Chapter 2836 — Customs Tariff Headings

2836.30.00Sodium hydrogencarbonate (sodium bicarbonate)

2836.40.00Potassium carbonates

2836.50.00Calcium carbonate

2836.60.00Barium carbonate

2836.9Other:

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Products classified under Tariff item 28.36

Anhydrous Soda Ash (Disodium Carbonate)

Anhydrous soda ash is a pure, chemically defined form of disodium carbonate (Na2CO3) used primarily as a flux in glass manufacturing to lower melting temperatures. It meets the criteria of Chapter 28 Note 1(a) as a separate chemically defined compound and is not excluded by any chapter note.

Calcined Soda Ash for Glass Production

Calcined soda ash is thermally processed disodium carbonate optimized for glass production, meeting Chapter 28 Note 1(a) as a chemically defined compound. The calcination process does not alter its chemical identity as Na2CO3, so it remains classified under this tariff item.

Dense Soda Ash (Light Soda Ash Alternative)

Dense soda ash is a high-density granular form of disodium carbonate produced via the Solvay process, used in detergents and chemical synthesis. As a chemically defined compound meeting Chapter 28 Note 1(a), it falls under this tariff item regardless of physical form.

Granular Disodium Carbonate 99.5% Purity

Granular disodium carbonate at 99.5% purity is a chemically defined compound used as a cleaning agent in industrial boilers and textile processing. It meets Chapter 28 Note 1(a) as a separate chemically defined compound, and the granular form does not affect classification.

Sodium Carbonate Monohydrate (Crystal Soda)

Sodium carbonate monohydrate (Na2CO3·H2O) is a hydrated crystalline form of disodium carbonate used in water treatment and as a pH buffer. As a chemically defined compound with water of crystallization, it falls under Chapter 28 Note 1(a) and is not excluded by any note.

Technical Grade Soda Ash 99.2%

Technical grade soda ash with 99.2% Na2CO3 purity is a chemically defined compound used in paper manufacturing and effluent treatment. It meets Chapter 28 Note 1(a) as a separate chemically defined compound, and the technical grade designation does not affect classification.

Trona-Derived Synthetic Soda Ash

Trona-derived synthetic soda ash is processed from natural trona ore into disodium carbonate for soap and paper industries. After processing, it is a chemically defined compound meeting Chapter 28 Note 1(a), and the source material does not affect classification.

USP Grade Disodium Carbonate Anhydrous

USP grade disodium carbonate anhydrous is a pure form of Na2CO3 meeting pharmaceutical standards for use in buffering solutions and as an excipient. It is a chemically defined compound under Chapter 28 Note 1(a), and the USP grade designation does not change its classification.

Animal Feed Grade Sodium Bicarbonate

Animal feed grade sodium bicarbonate is a coarse, free-flowing powder of sodium hydrogencarbonate used to buffer rumen pH in ruminant livestock. It is a separate chemically defined compound of Chapter 28, meeting the criteria of Note 1(a) to the Chapter, and is not put up in measured doses or for retail sale as a medicament.

Baking Soda Industrial Bulk

Industrial bulk sodium bicarbonate is a high-volume, pure sodium hydrogencarbonate powder used in food processing, fire extinguisher charges, and cleaning compounds. As a separate chemically defined inorganic compound, it is classified in Chapter 28, specifically under the carbonate heading, and is not excluded by Chapter Note 3.

Effervescent Base Sodium Bicarbonate

Effervescent base sodium bicarbonate is a granular, pure sodium hydrogencarbonate used as a carbon dioxide source in effervescent tablets and powders. It is a separate chemically defined compound of Chapter 28, and since it is not mixed with other active ingredients, it falls under the carbonate heading.

Fire Extinguisher Grade Sodium Bicarbonate

Fire extinguisher grade sodium bicarbonate is a micronized, pure sodium hydrogencarbonate powder intended for use in ABC dry chemical fire extinguishers. As a separate chemically defined compound, it is classified in Chapter 28, and it is not excluded by Chapter Note 3(e) because it is not put up in fire-extinguishing grenades or charges.

Food Grade Sodium Bicarbonate Powder

Food grade sodium bicarbonate powder is a high-purity sodium hydrogencarbonate used as a leavening agent, pH regulator, and food additive. It is a separate chemically defined compound of Chapter 28, and it is not excluded by Chapter Note 3, as it is not put up for retail sale as a medicament or in measured doses.

Pharmaceutical Sodium Bicarbonate API

Pharmaceutical sodium bicarbonate API is a high-purity sodium hydrogencarbonate meeting pharmacopoeial standards for use in effervescent tablets and injectables. As a separate chemically defined compound, it is classified in Chapter 28, and it is not excluded by Chapter Note 3, as it is not put up in measured doses or for retail sale.

