Chapter 2826 — Customs Tariff Headings

Aluminum Fluoride (AlF3)

Aluminum fluoride (AlF3) is a white crystalline powder used primarily as a flux in aluminum smelting to lower the melting point of alumina. It is a separate chemically defined compound of aluminum and fluorine, meeting the criteria of Chapter 28 Note 1(a). It is classifiable under tariff item 2826.12.00 as a fluoride of aluminum.

Aluminum Fluoride Hydrate (AlF3·3H2O)

Aluminum fluoride hydrate (AlF3·3H2O) is a hydrated form of aluminum fluoride used as an intermediate in fluorochemical production and as a flux. As a hydrate of a chemically defined compound, it remains within Chapter 28 Note 1(b) (products dissolved in water) and is classifiable under 2826.12.00 as a fluoride of aluminum.

Aluminum Fluosilicate (Al2(SiF6)3)

Aluminum fluosilicate (Al2(SiF6)3) is a complex fluorine salt of aluminum, used as a laundry sour and in water fluoridation. Although it contains silicon, it is a fluosilicate, which falls under the subheading 'fluorosilicates, fluoroaluminates and other complex fluorine salts' (2826.90) rather than 2826.12.00, which covers only simple fluorides of aluminum. Therefore, it does not belong under this tariff item.

Potassium Aluminum Fluoride (KAlF4)

Potassium aluminum fluoride (KAlF4) is a double fluoride salt of potassium and aluminum, used as a cover flux in aluminum remelting. It is a complex fluoride, not a simple fluoride of aluminum, and is classifiable under 2826.90 (other complex fluorine salts) rather than 2826.12.00. Thus, it does not fall under this tariff item.

Sodium Aluminum Fluoride (Na3AlF6, Cryolite)

Sodium aluminum fluoride (Na3AlF6, cryolite) is a complex fluoride of aluminum and sodium, essential in the Hall-Héroult process. As a fluoroaluminate, it is a complex fluorine salt, not a simple fluoride, and is classified under 2826.90 (fluoroaluminates) rather than 2826.12.00. Therefore, it is excluded from this tariff item.

Synthetic Cryolite Powder (Na3[AlF6])

Synthetic cryolite powder (Na3[AlF6]) is a fine powder form of sodium hexafluoroaluminate, used in aluminum production and as an opacifier. It is a fluoroaluminate complex salt, which falls under 2826.90 (other complex fluorine salts), not under 2826.12.00 for simple aluminum fluorides. Hence, it does not belong under this tariff item.

Ammonium Bifluoride

Ammonium bifluoride ((NH4)HF2) is an inorganic acid salt used in industrial cleaning, oil well acidizing, and metal pickling. It is a chemically defined compound of ammonium and fluorine, falling under the 'other' fluorides of this tariff item.

Ammonium Difluoride

Ammonium difluoride (NH4HF2 variant) is used in beaker cleaning and synthetic fluoride production. It is a chemically defined simple fluoride salt of ammonium, qualifying as an 'other' fluoride under this tariff item.

Ammonium Fluoborate

Ammonium fluoborate (NH4BF4) is utilized in electroplating baths, explosives, and synthetic resins. It is a complex fluorine salt of ammonium, classified under 'other' fluorides in this tariff item.

Ammonium Fluoride

Ammonium fluoride (NH4F) is a white crystalline salt used in chemical synthesis, glass etching, and as a fluorine source in pharmaceuticals. It is a chemically defined fluoride of ammonium, falling under 'other' fluorides in this tariff item.

Ammonium Fluorosilicate

Ammonium fluorosilicate ((NH4)2SiF6) serves as a rodenticide, water fluoridation agent, and in ceramic production. It is a complex fluorine salt of ammonium, classified under 'other' fluorides in this tariff item.

Ammonium Fluorotitanate

Ammonium fluorotitanate ((NH4)2TiF6) acts as a catalyst in organic synthesis and titanium processing. It is a complex fluorine salt of ammonium, falling under 'other' fluorides in this tariff item.

Ammonium Fluorozirconate

Ammonium fluorozirconate ((NH4)2ZrF6) finds use in ceramics, nuclear fuel processing, and as a precipitant. It is an inorganic complex salt of ammonium and fluorine, classified under 'other' fluorides in this tariff item.

Anhydrous Sodium Fluoride

Anhydrous sodium fluoride is a dry, pure form of NaF employed in metallurgical fluxes and aluminum smelting processes. It is a chemically defined fluoride of sodium, falling under 'other' fluorides in this tariff item.

Neutral Ammonium Fluoride

Neutral ammonium fluoride (pure NH4F anhydrous) is used for specialty etching and doping. It is a chemically defined fluoride of ammonium, falling under 'other' fluorides in this tariff item, provided it is not doped for electronics.

