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HSChapter 28
U.S. exports of calcium carbonate (HS 283650) totaled $3.6M in July 2026.
Importers of Calcium Carbonate paid $212K in duties in July 2026 — an effective duty rate of 12% on $1.8M in dutiable value, based on actual customs collections rather than the published tariff schedule. Calcium Carbonate imports of $2.5M in July 2026 ran 12% below the year-to-date monthly average of $2.9M.
Last updated: July 2026 dataCalcium carbonate is one of the most widely traded inorganic minerals in global commerce, serving as a filler and coating pigment in paper and plastics, a dietary calcium supplement, an antacid active ingredient, and a construction material additive. Vietnam has emerged as the leading US import source under tariff line 2836500000, driven by its abundant limestone reserves and competitive processing costs, with Canada and Japan also supplying significant volumes. Particle size, surface treatment (coated vs. uncoated), and purity grade are the key specification variables that determine end-use suitability and pricing — distinctions that are not captured by the single HTS line. Food-grade and pharmaceutical-grade calcium carbonate are subject to FDA admissibility review.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
261 shipments/mo
Both ground calcium carbonate (mechanically milled from limestone or marble) and precipitated calcium carbonate (chemically synthesized for controlled particle size and morphology) are classified under 2836500000 — the HTS does not distinguish between them. However, PCC commands a significant price premium due to its controlled particle size distribution and surface area, and buyers should specify GCC or PCC clearly on purchase orders and invoices to ensure the correct product is shipped and to support any downstream quality or regulatory documentation.
Calcium carbonate used as a dietary supplement ingredient or antacid active pharmaceutical ingredient is subject to FDA admissibility review, including evaluation of purity, heavy-metal limits, and compliance with USP or food-chemical codex monographs. Importers should obtain certificates of analysis from the foreign manufacturer and ensure the product meets applicable FDA specifications before shipment. Classification and admissibility are complex; consult a licensed customs broker or FDA-registered agent to confirm the correct regulatory pathway.
Subheading 3 of 8 in heading 2836
Subheading 283650 · $2.5M of $36.3M
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ImportsExports
Imports
$2.5MYoY · Pro
Exports
$3.6MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2836500000 | Calcium Carbonate | $2.5M | 8.37% | 70.26% | $212K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2836500000 | Calcium Carbonate | $3.6M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · July 2026
destination
Canada and Mexico together take 62% of it.
customs district
origin
entry
rate provision · imports
29.2% enters free of duty; the effective duty rate is 8.37%.