Chapter 2835 — Customs Tariff Headings

Ammonium Hypophosphite

Ammonium hypophosphite (NH4H2PO2) is a white crystalline salt used as a reducing agent in chemical synthesis and as a polymer stabilizer. It is a phosphinate (hypophosphite) of an inorganic base, ammonium, and meets the definition of a separate chemically defined compound under Chapter 28. This tariff item covers phosphinates and phosphonates, including ammonium salts.

Calcium Hypophosphite

Calcium hypophosphite (Ca(H2PO2)2) is an inorganic salt used in pharmaceuticals and as a calcium supplement in food products. It is a phosphinate (hypophosphite) of calcium, an inorganic base, and qualifies as a separate chemically defined compound under Chapter 28. This tariff item specifically covers phosphinates and phosphonates.

Disodium Phosphite Pentahydrate

Disodium phosphite pentahydrate (Na2HPO3·5H2O) is a hydrated form of sodium phosphite used as a reagent in analytical chemistry. Despite the water of hydration, it remains a separate chemically defined compound under Chapter 28, as hydrates are not excluded. It is a phosphonate (phosphite) of an inorganic base, sodium, and falls under this tariff item.

Magnesium Phosphite

Magnesium phosphite (MgHPO3) is used in fire retardants and water treatment applications. It is a phosphonate (phosphite) of magnesium, an inorganic base, and qualifies as a separate chemically defined compound under Chapter 28. This tariff item covers phosphonates, including magnesium salts.

Manganese Hypophosphite

Manganese hypophosphite (Mn(H2PO2)2) is a specialty chemical used in nutritional supplements and as a catalyst. It is a phosphinate (hypophosphite) of manganese, an inorganic base, and meets the definition of a separate chemically defined compound under Chapter 28. This tariff item covers phosphinates, including metal salts.

Potassium Phosphite

Potassium phosphite (KH2PO3) is used as a fungicide and plant nutrient in agriculture. It is a phosphonate (phosphite) of potassium, an inorganic base, and qualifies as a separate chemically defined compound under Chapter 28. This tariff item covers phosphonates, including potassium salts.

Sodium Hypophosphite

Sodium hypophosphite (NaH2PO2) is a white crystalline powder used as a reducing agent in chemical synthesis and electroless nickel plating. It is a phosphinate (hypophosphite) of sodium, an inorganic base, and meets the definition of a separate chemically defined compound under Chapter 28. This tariff item specifically covers phosphinates.

Sodium Hypophosphite Monohydrate

Sodium hypophosphite monohydrate (NaH2PO2·H2O) is the common commercial form used in electroless plating baths. It is a phosphinate (hypophosphite) of sodium, and the water of hydration does not affect its classification as a separate chemically defined compound under Chapter 28. This tariff item covers phosphinates, including hydrates.

Sodium Phosphite

Sodium phosphite (Na2HPO3) is a reducing agent and antioxidant used in water treatment and polymer production. It is a phosphonate (phosphite) of sodium, an inorganic base, and qualifies as a separate chemically defined compound under Chapter 28. This tariff item covers phosphonates, including sodium salts.

Zinc Phosphite

Zinc phosphite (ZnHPO3) functions as a corrosion inhibitor and flame retardant in coatings. It is a phosphonate (phosphite) of zinc, an inorganic base, and meets the definition of a separate chemically defined compound under Chapter 28. This tariff item covers phosphonates, including zinc salts.

Disodium Phosphate Anhydrous USP

Disodium phosphate anhydrous (Na2HPO4) is a chemically defined inorganic salt of disodium, used as a buffering agent in pharmaceuticals and food processing. It falls under tariff item 2835.22.00 as a phosphate of disodium, meeting the chapter's criteria for separate chemically defined compounds.

Disodium Phosphate Dodecahydrate

Disodium phosphate dodecahydrate (Na2HPO4·12H2O) is a hydrated form of disodium phosphate, used in lab reagents and pharmaceutical laxatives. As a chemically defined inorganic salt, it is classified under tariff item 2835.22.00, with the water of hydration not affecting its classification.

Disodium Phosphate Food Grade

Food-grade disodium phosphate meets FCC standards for use in cheese processing and evaporated milk stabilization. It is a chemically defined disodium salt, classified under tariff item 2835.22.00, provided it contains no organic additives that would exclude it from Chapter 28.

