Chapter 2837 — Customs Tariff Headings
Products classified under Tariff item 28.37
High-Purity Sodium Cyanide for Organic Synthesis
High-purity sodium cyanide (NaCN) in ACS reagent grade, used as a reagent in organic synthesis to produce pharmaceutical intermediates. It is a separate chemically defined compound of sodium, meeting the criteria of Chapter 28 Note 1, and is not an organic nitrile, which falls under Chapter 29.
2837.11.00Industrial Sodium Cyanide Pellets
Pelletized sodium cyanide for automated dosing in mining leach circuits, with a polymer coating for dust control. It remains a chemically defined sodium cyanide compound, as the polymer coating is an addition for safety and does not alter its classification under Chapter 28 Note 1(e).
2837.11.00Pharmaceutical Grade Sodium Cyanide Crystals
Ultra-pure sodium cyanide crystals (99.9%) for laboratory and pharmaceutical synthesis of nitriles. This is a separate chemically defined compound of sodium, meeting Chapter 28 Note 1 criteria, and is not an organic derivative, which would fall under Chapter 29.
2837.11.00Sodium Cyanide Briquettes
Sodium cyanide (NaCN) compressed into briquette form for safe handling and transport in industrial applications. The briquette form does not change the chemical identity; it remains a separate chemically defined compound of sodium, meeting Chapter 28 Note 1 criteria.
2837.11.00Sodium Cyanide Flakes
Flake-form sodium cyanide, a white crystalline solid used in hydrometallurgical extraction of gold and silver. It is a separate chemically defined compound of sodium, meeting Chapter 28 Note 1 criteria, and is distinct from complex cyanides in heading 28.42.
2837.11.00Sodium Cyanide for Electroplating Baths
Specialty sodium cyanide grade optimized for gold and silver electroplating solutions, with low impurities to prevent plating defects. It is a separate chemically defined compound of sodium, meeting Chapter 28 Note 1 criteria, and is not a preparation or solution for retail sale.
2837.11.00Sodium Cyanide Mining Grade 98%
98% assay sodium cyanide in hot-pressed tablet form for heap leach gold recovery operations. It is a separate chemically defined compound of sodium, meeting Chapter 28 Note 1 criteria, and the tablet form does not alter its classification.
2837.11.00Sodium Cyanide Solution 30% Aqueous
Liquid solution of 30% sodium cyanide in water, used for safer handling in continuous flow mining processes. The solution is a product of Chapter 28 Note 1(b), as it is a sodium cyanide compound dissolved in water, and is not a preparation for retail sale.
2837.11.00Technical Grade Sodium Cyanide Powder
Technical grade powdered sodium cyanide (NaCN) for industrial use in metal extraction and chemical synthesis. It is a separate chemically defined compound of sodium, meeting Chapter 28 Note 1 criteria, and is distinct from complex cyanides in heading 28.42.
2837.19.00Barium Cyanide Granules
Barium cyanide granules (Ba(CN)2) are used in chemical synthesis and water treatment. They are a chemically defined simple cyanide of barium, an inorganic base. The product meets Chapter 28 Note 1 and is classified under this tariff item as 'other' cyanides.
2837.19.00Barium Cyanide Powder
Barium cyanide (Ba(CN)2) is a fine white powder used in specialty chemical manufacturing, including the production of other barium compounds and as a reagent in organic synthesis. It is a simple cyanide of an inorganic base, barium, and meets the chemical definition criteria of Chapter 28 Note 1. It is not a complex cyanide, so it falls under tariff item 2837.19.00 for other cyanides.
2837.19.00Cadmium Cyanide Crystals
Cadmium cyanide crystals (Cd(CN)2) are used in cadmium electroplating for corrosion-resistant coatings. They are a chemically defined simple cyanide of cadmium, an inorganic base. The crystalline form does not affect classification under this tariff item.
2837.19.00Cadmium Cyanide Fine Powder
Cadmium cyanide (Cd(CN)2) is a fine powder used in cadmium electroplating to produce corrosion-resistant coatings on metals. It is a simple cyanide of an inorganic base, cadmium, and is chemically defined as per Chapter 28 Note 1. It is not a complex cyanide, so it is classified under tariff item 2837.19.00 for other cyanides.
2837.19.00Calcium Cyanide 70% Technical Solution Precursor
Calcium cyanide at 70% technical concentration is a chemically defined compound of calcium and cyanide, used as a precursor for on-site solution making in mining. It is a simple cyanide of an inorganic base, falling under this tariff item. The concentration does not affect classification as long as it is a separate compound.
