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Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts: > Other: > Other
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Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Products classified under HTS 2826.90.90
Sodium Fluorosilicate
Sodium fluorosilicate (Na2SiF6) is a complex fluorine salt used primarily as a fluoridating agent in water treatment and in the production of enamels. It falls under HTS 2826.90.90 as a fluorosilicate, which is explicitly listed in the heading for complex fluorine salts other than simple fluorides. This white crystalline powder is chemically defined and meets Chapter 28 criteria for inorganic compounds.
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. Classified under HTS 2826.90.90 as a fluoroaluminate, one of the specified complex fluorine salts in the heading. It appears as a white to off-white powder essential in metallurgical processes.
Ammonium Bifluoride
Ammonium bifluoride (NH4HF2) is a complex fluorine salt used as a cleaning agent, etchant for glass and metal etching. It qualifies for HTS 2826.90.90 as 'other complex fluorine salts' since it is not a simple fluoride. This hazardous crystalline material requires careful handling.
Barium Fluorosilicate
Barium fluorosilicate (BaSiF6) serves as an insecticide and rodenticide in agricultural applications and is a complex fluorine salt under HTS 2826.90.90. Its chemical definition as a fluorosilicate places it within this 'other' subheading excluding simpler fluorides. Typically supplied as a fine powder.
Cryolite Synthetic
Synthetic cryolite (Na3AlF6) is a key flux in aluminum production, classified as a fluoroaluminate complex fluorine salt in HTS 2826.90.90. Unlike natural cryolite (2603), this chemically pure synthetic version meets Chapter 28 definitions for inorganic compounds. It is a white powdery material.
Zinc Fluorosilicate
Zinc fluorosilicate (ZnSiF6) is used in electroplating baths and as a hardening agent in concrete, fitting HTS 2826.90.90 as a fluorosilicate complex salt. This hygroscopic crystalline compound is chemically defined per Chapter Note 1. Commonly available in hydrated forms.
Magnesium Fluoroaluminate
Magnesium fluoroaluminate is a complex salt employed in ceramic glazes and refractories, classified under HTS 2826.90.90 for fluoroaluminates. It satisfies the chemically defined criteria of Chapter 28, distinguishing it from mixtures. Typically a fine powder for high-temperature applications.
Fluoboric Acid 40% Solution
Fluoboric acid (HBF4), a complex fluorine salt in 40% aqueous solution, is used in metal plating and electronics etching under HTS 2826.90.90. As tetrafluoroboric acid, it qualifies as 'other complex fluorine salts'. This corrosive liquid requires specialized handling.
Potassium Fluorozirconate
Potassium fluorozirconate (K2ZrF6) functions as an opacifier in ceramics and is classified in HTS 2826.90.90 as other complex fluorine salts. Its zirconate-fluorine complex structure fits the heading perfectly. Used in powdered form for glaze formulations.
Sodium Fluorozirconate
Sodium fluorozirconate (Na2ZrF6) is utilized in the production of zirconium chemicals and as a precipitant, falling under HTS 2826.90.90 for complex fluorine salts. Chemically defined and pure, it adheres to Chapter 28 inclusions. White crystalline appearance.
Aluminum Fluorotitanate
Aluminum fluorotitanate serves in titanium anodizing processes and is a complex fluorine salt under HTS 2826.90.90. Its defined inorganic composition excludes it from mixtures or organics. Supplied as solution or powder.
Fluostannic Acid
Fluostannic acid (H2SnF6) is used in tin plating and textile finishing, classified as other complex fluorine salts in HTS 2826.90.90. Meets all chemical definition notes for Chapter 28. Corrosive liquid form.