HS Code for Prussic acid

Prussic acid, scientifically known as hydrogen cyanide (HCN), is classified under HS code 2811.12. This classification falls within Chapter 28, which encompasses inorganic chemicals, precious metals, and rare-earth metals. Specifically, heading 28.11 covers other inorganic acids and other inorganic oxygen compounds of non-metals. Subheading 2811.12 is dedicated to hydrogen cyanide (hydrocyanic acid). The classification is determined by the chemical composition of the substance as a binary compound of hydrogen and nitrogen (with carbon), acting as a weak acid. Because it is a defined chemical compound not containing oxygen (an hydracid), it is excluded from the oxygen-based acid categories and placed specifically under the 2811.12 designation. Proper classification requires that the product is not mixed with other substances unless for preservation or transport safety, as mixtures might shift the classification to Chapter 38 or other sections depending on the intended use. The purity and concentration of the acid are also factors, but for international trade, the chemical identity as hydrogen cyanide is the primary driver for this specific code.

Products Included

• Hydrogen cyanide gas
• Hydrocyanic acid in aqueous solution
• Prussic acid (liquid or gas form)
• Chemical grade hydrogen cyanide for industrial synthesis

Common Misclassification

Prussic acid is frequently confused with other inorganic acids. For instance, Hydrogen chloride is classified under 2806.10, and Hydrogen fluoride falls under 2811.11. Additionally, cyanide salts, such as sodium cyanide, are classified under 2837.11. It is critical to distinguish between the acid form (2811.12) and its metallic salts (2837) to avoid customs delays and regulatory issues regarding hazardous material handling.

FAQ

What is the HS code for Prussic acid?

The HS code for Prussic acid (Hydrogen cyanide) is 2811.12.

Are there special regulations for shipping this product?

Yes, because hydrogen cyanide is highly toxic and volatile, it is subject to strict international transport regulations (IMDG, IATA) and may require specific chemical weapons convention (CWC) declarations depending on the jurisdiction.