Calcium carbonate
Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate. > Calcium carbonate > Calcium carbonate
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Subheadings
Products classified under Tariff item 2836.50.00
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.