Monosodium Phosphate Anhydrous

Monosodium phosphate anhydrous (NaH2PO4) is a chemically defined inorganic salt used in buffer solutions and flame retardants. It is classified under tariff item 2835.22.00 as a phosphate of monosodium, meeting Chapter 28's criteria for pure compounds.

Monosodium Phosphate Dihydrate

Monosodium phosphate dihydrate (NaH2PO4·2H2O) is an acidulant and sequestrant used in beverages and metal treatment. As a chemically defined inorganic compound of monosodium, it falls under tariff item 2835.22.00, with the hydrate form not altering classification.

Sodium Acid Pyrophosphate

Sodium acid pyrophosphate (Na2H2P2O7) is a polyphosphate of disodium, used as a leavening agent in baking powders and meat products. It is classified under tariff item 2835.22.00 as a phosphate of disodium, since the heading includes polyphosphates whether or not chemically defined.

Sodium Phosphate Dibasic

Sodium phosphate dibasic is a synonym for disodium phosphate, used in molecular biology buffers like PBS. It is a chemically defined disodium salt, classified under tariff item 2835.22.00, regardless of the grade or purity level.

Tetrasodium Pyrophosphate

Tetrasodium pyrophosphate (Na4P2O7) is a polyphosphate used as a dispersant and detergent builder. Although it has four sodium atoms, it is classified under tariff item 2835.22.00 as a polyphosphate of disodium, as the subheading covers polyphosphates of mono- or disodium.

Dipotassium Phosphate (DKP)

Dipotassium phosphate (K2HPO4) is a chemically defined inorganic salt of potassium and phosphoric acid. It is used as a buffering agent and nutrient in food, beverage, and pharmaceutical applications, and qualifies as a phosphate of potassium under this tariff item.

Disodium Potassium Phosphate

Disodium potassium phosphate is a mixed salt containing both sodium and potassium cations. Although it contains potassium, it is not a single chemically defined potassium phosphate; it may be classified as a complex salt or under another phosphate heading depending on its exact composition.

Food-Grade Monopotassium Phosphate

Food-grade monopotassium phosphate (KH2PO4) is a chemically defined potassium phosphate salt meeting FCC purity specifications. Its use as an acidity regulator in food does not alter its classification as a phosphate of potassium under this tariff item.

Monopotassium Phosphate (MKP)

Monopotassium phosphate (KH2PO4) is a chemically defined inorganic salt used as a fertilizer and reagent. It is a phosphate of potassium and falls squarely under this tariff item, regardless of its agricultural application.

Potassium Dihydrogen Phosphate

Potassium dihydrogen phosphate is another name for monopotassium phosphate (KH2PO4). It is a chemically defined potassium phosphate salt used in fertilizers and as a laboratory reagent, classifiable under this tariff item.

Potassium Orthophosphate

Potassium orthophosphate (K3PO4) is a chemically defined tribasic potassium phosphate salt. It is used in fire retardants and industrial applications, and qualifies as a phosphate of potassium under this tariff item.

Potassium Phosphate Monobasic Anhydrous

Potassium phosphate monobasic anhydrous (KH2PO4) is a pure, chemically defined potassium phosphate salt used in pharmaceutical buffering. It falls under this tariff item as a phosphate of potassium.

Potassium Phosphate Tribasic

Potassium phosphate tribasic (K3PO4) is a chemically defined potassium phosphate salt used as a sequestrant in detergents and food processing. It is a phosphate of potassium and classifiable under this tariff item.

Technical Grade Dipotassium Phosphate

Technical grade dipotassium phosphate (K2HPO4) is a chemically defined potassium phosphate salt used in water treatment and as a laboratory reagent. It falls under this tariff item as a phosphate of potassium.

Tripotassium Phosphate (TKP)

Tripotassium phosphate (K3PO4) is a chemically defined potassium phosphate salt used as a food additive for pH control and emulsification. It is a phosphate of potassium and classifiable under this tariff item.

Anhydrous Dicalcium Phosphate Food Grade

Anhydrous dicalcium phosphate (CaHPO4) in food grade, used as a dough conditioner, nutrient supplement, and anti-caking agent in baked goods. It is a separate chemically defined compound of calcium and phosphorus, falling under tariff item 2835.25.00 for calcium hydrogenorthophosphate.