Sodium Bicarbonate for Dialysis

Sodium bicarbonate for dialysis is a sterile, high-purity sodium hydrogencarbonate powder used to prepare hemodialysis buffer solutions. It is a separate chemically defined compound of Chapter 28, and it is not excluded by Chapter Note 3, as it is not put up in measured doses or as a medicament.

Technical Grade Sodium Bicarbonate Crystals

Technical grade sodium bicarbonate crystals are industrial-grade sodium hydrogencarbonate used in water treatment, flue gas desulfurization, and chemical manufacturing. As a separate chemically defined compound, it is classified in Chapter 28, and it is not excluded by Chapter Note 3, as it is not a product of Section V or other excluded goods.

USP Grade Sodium Bicarbonate

USP grade sodium bicarbonate is a pharmaceutical-grade sodium hydrogencarbonate meeting USP standards for use in antacids and buffering agents. It is a separate chemically defined compound of Chapter 28, and it is not excluded by Chapter Note 3, as it is not put up in measured doses or for retail sale.

Water Treatment Sodium Bicarbonate

Water treatment sodium bicarbonate is a pure sodium hydrogencarbonate used for pH adjustment in municipal water treatment and swimming pools. As a separate chemically defined compound, it is classified in Chapter 28, and it is not excluded by Chapter Note 3, as it is not a product of Section V or other excluded goods.

Anhydrous Dipotassium Carbonate 99% Purity

Anhydrous dipotassium carbonate (K2CO3) at 99% purity is a separate chemically defined compound of potassium, falling squarely under tariff item 2836.40.00 for potassium carbonates. It is used as an intermediate in pharmaceutical synthesis and specialty chemical manufacturing. The product meets Chapter 28 Note 1 criteria as a pure inorganic compound, with no organic or excluded constituents.

Bulk Potassium Hydrogencarbonate for Winemaking

Bulk potassium hydrogencarbonate (KHCO3) for winemaking is a separate chemically defined compound used to reduce acidity in wine must. It is a potassium carbonate salt, specifically the bicarbonate form, which falls under tariff item 2836.40.00 for potassium carbonates. The food-grade purity does not affect classification, and it is not excluded by Chapter 28 notes.

Dipotassium Carbonate Calcined Soda Ash

Calcined dipotassium carbonate, produced from potash, is a form of potassium carbonate (K2CO3) obtained by calcination. It serves as an alkaline agent in textile dyeing and wool processing. As a separate chemically defined compound, it is correctly classified under tariff item 2836.40.00 for potassium carbonates, with no organic or excluded components per Chapter 28 notes.

Dipotassium Carbonate for Glass Flux

Dipotassium carbonate used as a glass flux is a high-purity potassium carbonate (K2CO3) that lowers melting points in flat glass production. It is a separate chemically defined compound, meeting Chapter 28 Note 1 requirements. The product is not excluded by any chapter note, and its industrial use does not alter its classification under tariff item 2836.40.00.

Dipotassium Carbonate Monohydrate Crystals

Dipotassium carbonate monohydrate (K2CO3·H2O) is a hydrated form of potassium carbonate, still a separate chemically defined compound. It is used in laboratory reagents and fine chemical synthesis. The water of hydration is inherent to the compound and does not exclude it from Chapter 28, as it is not a solution but a crystalline hydrate, classifiable under tariff item 2836.40.00.

Dipotassium Carbonate Powder (Technical Grade)

Dipotassium carbonate powder (K2CO3), also known as potash carbonate, is a white, hygroscopic powder for industrial applications like glass and soap production. It is a separate chemically defined compound, meeting Chapter 28 Note 1 criteria. The technical grade does not affect classification, and it falls under tariff item 2836.40.00 for potassium carbonates.

Food-Grade Potassium Bicarbonate Powder

Food-grade potassium bicarbonate powder (KHCO3) is a pure, chemically defined compound used as a leavening agent and acidity regulator. It is a potassium carbonate salt, falling under tariff item 2836.40.00. The food-grade status does not alter classification, as it is not put up for retail sale as a food product.

Granular Dipotassium Carbonate 98% Assay

Granular dipotassium carbonate with 98% assay is a physical form of potassium carbonate (K2CO3) used in water softening and chemical synthesis. Granulation does not alter its chemical identity as a separate chemically defined compound. It is correctly classified under tariff item 2836.40.00, as Chapter 28 covers all physical forms of such compounds.