2837.19.00Calcium Cyanide Ca(CN)2 Powder
Calcium cyanide powder (Ca(CN)2) is a white crystalline powder used in gold mining for ore extraction via cyanidation. It is a chemically defined simple cyanide of calcium, an inorganic base. The product meets Chapter 28 Note 1 and is classified under this tariff item as 'other' cyanides.
2837.19.00Calcium Cyanide Granules
Calcium cyanide (Ca(CN)2) is supplied as granules for use in water treatment and as a fumigant in agriculture. It is a simple cyanide of an inorganic base, calcium, and is chemically defined under Chapter 28 Note 1. It is not a complex cyanide, so it falls under tariff item 2837.19.00 for other cyanides.
2837.19.00Cobalt Cyanide Granular
Cobalt cyanide (Co(CN)2) is a granular inorganic compound used as a catalyst precursor in various chemical reactions, including hydroformylation. It is a simple cyanide of an inorganic base, cobalt, and meets the chemical definition criteria of Chapter 28 Note 1. It is not a complex cyanide, so it is classified under tariff item 2837.19.00.
2837.19.00Copper Cyanide Technical Grade
Copper(I) cyanide (CuCN) technical grade powder is an intermediate in organic synthesis and copper plating baths. It is a chemically defined simple cyanide of copper, an inorganic base. The technical grade does not exclude it from Chapter 28, as it remains a separate compound.
2837.19.00Cuprous Cyanide Powder
Cuprous cyanide (CuCN) is a white to cream powder used primarily in copper electroplating baths and as a catalyst in organic synthesis. It is a simple cyanide of an inorganic base, copper(I), and is chemically defined per Chapter 28 Note 1. It is not a complex cyanide, so it falls under tariff item 2837.19.00 for other cyanides.
2837.19.00Gold(I) Cyanide Complex
Gold(I) cyanide (AuCN) is a chemically defined inorganic compound of gold used primarily in jewelry electroplating baths. Although it is a simple cyanide of a precious metal, it is classified under this tariff item as 'other' cyanides of inorganic bases. The compound meets the requirements of Chapter 28 Note 1 as a separate chemically defined compound.
2837.19.00Gold Potassium Cyanide
Potassium gold cyanide (KAu(CN)2) is a complex cyanide of gold and potassium, used in gold electroplating. It is a chemically defined compound of a precious metal and an inorganic base. Although it is a complex cyanide, it falls under this tariff item as 'other' cyanides, subject to Section Note 1(B) of Chapter 28.
2837.19.00High-Purity Calcium Cyanide for Laboratory Use
High-purity calcium cyanide (99%+) for laboratory use is a chemically defined compound of calcium and cyanide. It is a simple cyanide of an inorganic base, used in analytical chemistry. The high purity does not change its classification under this tariff item.
2837.19.00Industrial Grade Calcium Cyanide Granules
Granular calcium cyanide is an industrial chemical used in froth flotation for mineral extraction, particularly silver and gold recovery. It is a chemically defined simple cyanide of calcium. The granular form is a physical variation that does not affect classification under this tariff item.
2837.19.00Industrial Potassium Cyanide Briquettes
Industrial potassium cyanide briquettes are compressed forms of KCN designed for safe handling in mining operations, particularly for gold extraction. They are a simple cyanide of an inorganic base, potassium, and are chemically defined under Chapter 28 Note 1. The briquette form does not affect classification, so they fall under tariff item 2837.19.00.
2837.19.00Laboratory Reagent Potassium Cyanide
Potassium cyanide (KCN) in ACS reagent grade is a separate chemically defined inorganic compound of potassium. It is a simple cyanide of an inorganic base, falling squarely under the 'other' cyanides of this tariff item. The high purity for laboratory use does not affect its classification under Chapter 28.
2837.19.00Lithium Cyanide Pellets
Lithium cyanide (LiCN) is supplied as pellets for research applications, particularly in battery material development and organic synthesis. It is a simple cyanide of an inorganic base, lithium, and is chemically defined under Chapter 28 Note 1. It is not a complex cyanide, so it is classified under tariff item 2837.19.00.
2837.19.00Mercuric Cyanide Reagent
Mercuric cyanide (Hg(CN)2) is a reagent-grade chemical used in analytical chemistry for various titration and detection methods. It is a simple cyanide of an inorganic base, mercury, and is chemically defined per Chapter 28 Note 1. It is not a complex cyanide, so it falls under tariff item 2837.19.00.