Dicalcium Phosphate Dihydrate USP Grade

Dicalcium phosphate dihydrate (CaHPO4·2H2O) in USP grade, used as a calcium and phosphorus supplement in tablets and capsules. It is a chemically defined compound with water of hydration, classifiable under calcium hydrogenorthophosphate.

Dicalcium Phosphate Fertilizer Grade Pellets

Pelletized dicalcium phosphate fertilizer grade, providing slow-release phosphorus for soil amendment. Although intended for agricultural use, it remains a chemically defined compound of calcium hydrogenorthophosphate, not yet mixed into a fertilizer preparation.

Dicalcium Phosphate for Toothpaste Abrasive

Precipitated dicalcium phosphate optimized as a mild abrasive in toothpaste, with controlled particle shape for polishing without enamel damage. It is a pure chemical compound used as an ingredient, classifiable under calcium hydrogenorthophosphate.

Dicalcium Phosphate Technical Grade Powder

Technical grade calcium hydrogenorthophosphate powder used in water treatment as a corrosion inhibitor and in ceramics as a flux. It is a chemically defined inorganic phosphate compound, classifiable under tariff item 2835.25.00.

EP Grade Dicalcium Phosphate for EU Pharma

European Pharmacopoeia compliant dicalcium phosphate dihydrate for pharmaceutical manufacturing, with stringent microbial limits. It is a chemically defined compound of calcium hydrogenorthophosphate, classifiable under tariff item 2835.25.00.

Feed Grade Dicalcium Phosphate 18% Phosphorus

Granular dicalcium phosphate with minimum 18% phosphorus and 21% calcium, designed for livestock mineral supplements. It is a chemically defined compound of calcium hydrogenorthophosphate, classifiable under tariff item 2835.25.00.

Nano-Dicalcium Phosphate for Advanced Supplements

Nanoparticle dicalcium phosphate (<100nm) for enhanced bioavailability in nutraceuticals and bone health formulas. Despite the particle size, it remains a chemically defined compound of calcium hydrogenorthophosphate, classifiable under tariff item 2835.25.00.

Pharmaceutical Dicalcium Phosphate Granules

Direct compressible granules of dicalcium phosphate dihydrate for high-speed tablet pressing in vitamin and mineral formulations. It is a chemically defined compound of calcium hydrogenorthophosphate, classifiable under tariff item 2835.25.00.

Calcium Metaphosphate Glassy Flakes

Glassy calcium metaphosphate flakes used in dental cements and sealants. These flakes provide controlled solubility, making them suitable for dental applications. They are classified as other phosphates of calcium under tariff item 2835.26.00.

Calcium Phosphate Tribasic Granules

Granular tricalcium phosphate used in nutritional supplements and as a flow agent. The granulation improves handling and dissolution properties. This product falls under other phosphates of calcium in tariff item 2835.26.00.

Calcium Pyrophosphate Precipitated Powder

Fine precipitated calcium pyrophosphate powder used as a polishing agent in toothpaste and as a lubricant additive. It is biocompatible for dental applications. This product is classified under other phosphates of calcium in tariff item 2835.26.00.

Dibasic Calcium Phosphate Anhydrous (DCPA)

Anhydrous dicalcium phosphate used as a dry binder in tablets and toothpastes. Lacks water of hydration, distinguishing it from the dihydrate form. This product falls under other phosphates of calcium in tariff item 2835.26.00.

Dicalcium Phosphate Dihydrate (DCPD)

Dicalcium phosphate dihydrate is a white, odorless powder composed of calcium hydrogen phosphate with two molecules of water. It is primarily used as a dietary supplement and in toothpaste. This product is classified under other phosphates of calcium in tariff item 2835.26.00.

Feed Grade Calcium Phosphate 21% P

Feed-grade calcium phosphate with 21% phosphorus content for poultry and swine rations. Meets AAFCO specifications for animal feed. This product falls under other phosphates of calcium in tariff item 2835.26.00.

Hydroxyapatite Nanopowder (Synthetic Calcium Phosphate)

Synthetic hydroxyapatite nanopowder mimics bone mineral for coatings, scaffolds, and supplements. It is chemically defined as Ca10(PO4)6(OH)2. This product is classified under other phosphates of calcium in tariff item 2835.26.00.