Pharmaceutical Grade Dipotassium Carbonate USP

Pharmaceutical grade dipotassium carbonate meeting USP standards is a high-purity potassium carbonate (K2CO3) for use in effervescent tablets and pH adjustment. It is a separate chemically defined compound, meeting Chapter 28 Note 1 criteria. The pharmaceutical grade does not exclude it from tariff item 2836.40.00, as it is not put up in measured doses or for retail sale.

Pharmaceutical Potassium Bicarbonate API

Pharmaceutical potassium bicarbonate API (KHCO3) is a pure, chemically defined compound for effervescent tablet production. It is a potassium carbonate salt, classifiable under tariff item 2836.40.00. As an API, it is not put up in measured doses or for retail sale, so it remains in Chapter 28.

Potassium Bicarbonate Agricultural Soil Amendment

Potassium bicarbonate for agricultural soil amendment is a technical-grade potassium hydrogencarbonate (KHCO3) used for pH correction and potassium supplementation. It is a separate chemically defined compound, classifiable under tariff item 2836.40.00. It is not excluded by Chapter 28 notes, as it is not a fertilizer of Chapter 31.

Potassium Bicarbonate Dechlorination Agent

Potassium bicarbonate for dechlorination is a powdered potassium hydrogencarbonate (KHCO3) used to remove chlorine from water. It is a separate chemically defined compound, classifiable under tariff item 2836.40.00. The application does not affect classification, as it is not a preparation or mixture.

Potassium Bicarbonate for Fire Extinguisher Charges

Potassium bicarbonate for fire extinguisher charges is a dry chemical powder (KHCO3) formulated for ABC fire extinguishers. It is a separate chemically defined compound, classifiable under tariff item 2836.40.00. Chapter 28 Note 3(e) excludes products put up as charges for fire-extinguishers, but this product is the pure compound, not a charge, so it remains in this heading.

Potassium Bicarbonate for Swimming Pool pH Balancer

Granular potassium bicarbonate for swimming pool pH balancing is a pure potassium hydrogencarbonate (KHCO3) used to raise alkalinity. It is a separate chemically defined compound, classifiable under tariff item 2836.40.00. The granular form and pool application do not alter classification, as it is not a prepared mixture.

Potassium Bicarbonate USP Grade

Potassium bicarbonate USP grade is a pharmaceutical-grade potassium hydrogencarbonate (KHCO3) used as an antacid. It is a separate chemically defined compound, classifiable under tariff item 2836.40.00. As a pure compound not put up in measured doses, it remains in Chapter 28.

Pure Potassium Bicarbonate Lab Reagent

Pure Potassium Bicarbonate Lab Reagent is ACS-grade potassium hydrogencarbonate (KHCO3), a chemically defined compound used in analytical chemistry as a buffer and carbon dioxide source. It falls under tariff item 2836.40.00 as a potassium carbonate salt, meeting Chapter 28 note 1 criteria for separate chemically defined compounds. Supplied in 1 kg laboratory packs, it is classifiable here regardless of purity or packaging.

Technical Grade Potassium Bicarbonate Crystals

Technical Grade Potassium Bicarbonate Crystals are industrial-grade potassium hydrogencarbonate (KHCO3) used in water treatment to adjust pH and precipitate calcium. As a chemically defined potassium carbonate salt, it is classified under tariff item 2836.40.00 per Chapter 28 note 1, even with minor impurities typical of technical grade. The product is supplied in bulk crystal form for industrial applications.

Calcite Powder Precipitated Grade

Synthetic calcite powder produced by a carbonation process, chemically equivalent to natural calcite but with higher purity. It is a separate chemically defined compound of calcium carbonate, meeting the requirements of Chapter 28 Note 1(a). Applications include toothpaste abrasives and optical coatings.

Calcium Carbonate for Animal Feed

Coarse calcium carbonate powder (200-400 mesh) fortified for use as a calcium source in poultry and livestock feed. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a), and is not excluded by Chapter 28 Note 3. It meets AAFCO nutritional specifications for animal feed.

Calcium Carbonate Precipitate for Toothpaste

Precipitated calcium carbonate with a controlled abrasivity index for use in premium toothpaste formulations. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Provides cleaning action without excessive enamel wear.

Coated Calcium Carbonate Stearic Acid

Calcium carbonate particles surface-treated with stearic acid to impart hydrophobic properties, with the coating comprising less than 5% of the total weight. The coating is a stabilizer or processing aid that does not render the product particularly suitable for a specific use, so it remains classified as calcium carbonate under Chapter 28 Note 1(e). Used in polyolefin films and sheets.