Pharmaceutical Grade Sodium Fluoride

Pharmaceutical grade sodium fluoride is a USP-grade product for compounding in fluoride supplements and veterinary medicines. It is a chemically defined fluoride of sodium, falling under 'other' fluorides in this tariff item, prior to formulation into medicaments.

Sodium Bifluoride

Sodium bifluoride (NaHF2), also known as sodium acid fluoride, is used in cleaning agents and etching solutions. It is a chemically defined fluoride of sodium, falling under 'other' fluorides in this tariff item.

Sodium Fluoride Crystals

High-purity sodium fluoride crystals are utilized in the production of specialty glasses and enamels for their fluxing properties. They are chemically defined fluorides of sodium, falling under 'other' fluorides in this tariff item.

Sodium Fluoride for Water Fluoridation

Granular sodium fluoride specifically graded for public water supply fluoridation is a chemically defined fluoride of sodium. It falls under 'other' fluorides in this tariff item, meeting chemical purity standards.

Sodium Fluoride Lab Reagent

ACS-grade sodium fluoride for analytical chemistry labs is used in fluoride ion selective electrode calibration. It is a chemically defined fluoride of sodium, falling under 'other' fluorides in this tariff item.

Sodium Fluoride Powder

Sodium fluoride (NaF) is a white crystalline powder used primarily as a fluoridating agent in water treatment and toothpaste formulations. It is a chemically defined fluoride of sodium, falling under 'other' fluorides in this tariff item.

Abrasive Grade Synthetic Cryolite

Abrasive-grade synthetic cryolite in powder form, composed of sodium hexafluoroaluminate (Na3AlF6), used as a filler to enhance cutting efficiency in grinding wheels and sandpaper. Its hardness and chemical stability make it suitable for abrasive applications. This product is classified under tariff item 2826.30.00 as a chemically defined compound of sodium hexafluoroaluminate, meeting the criteria of Chapter 28 Note 1.

Electrolysis Bath Synthetic Cryolite

Specialty synthetic cryolite designed for maintaining the composition of aluminum electrolysis baths, with controlled density and purity to replenish fluoride losses in smelters. It is a chemically defined sodium hexafluoroaluminate compound, falling under tariff item 2826.30.00. This product is essential for efficient aluminum production and meets Chapter 28's criteria for separate chemically defined compounds.

Granular Synthetic Cryolite

Granular synthetic cryolite in a form that facilitates handling and use as a bath additive in aluminum plants, composed of sodium hexafluoroaluminate. The granular form does not alter the chemical identity, so it remains classified under tariff item 2826.30.00. This product improves cell efficiency in electrolytic aluminum production and is a chemically defined compound per Chapter 28.

High Purity Na3AlF6 Cryolite

Ultra-high purity synthetic cryolite with a purity exceeding 99.5%, used for specialty aluminum alloys and high-performance abrasives. This product is a chemically defined sodium hexafluoroaluminate compound, classified under tariff item 2826.30.00. Its high purity ensures minimal impurities, aligning with Chapter 28's requirements for separate chemically defined compounds.

Industrial Grade Synthetic Cryolite

Industrial-grade synthetic cryolite in granular form, used in electrolytic aluminum production and as a flux in ceramics. It is a chemically defined sodium hexafluoroaluminate compound, classified under tariff item 2826.30.00. This product meets the Chapter 28 criteria for separate chemically defined compounds, regardless of its industrial application.

Micronized Synthetic Cryolite

Micronized synthetic cryolite with particle size below 10 microns, used as a fine flux in glass and enamel frits to enhance melt homogeneity. This product is a chemically defined sodium hexafluoroaluminate compound, classified under tariff item 2826.30.00. The particle size does not affect its classification, as it remains a separate chemically defined compound per Chapter 28.

Sodium Hexafluoroaluminate Flux Grade

Flux-grade synthetic cryolite optimized for aluminum reduction cells, with low iron impurities to ensure efficient electrolysis. This product is a chemically defined sodium hexafluoroaluminate compound, classified under tariff item 2826.30.00. It is specifically designed for use in aluminum smelting, meeting Chapter 28's criteria for separate chemically defined compounds.

Synthetic Cryolite 98% Purity

Standard 98% purity synthetic cryolite used for cost-effective fluxing in secondary aluminum production, composed of sodium hexafluoroaluminate. This product is a chemically defined compound, classified under tariff item 2826.30.00. It meets Chapter 28's requirements for separate chemically defined compounds, even with minor impurities.

Synthetic Cryolite for Ceramics

Fine-ground synthetic cryolite used as a flux in porcelain and enamel production to lower firing temperatures, composed of sodium hexafluoroaluminate. This product is a chemically defined compound, classified under tariff item 2826.30.00. It meets Chapter 28's criteria for separate chemically defined compounds, regardless of its application in ceramics.