2837.19.00Nickel Cyanide for Electroplating
Nickel cyanide [Ni(CN)2] is a specialized inorganic chemical used as a source of nickel in electroplating solutions, particularly for automotive parts finishing. As a separate chemically defined compound of an inorganic base, it falls under tariff item 2837.19.00 for other cyanides.
2837.19.00Nickel Cyanide Tetrahydrate
Nickel cyanide tetrahydrate (Ni(CN)2·4H2O) is used in nickel electroplating solutions to provide a source of nickel ions. It is a simple cyanide of an inorganic base, nickel, and is chemically defined under Chapter 28 Note 1. The hydrated form is still classified as a simple cyanide, so it falls under tariff item 2837.19.00.
2837.19.00Pharmaceutical Potassium Cyanide Crystals
High-purity potassium cyanide crystals of USP grade are a chemically defined simple cyanide of potassium. Used in specialized chemical synthesis, the product meets Chapter 28 Note 1 criteria as a separate compound. It is classified under this tariff item as 'other' cyanides of inorganic bases.
2837.19.00Potassium Cyanide Crystals
Potassium cyanide (KCN) in crystalline powder form is used in organic synthesis, metal hardening, and electroplating. It is a simple cyanide of an inorganic base, potassium, and is chemically defined per Chapter 28 Note 1. It is not a complex cyanide, so it falls under tariff item 2837.19.00.
2837.19.00Potassium Cyanide White Powder
Potassium cyanide in white crystalline powder form is a pure, chemically defined simple cyanide of potassium. It is an inorganic compound of an inorganic base, meeting the Chapter 28 Note 1 definition. The physical form (powder) does not alter its classification under this tariff item.
2837.19.00Potassium Ferricyanide Powder
Potassium ferricyanide [K3Fe(CN)6] is a red crystalline complex cyanide salt used in blueprint photography, analytical chemistry, and as a mild oxidizing agent. As a chemically defined complex cyanide of an inorganic base, it is classified under tariff item 2837.19.00 for other cyanides.
2837.19.00Potassium Nickel Cyanide Complex
Tripotassium nickelocyanide [K3Ni(CN)5] is a complex cyanide salt used as a source of nickel in bright nickel electroplating baths. As a chemically defined complex cyanide of an inorganic base, it falls under tariff item 2837.19.00 for other cyanides.
2837.19.00Silver Cyanide Powder
Silver cyanide (AgCN) is a white powder used in silver mirror plating and photographic emulsions. As a separate chemically defined inorganic compound of a precious metal base, it is classified under tariff item 2837.19.00 for other cyanides.
2837.19.00Silver Cyanide Precipitate
Silver cyanide (AgCN) is a precipitated powder used in mirror manufacturing and as a precursor for silver plating solutions. It is a simple cyanide of an inorganic base, silver, and is chemically defined under Chapter 28 Note 1. Despite containing a precious metal, it is classified as a simple cyanide under tariff item 2837.19.00.
2837.19.00Sodium Cyanide Briquettes
Sodium cyanide (NaCN) in compressed briquette form is used primarily in gold mining for leaching processes and in electroplating. It is a simple cyanide of an inorganic base, sodium, and is chemically defined per Chapter 28 Note 1. It is not a complex cyanide, so it falls under tariff item 2837.19.00.
2837.19.00Sodium Cyanide Crystals
Sodium cyanide (NaCN) in crystalline form is a highly toxic inorganic salt used primarily in gold mining for extracting gold from ore via cyanidation. As a separate chemically defined simple cyanide of an inorganic base, it falls under tariff item 2837.19.00 for other cyanides.
2837.19.00Sodium Cyanide Prills
Sodium cyanide prills are spherical, high-purity forms of NaCN optimized for rapid dissolution in mining operations. They are a simple cyanide of an inorganic base, sodium, and are chemically defined under Chapter 28 Note 1. The physical form (prills) does not affect classification, so they fall under tariff item 2837.19.00.
2837.19.00Stabilized Calcium Cyanide Briquettes for Mining
Stabilized calcium cyanide briquettes are compressed forms designed for easy dissolution in mining leach tanks for gold cyanidation. They are a chemically defined simple cyanide of calcium. The addition of a stabilizer for transport is permitted under Chapter 28 Note 1(d), so classification remains under this tariff item.
2837.19.00Strontium Cyanide Flakes
Strontium cyanide (Sr(CN)2) is supplied in flake form for use in pyrotechnics and research applications. It is a simple cyanide of an inorganic base, strontium, and is chemically defined under Chapter 28 Note 1. It is not a complex cyanide, so it is classified under tariff item 2837.19.00.