Dry Ground Marble Calcium Carbonate

Micronized calcium carbonate derived from Italian Carrara marble via dry grinding, valued for its chemical purity. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Used as a premium filler in adhesives and sealants.

Food Grade Calcium Carbonate E170

Food grade calcium carbonate (E170) used as an acidity regulator, anticaking agent, and calcium source in food products. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a), and is not excluded by Chapter 28 Note 3. Meets FCC standards for direct food contact applications.

Ground Calcium Carbonate (GCC) Powder

Ground calcium carbonate (GCC) powder derived from high-purity limestone, micronized to a fine powder. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Used in pharmaceuticals and food supplements as a calcium source.

Heavy Calcium Carbonate 1250 Mesh

Ultra-fine heavy calcium carbonate (D97<4.5μm) produced by grinding marble, used as an industrial filler. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Applications include PVC pipes, masterbatches, and powder coatings.

High Purity Synthetic Calcium Carbonate

High purity synthetic calcium carbonate (99.9% pure) produced via controlled precipitation for electronic ceramics and high-voltage insulators. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Ultra-low impurity levels are critical for dielectric properties.

Nano Calcium Carbonate

Nano-sized calcium carbonate particles (1-100 nm) produced via precipitation for high-performance applications. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Used in tire rubber reinforcement, coatings, and adhesives.

Optical Grade Calcium Carbonate

High-purity, low-birefringence calcium carbonate crystals used for optical polishing compounds and lens manufacturing aids. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Synthetic single crystals are available.

Pharmaceutical Grade Calcium Carbonate USP

USP-grade calcium carbonate meeting pharmacopeia standards for purity and microbial limits. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Used as a primary ingredient in antacids and calcium supplements.

Precipitated Calcium Carbonate (PCC)

Precipitated calcium carbonate (PCC) produced by chemical precipitation from calcium hydroxide and carbon dioxide. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Widely used as a filler and pigment in various applications.

Ultrawhite Calcium Carbonate 2.5 Micron

High-brightness (98%+) calcium carbonate with a controlled 2.5 micron particle size distribution for premium paper coatings. It is a separate chemically defined compound of calcium carbonate, meeting Chapter 28 Note 1(a). Provides gloss and opacity in inkjet media.

Barium Carbonate 325 Mesh Powder

Ultra-fine 325 mesh barium carbonate powder used as a flux in pyrotechnic compositions to produce green flames. This chemically defined inorganic carbonate falls under tariff item 2836.60.00 as barium carbonate, meeting the purity and form requirements of Chapter 28.

Barium Carbonate Dense Soda Ash Blend

A blend of barium carbonate with dense soda ash used as a flux in glass batch preparation. The principal component is barium carbonate, and the product is classifiable under this tariff item as barium carbonate, provided the soda ash is incidental and does not alter the essential character.

Barium Carbonate Fine Crystals

Fine crystalline barium carbonate used as a flux in brick and tile production to lower melting points. This is a chemically defined inorganic compound of barium, classifiable under tariff item 2836.60.00 as barium carbonate.

Barium Carbonate for Porcelain Enamel

Barium carbonate used in porcelain enamel coatings for appliances, providing barium oxide fluxing properties during firing. This simple inorganic carbonate of barium is covered by tariff item 2836.60.00, as it is not excluded by Chapter 28 notes.

Barium Carbonate Powder (Technical Grade)

Technical grade barium carbonate powder, a white, odorless inorganic salt used in ceramics for glazing and frit production. It falls under tariff item 2836.60.00 as a chemically defined barium carbonate, meeting Chapter 28 requirements for separate chemically defined compounds.

Calcined Barium Carbonate Granules

Calcined granules of barium carbonate providing controlled release in metallurgical flux applications for steel production. Thermal treatment does not alter the chemical definition, so it remains classifiable under tariff item 2836.60.00 as barium carbonate.

High-Purity Barium Carbonate for Optical Glass

Ultra-high purity barium carbonate (>99.9%) essential for manufacturing high-refractive index optical glass like barium flint. This pure inorganic carbonate is classifiable under tariff item 2836.60.00, per Note 1 to Chapter 28.

Industrial Barium Carbonate for Rat Poison Bait

Barium carbonate formulated for rodenticide baits, a chemically defined inorganic salt toxic to mammals. It remains a simple barium carbonate, not an organo-inorganic compound, so it falls under tariff item 2836.60.00.

Precipitated Barium Carbonate (99% Purity)

Precipitated barium carbonate at 99% purity, a fine, high-quality powder produced via chemical precipitation for specialty glass manufacturing. It is a pure, chemically defined compound classifiable under tariff item 2836.60.00.