Synthetic Cryolite Powder

Synthetic cryolite in powder form, chemically sodium hexafluoroaluminate (Na3AlF6), used primarily as a flux in aluminum smelting to lower the melting point of alumina. This product is a separate chemically defined compound, classified under tariff item 2826.30.00. It meets Chapter 28's criteria for classification, as it is a well-defined inorganic compound.

Aluminum Fluorotitanate

Aluminum fluorotitanate serves in titanium anodizing processes and is a complex fluorine salt under tariff item 2826.90.00. Its defined inorganic composition excludes it from mixtures or organics. The product is supplied as a solution or powder, meeting Chapter 28 criteria for chemical compounds.

Ammonium Bifluoride

Ammonium bifluoride (NH4HF2) is a complex fluorine salt used as a cleaning agent, etchant for glass and metal etching. It qualifies for tariff item 2826.90.00 as 'other complex fluorine salts' since it is not a simple fluoride. The product meets Chapter 28 criteria as a separate chemical compound.

Barium Fluorosilicate

Barium fluorosilicate (BaSiF6) serves as an insecticide and rodenticide in agricultural applications and is a complex fluorine salt under tariff item 2826.90.00. Its chemical definition as a fluorosilicate places it within this heading. The product meets Chapter 28 criteria as a separate chemical compound.

Cryolite Synthetic

Synthetic cryolite (Na3AlF6) is a key flux in aluminum production, classified as a fluoroaluminate complex fluorine salt in tariff item 2826.90.00. Unlike natural cryolite, this chemically pure synthetic version meets Chapter 28 criteria. The product is a separate chemical compound.

Fluoboric Acid 40% Solution

Fluoboric acid (HBF4), a complex fluorine salt in 40% aqueous solution, is used in metal plating and electronics etching under tariff item 2826.90.00. As tetrafluoroboric acid, it qualifies as 'other complex fluorine salts'. The product meets Chapter 28 criteria as a chemical compound in aqueous solution.

Fluostannic Acid

Fluostannic acid (H2SnF6) is used in tin plating and textile finishing, classified as other complex fluorine salts in tariff item 2826.90.00. It meets all chemical definition notes for Chapter 28. The product is supplied as a corrosive liquid.

K2SiF6 Flux for Ceramics

Potassium fluorosilicate flux powder enhances opacity in ceramic glazes and enamels. It is a chemically defined potassium fluorosilicate (K2SiF6), falling under tariff item 2826.90.00 as a fluorosilicate. This product is not excluded by Chapter 28 notes as it is not a glass frit or other glass in powder form.

Magnesium Fluoroaluminate

Magnesium fluoroaluminate is a complex salt employed in ceramic glazes and refractories, classified under tariff item 2826.90.00 for fluoroaluminates. It satisfies the chemically defined criteria of Chapter 28. The product is a separate chemical compound.

Potassium Fluoroaluminate

Potassium fluoroaluminate (KAlF4), also known as potassium cryolite, is a complex fluorine salt used as a flux in aluminum smelting and welding applications. It is classified under tariff item 2826.90.00 as a fluoroaluminate. The product meets Chapter 28 criteria as a separate chemical compound.

Potassium Silicofluoride Crystals

Potassium silicofluoride appears as colorless crystals or powder, employed in ceramic production as an anti-foaming agent and flux. It is a chemically defined potassium fluorosilicate (K2SiF6), classified under tariff item 2826.90.00. The product meets Chapter 28 criteria as a separate chemically defined compound.

Reagent Grade Na2SiF6

ACS reagent-grade sodium silicofluoride is a high-purity chemical for analytical chemistry and synthesis. It is a chemically defined sodium fluorosilicate (Na2SiF6) meeting Chapter 28 criteria for separate chemical compounds. This product falls under tariff item 2826.90.00 as a fluorosilicate.

Sodium Fluorosilicate 99% Pure Grade

High-purity sodium fluorosilicate (99% Na2SiF6) is supplied for laboratory and pharmaceutical fluoridation applications. It qualifies as a chemically defined sodium fluorosilicate under tariff item 2826.90.00. The product is not excluded by Chapter 28 notes as it is a separate chemical compound.

Sodium Silicofluoride for Water Fluoridation

Granular Na2SiF6 is specifically formulated for municipal drinking water fluoridation systems. It falls under tariff item 2826.90.00 as sodium fluorosilicate, chemically defined per Chapter 28 criteria. The product is not excluded by Chapter 31 notes as it is not a fertilizer.

Sodium Silicofluoride Powder

Sodium silicofluoride is a white crystalline powder used primarily as a fluoridating agent in water treatment to prevent tooth decay. It is a chemically defined sodium fluorosilicate (Na2SiF6) falling under tariff item 2826.90.00. The product meets Chapter 28 criteria as a separate chemical compound.