U.S. imports of Chalk (Crude Natural Calcium Carbonate) (SITC 27891) totaled $89K in August 2026, imported from 12 countries.
Importers of Chalk (Crude Natural Calcium Carbonate) paid $17K in duties in August 2026, an average duty rate of 29.93% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Chalk (Crude Natural Calcium Carbonate) imports of $89K in August 2026 ran 21% below the year-to-date monthly average of $112K.
Last updated: August 2026 dataSoft, fine-grained natural calcium carbonate in its crude chalk form is used as a mild abrasive, filler, and soil conditioner, and is distinguished in trade from precipitated or ground calcium carbonate by its natural, unprocessed origin. The material's low hardness and high whiteness make it suitable for applications in rubber compounding, paper coating, and agricultural lime, though processed calcium carbonate products command higher prices and fall under separate chemical headings. Importers should confirm that the material has not been calcined or chemically purified, as those steps shift classification to processed carbonate or quicklime headings.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
23 import shipments a month
Crude chalk is natural calcium carbonate in its raw, unprocessed state — typically soft, porous, and variable in purity. Ground calcium carbonate is mechanically processed to precise particle sizes and brightness specifications for industrial use. The two fall under different tariff headings, and GCC commands a significant price premium due to its controlled particle-size distribution.
Calcination converts calcium carbonate to calcium oxide (quicklime) or, with partial calcination, to a mixed product. Either outcome shifts the material out of this heading into the lime and calcined mineral headings, which carry different duty treatment. Importers should request thermal processing records from suppliers to confirm the material remains in its natural carbonate form.
Basic heading 177 of 239 in section 2
Basic heading 27891 · $89K of $3.8B
Imports · August 2026
origin
China and Vietnam together supply 79% of it. Brazil pays 37.5% duty; Canada 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$89KYoY · free account
Exports
$100KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.4M of Chalk (Crude Natural Calcium Carbonate) and exported $719K.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026. Source: U.S. Census Bureau.
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