highly toxic, colorless gas or volatile liquid used primarily in chemical synthesis for producing adiponitrile and methionine. It falls under HTS 2811.12.00.00 as it is explicitly listed as hydrocyanic acid, a simple cyanogen acid per Chapter 28 Note 2(a). This chemically defined inorganic compound is supplied in pressurized cylinders for industrial applications.
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. Classified under HTS 2811.12.00.00 as hydrocyanic acid, meeting the definition of chemically defined inorganic acids of nonmetals. The solution retains the chemical identity of HCN despite water dilution.
Anhydrous Hydrogen Cyanide (Industrial Grade)
Pure anhydrous HCN liquid/gas for large-scale production of nylon precursors and pharmaceuticals, supplied in refrigerated tankers. It is explicitly covered by HTS 2811.12.00.00 as hydrogen cyanide, a key inorganic oxygen compound of nonmetals listed in Chapter Note 2(a). High purity (99.5%+) distinguishes it for chemical synthesis.
Stabilized Hydrocyanic Acid for Fumigation (5% Solution)
Phosphine-stabilized 5% HCN aqueous solution packaged for agricultural fumigation of soil and structures. Falls under HTS 2811.12.00.00 as chemically defined hydrogen cyanide despite stabilization, as inorganic per Chapter 28 definitions. Supplied in 55-gallon drums for professional pest control.
High-Purity HCN for Adiponitrile Production
Ultra-pure hydrogen cyanide (99.9%) distilled for electrohydrodimerization to adiponitrile in nylon-6,6 manufacturing. Classified precisely under HTS 2811.12.00.00 as the simple cyanogen acid HCN per Chapter Note 2(a). Delivered via insulated stainless steel tankers.
HCN Laboratory Reagent Grade
Small-quantity reagent grade hydrogen cyanide in stabilized ampoules for analytical chemistry and organic synthesis research. HTS 2811.12.00.00 applies as chemically defined hydrocyanic acid for lab use. Packaged under 1 liter per UN-approved container.