Monocalcium Phosphate Monohydrate (MCP)

Monocalcium phosphate monohydrate is an acidic calcium phosphate used in baking powders and animal nutrition. It acts as a leavening agent releasing CO2 in baking. This product falls under other phosphates of calcium in tariff item 2835.26.00.

Tetracalcium Phosphate (TTCP) for Biomedical Use

Tetracalcium phosphate is a high-calcium phosphate phase used in bone cements and dental restoratives. It reacts to form hydroxyapatite in vivo. This product is classified under other phosphates of calcium in tariff item 2835.26.00.

Tricalcium Phosphate (TCP) Powder

Tricalcium phosphate is a calcium orthophosphate powder used as a food additive, anticaking agent, and in pharmaceuticals. It provides calcium and phosphorus. This product falls under other phosphates of calcium in tariff item 2835.26.00.

Aluminum Hydrogen Phosphate

Aluminum hydrogen phosphate (Al(H2PO4)3) is an acidic phosphate salt used as a reactive binder in acid-cured refractories and corrosion inhibitors. It is a separate chemically defined compound, which falls under the 'Other' phosphates of tariff item 2835.29.00.

Aluminum Orthophosphate Powder

Aluminum orthophosphate powder (AlPO4) is a thermally stable, chemically defined compound used in ceramic glazes, dental cements, and optical coatings. As a phosphate of aluminum, it is classifiable under the 'Other' phosphates of this tariff item.

Aluminum Phosphate Gel

Aluminum phosphate gel (AlPO4·2H2O) is a colloidal suspension of a chemically defined aluminum phosphate, used as a binder in refractory ceramics and catalyst supports. The gel form is a dispersion of the compound, which remains classifiable under the 'Other' phosphates of this tariff item.

Anhydrous Trisodium Phosphate Powder

Anhydrous trisodium phosphate powder (Na3PO4) is a chemically defined strong base used in metal pretreatment and food processing as an acidity regulator. It falls under the 'Other' phosphates of this tariff item.

Diammonium Phosphate

Diammonium phosphate ((NH4)2HPO4) functions as a fire retardant, yeast nutrient in baking, and pH buffer. As a chemically defined ammonium salt of phosphoric acid, it is classifiable under tariff item 2835.29.00 as an 'other' phosphate.

Disodium Phosphate Anhydrous

Disodium phosphate anhydrous (Na2HPO4) is a sodium salt of phosphoric acid used in dairy processing, pharmaceuticals, and as a pH buffer. It is a chemically defined inorganic compound and is classifiable under tariff item 2835.29.00 as an 'other' phosphate.

Flame Retardant Triammonium Phosphate

Specialty triammonium phosphate optimized for intumescent flame retardant coatings is a chemically defined compound (NH4)3PO4. It falls under the 'Other' phosphates of this tariff item, as it is a phosphate of ammonium.

Food-Grade Aluminum Phosphate

Food-grade aluminum phosphate (E541) is a purified, chemically defined aluminum phosphate used as an emulsifier, stabilizer, and anti-caking agent in processed foods. It is classifiable under the 'Other' phosphates of this tariff item, provided it meets the purity standards for food use.

Food Grade Trisodium Phosphate

Food-grade trisodium phosphate (USP/FCC certified) is a chemically defined inorganic salt of phosphoric acid used as a sequestrant and pH adjuster in processed meats and cereals. It meets the purity standards for food additives and is classifiable under tariff item 2835.29.00 as an 'other' phosphate.

Magnesium Phosphate Tribasic

Magnesium phosphate tribasic (Mg3(PO4)2) is used as a dietary supplement, antacid, and in ceramics production. As a chemically defined inorganic magnesium salt of phosphoric acid, it is classifiable under tariff item 2835.29.00 as an 'other' phosphate.

Microencapsulated Triammonium Phosphate

Microencapsulated triammonium phosphate for controlled release in polymer flame retardants remains a chemically defined compound (NH4)3PO4. The encapsulation does not alter its classification as a phosphate under the 'Other' phosphates of this tariff item.

Monoaluminum Phosphate Solution

Monoaluminum phosphate solution (Al(H2PO4)3 in water) is an acidic phosphate salt used as a binder for high-temperature refractories and acid-resistant coatings. The aqueous solution is a normal method of putting up this compound for safety and transport, so it remains classifiable under the 'Other' phosphates of this tariff item.