2837.19.00Technical Grade Calcium Cyanide Flakes
Technical-grade calcium cyanide flakes are produced for electroplating baths and metal hardening processes. They are a chemically defined simple cyanide of calcium. The flake form is a physical state that does not alter classification under this tariff item.
2837.19.00Technical Grade Potassium Cyanide Flakes
Technical-grade potassium cyanide in flake form is a chemically defined simple cyanide of potassium, used in extraction metallurgy. The technical purity does not exclude it from Chapter 28, as it remains a separate compound. It is classified under this tariff item as 'other' cyanides of inorganic bases.
2837.19.00Zinc Cyanide Crystals
Zinc cyanide (Zn(CN)2) crystals are used in zinc electroplating to provide a source of zinc ions in the plating bath. It is a simple cyanide of an inorganic base, zinc, and is chemically defined per Chapter 28 Note 1. It is not a complex cyanide, so it falls under tariff item 2837.19.00.
2837.19.00Zinc Cyanide Flakes
Zinc cyanide [Zn(CN)2] in flake form is used in zinc electroplating processes and as a catalyst precursor. As a separate chemically defined simple inorganic cyanide of a zinc base, it is classified under tariff item 2837.19.00 for other cyanides.
2837.20.00ACS Reagent Potassium Ferricyanide
ACS reagent grade potassium ferricyanide, a pure and chemically defined complex cyanide of potassium and iron, used for high-precision titrations and spectroscopy. It is a separate chemically defined compound of inorganic bases, classifiable under heading 28.37 as a complex cyanide.
2837.20.00Cesium Tetraphenylborate
Cesium tetraphenylborate is a chemical compound used primarily in analytical chemistry for the detection and precipitation of cesium ions. Despite containing organic phenyl groups, it is classified as a complex cyanide of an inorganic base, falling under tariff item 2837.20.00. This compound is typically imported in powder form for laboratory or industrial use.
2837.20.00Copper Potassium Cyanide
Copper potassium cyanide, a complex cyanide used in copper electroplating baths. It is a chemically defined compound of inorganic bases (copper and potassium), classifiable under heading 28.37 as a complex cyanide.
2837.20.00Ferric Ammonium Ferrocyanide
Ferric ammonium ferrocyanide, also known as Prussian blue, a blue pigment used in paints and inks. It is a complex cyanide of iron and ammonium, classifiable under tariff item 2837.20.00 as a complex cyanide of inorganic bases.
2837.20.00Potassium Ferricyanide
Potassium ferricyanide, a red-orange complex cyanide salt used in blueprint photography and as an analytical reagent. It is a chemically defined complex cyanide of potassium and iron, classifiable under heading 28.37.
2837.20.00Potassium Ferricyanide Lab Crystals
Large crystal form of potassium ferricyanide for educational lab demonstrations of redox reactions, including Prussian blue formation. As a pure, chemically defined complex cyanide of potassium and iron, it falls under tariff item 2837.20.00.
2837.20.00Potassium Ferricyanide Powder
Pure potassium ferricyanide (K3[Fe(CN)6]) in fine powder form, a chemically defined complex cyanide used as an analytical reagent. It is a separate compound of inorganic bases, classifiable under heading 28.37 as a complex cyanide.
2837.20.00Potassium Ferrocyanide
Potassium ferrocyanide, also known as yellow prussiate of potash, used in wine production and as an anti-caking agent. It is a complex cyanide of potassium and iron, classifiable under tariff item 2837.20.00.
2837.20.00Silver Cyanide Complex
Silver cyanide complex salts used in electroplating and mirror manufacturing. These are complex cyanides of silver, an inorganic base, classifiable under heading 28.37 as complex cyanides.
2837.20.00Sodium Nitroprusside
Sodium nitroprusside, a complex cyanide salt used as a vasodilator in medical treatments. It is a chemically defined complex cyanide of sodium and iron, classifiable under tariff item 2837.20.00.
2837.20.00Technical Grade Potassium Ferricyanide
Technical grade potassium ferricyanide crystals for industrial blueprinting and photography processes. As a chemically defined complex cyanide of potassium and iron, it is classifiable under tariff item 2837.20.00.
2837.20.00Zinc Cyanide Complex
Zinc cyanide complexes employed in metal finishing and as catalysts. These are complex cyanides of zinc, an inorganic base, classifiable under heading 28.37 as complex cyanides.